Waterborn polymer-modified emulsified asphalt mixture and process for producing the same

Abstract

This present invention discloses a waterborne polymer modified emulsified asphalt mixture and the preparation method thereof, and particularly relates to a waterborne polyurethane emulsified asphalt concrete, a waterborne acrylic resin emulsified asphalt concrete, and a waterborne epoxy resin emulsified asphalt micro-surfacing mixture, and preparation methods thereof. A mixture containing a waterborne polymer modified emulsified asphalt forms a high-performance composite system having a spatial network structure, and has good performance and simple preparation process.

Claims

1. A waterborne epoxy resin emulsified asphalt micro-surfacing mixture, wherein the waterborne epoxy resin emulsified asphalt micro-surfacing mixture, wherein the waterborne epoxy resin emulsified asphalt micro-surfacing mixture comprises raw materials having the ratio of parts by weight as follows: TABLE-US-00016 a mineral aggregate 100 an anionic emulsified asphalt 10-15 a waterborne epoxy resin emulsion 0.5-12 water .sup.6-11, wherein the micro-surfacing mixture is produced by a method comprising the steps as follows: 1a) preparing the mineral aggregate suitable for mixing; 2a) mixing the waterborne epoxy resin emulsion and the emulsified asphalt, and uniformly stirring to obtain a water epoxy resin emulsified asphalt for stand-by; 3a) adding water to the prepared mineral aggregate, and sufficiently stirring to wet the mineral aggregate; and 4a) adding the waterborne epoxy resin modified emulsified asphalt to the wetted mineral aggregate, uniformly stirring, and curing, so as to obtain the micro-surfacing mixture; wherein the time of stirring in step 4a) is 30 s-180 s; or 1b) preparing the mineral aggregate suitable for mixing; 2b) adding water to the prepared mineral aggregate, and sufficiently stirring to wet the mineral aggregate; 3b) adding the waterborne epoxy resin emulsion and the emulsified asphalt to the wetted mineral aggregate, uniformly stirring, and curing, so as to obtain a micro-surfacing mixture; wherein the time of stirring in step 3b) is 30 s-180 s, wherein the weight ratio of the mineral aggregate suitable for mixing, the waterborne epoxy resin emulsion, the emulsified asphalt and the water is 100:0.5-12:10-15:6-11.

2. The micro-surfacing mixture as claimed in claim 1, wherein the mixture further comprises an additive, and the weight ratio of the mineral aggregate to the additive is 100:1-3, and/or the mineral aggregate is composed of a crude aggregate, a fine aggregate, and a filler; wherein the weight ratio of the crude aggregate, the fine aggregate, and the filler is 10-30:55-85:5-15; the crude aggregate has a nominal particle size of 4.75 mm<; the fine aggregate has a nominal particle size of 4.75 mm; the filler has a nominal particle size of 0.075 mm, and/or the waterborne epoxy resin emulsion comprises a waterborne epoxy resin and a waterborne epoxy curing agent, wherein the weight ratio of the waterborne epoxy resin to the waterborne epoxy curing agent is 1:1-2.

3. The micro-surfacing mixture as claimed in claim 2, wherein the waterborne epoxy resin is a water-soluble epoxy resin or a standard liquid resin having a solid content of 50-100%; and/or the waterborne epoxy curing agent is a curing agent emulsion having a solid content of 30-70%, wherein the curing agent emulsion comprises polyamine or polyamide.

4. The micro-surfacing mixture as claimed in claim 1, wherein the mineral aggregate suitable for mixing of step 1a) and/or 1b) is prepared by adding an additive after mixing a crude aggregate, a fine aggregate and a filler, and/or the waterborne epoxy resin emulsion of step 2a) and/or 3b) is formed by mixing and stirring a waterborne epoxy resin and a waterborne epoxy curing agent with a stirring time of 5-10 min; wherein the weight ratio of the waterborne epoxy resin and the waterborne epoxy resin and the waterborne epoxy curing agent is 1: 1-2.

Description

DESCRIPTION OF EMBODIMENTS

(1) This present invention will be further described below in conjunction with specific examples, and the advantages and features of this invention will be clearer with description. However, these examples are merely exemplary and will in no way limit the scope of this invention. It is to be understood the person skilled in the art that amendments or replacements may be performed on details and forms of the technical solutions of this present invention without departing from the spirit and scope of this invention, and all of these amendments and replacements fall in the scope of this invention.

Example I-1

(2) Preparation of Emulsified Asphalt

(3) Materials were prepared according to the following weight proportion:

(4) TABLE-US-00002 Asphalt 110 g water 90 g dodecyl sodium sulfonate 4 g

(5) Water and dodecyl sodium sulfonate were mixed and stirred at 60 C. and were sufficiently dissolved to obtain a uniform emulsion, pH of the emulsion was controlled at 12 by using a sodium hydroxide buffer; an asphalt was heated to 140 C. and poured into the prepared uniform emulsion for emulsification with an emulsification time of 4 min; and the prepared emulsified asphalt had a solid content of 54%.

(6) 2) Preparation of Waterborne Polyurethane Emulsified Asphalt Concrete

(7) 100 g of the emulsified asphalt and 40 g of a waterborne polyurethane emulsion were mixed and sufficiently stirred by using a low-speed stirrer for 5 min to prepare a uniform nonviscous brown mixture, which was a waterborne polyurethane emulsification asphalt emulsion.

(8) The waterborne polyurethane emulsification asphalt emulsion was placed in a mixing pot, 1000 g of a mineral aggregate was added, stirring was performed at normal temperature for 140 s, and curing was performed to obtain a waterborne polyurethane emulsified asphalt concrete.

(9) In the above, the mineral aggregate was basalt; the mineral aggregate was composed of a crude aggregate, a fine aggregate, and a filler, the weight ratio of the crude aggregate, the fine aggregate, and the filler was 60:40:8, the crude aggregate had a nominal particle size of >4.75 mm, the fine aggregate had a nominal particle size of 4.75 mm, the filler had a nominal particle size of 0.075 mm.

(10) In the above, the waterborne polyurethane emulsion was a commercially available linear molecule type waterborne polyurethane emulsion having a solid content of 55%.

Example I-2

(11) 1) Preparation of Emulsified Asphalt

(12) Materials were prepared according to the following weight proportion:

(13) TABLE-US-00003 Asphalt 160 g water 50 g octylphenol polyoxyethylene ether 2 g

(14) Water and octylphenol polyoxyethylene ether were mixed and stirred at 55 C., and were sufficiently dissolved to obtain a uniform emulsion; an asphalt was heated to 120 C. and poured into the prepared uniform emulsion for emulsification with an emulsification time of 5 min; and the prepared emulsified asphalt had a solid content of 75%.

(15) 2) Preparation of Waterborne Polyurethane Emulsified Asphalt Concrete

(16) 200 g of the nonionic emulsified asphalt and 10 g of a waterborne polyurethane emulsion were mixed and sufficiently stirred by using a low-speed stirrer for 10 min to prepare a uniform nonviscous brown mixture, which was a waterborne polyurethane emulsification asphalt emulsion.

(17) The waterborne polyurethane emulsification asphalt emulsion was placed in a mixing pot, 1000 g of a mineral aggregate was added, stirring was performed at normal temperature for 300 s, and curing was performed to obtain a waterborne polyurethane emulsified asphalt concrete.

(18) In the above, the mineral aggregate was basalt; the aggregate was composed of a crude aggregate, a fine aggregate, and a filler, the weight ratio of the crude aggregate, the fine aggregate, and the filler was 50:50:10, the crude aggregate had a nominal particle size of >4.75 mm, the fine aggregate had a nominal particle size of 4.75 mm, the filler had a nominal particle size of 0.075 mm.

(19) In the above, the waterborne polyurethane emulsion was a commercially available crosslinking type waterborne polyurethane emulsion having a solid content of 70%.

Example I-3

(20) 1) Preparation of Emulsified Asphalt

(21) Materials were prepared according to the following weight proportion:

(22) TABLE-US-00004 Asphalt 40 g Water 60 g Cetyltrimethylammonium chloride 1 g

(23) Water and cetyltrimethylammonium chloride were mixed and stirred at 65 C. and were sufficiently dissolved to obtain a uniform emulsion, pH of the emulsion was controlled at 3 by using a hydrochloric acid buffer; an asphalt was heated to 160 C.; the heated asphalt was poured into the prepared emulsion for emulsification with an emulsification time of 3 min; and the prepared emulsified asphalt had a solid content of 40%.

(24) 2) Preparation of Waterborne Polyurethane Emulsified Asphalt Concrete

(25) 70 g of the cationic emulsified asphalt and 200 g of a waterborne polyurethane emulsion were mixed and sufficiently stirred by using a low-speed stirrer for 2 min to prepare a uniform nonviscous brown mixture, which was a waterborne polyurethane emulsification asphalt emulsion.

(26) The waterborne polyurethane emulsification asphalt emulsion was placed in a mixing pot, 1000 g of a mineral aggregate was added, stirring was performed at normal temperature for 60 s, and curing was performed to obtain a waterborne polyurethane emulsified asphalt concrete.

(27) In the above, the mineral aggregate was limestone; the mineral aggregate was composed of a crude aggregate, a fine aggregate, and a filler, the weight ratio of the crude aggregate, the fine aggregate, and the filler was 70:30:5, the crude aggregate had a nominal particle size of >4.75 mm, the fine aggregate had a nominal particle size of 4.75 mm, the filler had a nominal particle size of 0.075 mm.

(28) In the above, the waterborne polyurethane emulsion was a commercially available linear molecule type waterborne polyurethane emulsion having a solid content of 40%.

Example I-4

(29) 1) Preparation of Emulsified Asphalt

(30) Materials were prepared according to the following weight proportion:

(31) TABLE-US-00005 Asphalt 60 g water 45 g sodium dibutylnaphthalenesulfonate 3 g

(32) Water and sodium dibutylnaphthalenesulfonate were mixed and stirred at 60 C. and were sufficiently dissolved to obtain a uniform emulsion, pH of the emulsion was controlled at 12 by using a sodium hydroxide buffer; an asphalt was heated to 150 C. and poured into the prepared emulsion for emulsification with an emulsification time of 2 min; and the prepared emulsified asphalt had a solid content of 47%.

(33) 2) Preparation of Waterborne Polyurethane Emulsified Asphalt Concrete

(34) 1000 g of a mineral aggregate, 70 g of a cationic emulsified asphalt, and 10 g of a waterborne polyurethane emulsion were placed in a mixing pot, stirred at normal temperature for 30 s, and cured to obtain a waterborne polyurethane emulsified asphalt concrete;

(35) wherein the mineral aggregate was limestone; the aggregate was composed of a crude aggregate, a fine aggregate, and a filler, the weight ratio of the crude aggregate, the fine aggregate, and the filler was 50:30:5, the crude aggregate had a nominal particle size of >4.75 mm, the fine aggregate had a nominal particle size of 4.75 mm, the filler had a nominal particle size of 0.075 mm.

(36) In the above, the waterborne polyurethane emulsion was a commercially available linear molecule type waterborne polyurethane emulsion having a solid content of 50%.

Example I-5

(37) 1) Preparation of Emulsified Asphalt

(38) Materials were prepared according to the following weight proportion:

(39) TABLE-US-00006 Asphalt 130 g water 100 g dodecyl sodium sulfate 3 g octylphenol polyoxyethylene ether 3 g

(40) Water, dodecyl sodium sulfate and octylphenol polyoxyethylene ether were mixed and stirred at 60 C. and were sufficiently dissolved to obtain a uniform emulsion, pH of the emulsion was controlled at 12 by using a sodium hydroxide buffer; an asphalt was heated to 145 C. and poured into the prepared uniform emulsion for emulsification with an emulsification time of 4 min; and the prepared emulsified asphalt had a solid content of 55%.

(41) 2) Preparation of Waterborne Polyurethane Emulsified Asphalt Concrete

(42) 1000 g of a mineral aggregate, 200 g of a cationic emulsified asphalt, and 200 g of a waterborne polyurethane emulsion were placed in a mixing pot, stirred at normal temperature for 300 s, and cured to obtain a waterborne polyurethane emulsified asphalt concrete;

(43) wherein the mineral aggregate was limestone; the aggregate was composed of a crude aggregate, a fine aggregate, and a filler, the weight ratio of the crude aggregate, the fine aggregate, and the filler was 70:50:10, the crude aggregate had a nominal particle size of >4.75 mm, the fine aggregate had a nominal particle size of 4.75 mm, the filler had a nominal particle size of 0.075 mm.

(44) In the above, the waterborne polyurethane emulsion was a commercially available crosslinking type waterborne polyurethane emulsion having a solid content of 60%.

Comparative Example I-1

(45) An emulsified asphalt was prepared according to the method of Example I-1. 150 g of this asphalt was placed in a mixing pot, 1000 g of a mineral aggregate was added, stirring was performed at normal temperature for 140 s, and curing was performed to obtain a cold-mixed emulsified asphalt concrete.

(46) In the above, the mineral aggregate was basalt; the mineral aggregate was composed of a crude aggregate, a fine aggregate, and a filler, the weight ratio of the crude aggregate, the fine aggregate, and the filler was 50:50:10, the crude aggregate had a nominal particle size of >4.75 mm, the fine aggregate had a nominal particle size of 4.75 mm, the filler had a nominal particle size of 0.075 mm.

Comparative Example I-2

(47) 69 g of an asphalt was heated to 165 C. and was added to 1000 g of an aggregate at 175 C., and mixing was performed at 170 C. to obtain a hot-mixed asphalt concrete.

(48) In the above, the mineral aggregate was basalt; the aggregate was composed of a crude aggregate, a fine aggregate, and a filler, the weight ratio of the crude aggregate, the fine aggregate, and the filler was 50:50:10, the crude aggregate had a nominal particle size of >4.75 mm, the fine aggregate had a nominal particle size of 4.75 mm, the filler had a nominal particle size of 0.075 mm.

Test Example I-1

(49) The waterborne polyurethane emulsified asphalt concretes prepared in Examples I-1 to I-5 and the emulsified asphalt concretes prepared in Comparative Examples I-1 and I-2 were molded into test pieces according to the specification Standard Test Methods of Bitumen and Bituminous Mixture for Highway Engineering (JTG E20-2011), were cured, and the Marshall performance test was performed. The test results are as shown in Table 1.

(50) TABLE-US-00007 TABLE 1 Results of Marshall Performance Test Technical Comparative Comparative Example Example Example Example Example requirements Example I-1 Example I-2 I-1 I-2 I-3 I-4 I-5 Stability kN 8 3.67 9.94 19.08 11.09 17.91 7.83 28.04 Dynamic 800 1034.8 2145 48461.5 21000 24230.8 5218.3 64250.9 stability (time/mm) Maximal 2000 2515.9 6339.7 4488.8 4994.2 2085 8503.1 flexural strain () Cleavage 70 70% 86% 97% 95% 92% 75% 98% strength percentage Note: technical requirements are on the basis of Standard Test Methods of Bitumen and Bituminous Mixture for Highway Engineering (JTG E20-2011) T0709

(51) It can be seen from Table 1 that the cold-mixed emulsified asphalt concrete prepared in Comparative Example I-1 has poor stability, none of indices thereof reaches the technical requirements, and can not be used for road pavement; upon the modification action of the waterborne polyurethane, both the stability and the dynamic stability of the waterborne polyurethane emulsified asphalt concretes prepared in Examples I-1 to I-5 are improved to 2 times more than those of the Comparative Example I-1 or more, demonstrating that the stability at high temperature is significantly superior to that of Comparative Example I-1; furthermore, since the molded rut board of the normal asphalt mixture in Comparative Example I-1 has poor mechanical strength and fails to be cut into qualified trabecular test pieces, the maximal flexural strain thereof can not be measured, while the waterborne polyurethane emulsified asphalt concretes prepared in Examples I-1 to I-5 have a maximal flexural strain up to 2000 or more, which satisfies the technical requirements for asphalt mixtures for pavement; and the cleavage strengths of Examples I-1 to I-5 are significantly higher than those of Comparative Example I-1 and the technical requirements, thereby demonstrating that the waterborne polyurethane emulsified asphalt concrete prepared in this present invention has better water stability.

(52) Comparative Example I-2 is a conventional hot-mixed asphalt concrete, and it can be known from Table 1 that all indices of the waterborne polyurethane emulsified asphalt concrete of this invention are close to or even beyond those of a hot-mixed asphalt concrete.

(53) In summary, the waterborne polyurethane emulsified asphalt concrete prepared in this present invention has high strength as well as good mechanical properties and stability, and achieves the technical effects of a hot-mixed asphalt concrete by using a process of cold mixing due to the modification action of the waterborne polyurethane. It is a road surface material having excellent pavement performance, and may be widely used in the preparation of asphalt concrete pavement materials, asphalt road surface repair materials, slurry seals for curing, micro-surfacing, asphalt mortar for high-speed railways, etc.

Example II-1

(54) 2 g of dodecyl sodium sulfate was weighed and added to 50 g of deionized water, they were uniformly stirred at a speed of 1000/min, and dodecyl sodium sulfate was dissolved in water to prepare a soap liquid.

(55) 45 g of a mixture of acrylic acid and n-butyl acrylate was weighed and dropwise added to the soap liquid, 0.5 g of ammonium persulfate was weighed and added to the soap liquid in batches after dissolved with a small amount of deionized water, they were stirred at a speed of 1000/min for 3 min, and the mixed liquid was kept at a temperature of 75 C.

(56) After the dropwise addition of the monomers was complete, stirring was continued for 20 min to obtain a white viscous liquid, and pH of the mixed liquid was adjusted to 11 by using a 1% sodium hydroxide solution.

(57) 60 g of an asphalt was weighed and slowly added to the above white viscous liquid after heated to 150 C., and was stirred at a speed of 2500/min for 3 min to obtain a waterborne acrylic resin modified emulsified asphalt.

(58) 200 g of the prepared waterborne acrylic resin modified emulsified asphalt was weighed and placed in a mixing pot, 1000 g of a mineral aggregate was added, they were stirred at normal temperature for 150 s to obtain a waterborne acrylic resin emulsified asphalt concrete.

(59) In the above, the mineral aggregate was basalt; the mineral aggregate was composed of a crude aggregate, a fine aggregate, and a filler, the weight ratio of the crude aggregate, the fine aggregate, and the filler was 50:60:7, the crude aggregate had a nominal particle size of >4.75 mm, the fine aggregate had a nominal particle size of 4.75 mm, the filler had a nominal particle size of 0.075 mm.

Example II-2

(60) 3 g of dodecyl sodium sulfonate was weighed and added to 70 g of deionized water, they were uniformly stirred at a speed of 500/min, and were dissolved in water to prepare an emulsion.

(61) 30 g of a mixture of methyl methacrylate and ethyl methacrylate was weighed and dropwise added to the emulsion, 0.7 g of potassium persulfate was weighed and added to the emulsion in batches after dissolved with a small amount of deionized water, they were stirred at a speed of 500/min for 2 min, and the mixed liquid was kept at a temperature of 65 C.

(62) After the dropwise addition of the monomers was complete, stirring was continued for 30 min to obtain a white viscous liquid, and pH of the mixed liquid was adjusted to 12 by using a 1% sodium hydroxide solution.

(63) 80 g of an asphalt was weighed and slowly added to the above white viscous liquid after heated to 100 C., and was stirred at a speed of 3000/min for 3 min to obtain a waterborne acrylic resin modified emulsified asphalt.

(64) 400 g of the prepared waterborne acrylic resin modified emulsified asphalt was weighed and placed in a mixing pot, 1000 g of a mineral aggregate was added, they were stirred at normal temperature for 300 s to obtain a waterborne acrylic resin emulsified asphalt concrete.

(65) In the above, the mineral aggregate was basalt; the mineral aggregate was composed of a crude aggregate, a fine aggregate, and a filler, the weight ratio of the crude aggregate, the fine aggregate, and the filler was 30:50:6, the crude aggregate had a nominal particle size of >4.75 mm, the fine aggregate had a nominal particle size of 4.75 mm, the filler had a nominal particle size of 0.075 mm.

Example II-3

(66) 1 g of dodecyl sodium benzene sulfonate was weighed and added to 40 g of deionized water, they were uniformly stirred at a speed of 750/min, and dodecyl sodium benzene sulfonate was dissolved in water to prepare an emulsion.

(67) 60 g of a mixture of acrylic acid, lauryl acrylate and acrylamide was weighed and dropwise added to the emulsion, 0.3 g of sodium persulfate was weighed and added to the emulsion in batches after dissolved with a small amount of deionized water, they were stirred at a speed of 750/min for 5 min, and the mixed liquid was kept at a temperature of 85 C.

(68) After the dropwise addition of the monomers was complete, stirring was continued for 10 min to obtain a white viscous liquid, and pH of the mixed liquid was adjusted to 10 by using a 1% sodium hydroxide solution.

(69) 40 g of an asphalt was weighed and slowly added to the above white viscous liquid after heated to 170 C., and was stirred at a speed of 1000/min for 3 min to obtain a waterborne acrylic resin modified emulsified asphalt.

(70) 50 g of the prepared waterborne acrylic resin modified emulsified asphalt was weighed and placed in a mixing pot, 1000 g of a mineral aggregate was added, they were stirred at normal temperature for 30 s to obtain a waterborne acrylic resin emulsified asphalt concrete.

(71) In the above, the mineral aggregate was basalt; the mineral aggregate was composed of a crude aggregate, a fine aggregate, and a filler, the weight ratio of the crude aggregate, the fine aggregate, and the filler was 70:40:10, the crude aggregate had a nominal particle size of >4.75 mm, the fine aggregate had a nominal particle size of 4.75 mm, the filler had a nominal particle size of 0.075 mm.

Example II-4

(72) 3 g of dodecyl sodium benzene sulfonate was weighed and added to 60 g of deionized water, they were uniformly stirred at a temperature of 70 C., and dodecyl sodium benzene sulfonate was dissolved in water to prepare an emulsion; pH of the emulsion was adjusted to 12 by using a 1% sodium hydroxide solution; and 40 g of an asphalt was weighed and slowly added to the above emulsion after heated to 170 C., and emulsification was performed for 5 min to obtain an emulsified asphalt.

(73) 40 g of the emulsified asphalt, 200 g of a waterborne acrylic resin emulsion, and 1000 g of a mineral aggregate were mixed and stirred at normal temperature for 30 s to obtain a waterborne acrylic resin emulsified asphalt concrete.

(74) In the above, the mineral aggregate was basalt; the mineral aggregate was composed of a crude aggregate, a fine aggregate, and a filler, the weight ratio of the crude aggregate, the fine aggregate, and the filler was 60:30:9, the crude aggregate had a nominal particle size of >4.75 mm, the fine aggregate had a nominal particle size of 4.75 mm, the filler had a nominal particle size of 0.075 mm; the waterborne acrylic resin emulsion was a commercially available linear molecule type waterborne acrylic resin emulsion having a solid content of 30%.

Example II-5

(75) 1 g of dodecyl sodium sulfonate was weighed and added to 25 g of deionized water, they were uniformly stirred at a temperature of 30 C., and dodecyl sodium sulfonate was dissolved in water to prepare an emulsion; pH of the emulsion was adjusted to 10 by using a 1% sodium hydroxide solution; and 80 g of an asphalt was weighed and slowly added to the above emulsion after heated to 100 C., and emulsification was performed for 2 min to obtain an emulsified asphalt.

(76) 200 g of the emulsified asphalt, 10 g of a waterborne acrylic resin emulsion, and 1000 g of a mineral aggregate were mixed and stirred at normal temperature for 300 s to obtain a waterborne acrylic resin emulsified asphalt concrete.

(77) In the above, the mineral aggregate was basalt; the mineral aggregate was composed of a crude aggregate, a fine aggregate, and a filler, the weight ratio of the crude aggregate, the fine aggregate, and the filler was 40:70:5, the crude aggregate had a nominal particle size of >4.75 mm, the fine aggregate had a nominal particle size of 4.75 mm, the filler had a nominal particle size of 0.075 mm; the waterborne acrylic resin emulsion was a commercially available linear molecule type waterborne acrylic resin emulsion having a solid content of 70%.

Example II-6

(78) 2 g of dodecyl sodium sulfate was weighed and added to 40 g of deionized water, they were uniformly stirred at a temperature of 50 C., and dodecyl sodium sulfate was dissolved in water to prepare an emulsion; pH of the emulsion was adjusted to 11 by using a 1% sodium hydroxide solution; and 60 g of an asphalt was weighed and slowly added to the above emulsion after heated to 140 C., and emulsification was performed for 3 min to obtain an emulsified asphalt.

(79) 100 g of the emulsified asphalt, 100 g of a waterborne acrylic resin emulsion, and 1000 g of a mineral aggregate were mixed and stirred at normal temperature for 100 s to obtain a waterborne acrylic resin emulsified asphalt concrete.

(80) In the above, the mineral aggregate was basalt; the mineral aggregate was composed of a crude aggregate, a fine aggregate, and a filler, the weight ratio of the crude aggregate, the fine aggregate, and the filler was 50:50:8, the crude aggregate had a nominal particle size of >4.75 mm, the fine aggregate had a nominal particle size of 4.75 mm, the filler had a nominal particle size of 0.075 mm; the waterborne acrylic resin emulsion was a commercially available linear molecule type waterborne acrylic resin emulsion having a solid content of 55%.

Comparative Example II-1

(81) A cold-mixed emulsified asphalt concrete was prepared in the same manner as that of Example II-6, except that the waterborne acrylic resin emulsion was not added.

Comparative Example II-2

(82) 60 g of an asphalt was weighed and slowly added to 1000 g of a mineral aggregate after heated to 150 C., and stirring was performed for at normal temperature for 150 s to obtain a hot-mixed asphalt concrete.

(83) In the above, the mineral aggregate was basalt; the mineral aggregate was composed of a crude aggregate, a fine aggregate, and a filler, the weight ratio of the crude aggregate, the fine aggregate, and the filler was 50:60:7, the crude aggregate had a nominal particle size of >4.75 mm, the fine aggregate had a nominal particle size of 4.75 mm, the filler had a nominal particle size of 0.075 mm.

Test Example II-1

(84) The waterborne acrylic resin emulsified asphalt concretes prepared in Examples II-1 to II-6, the hot-mixed asphalt concrete prepared in Comparative Example II-1, and the cold-mixed emulsified asphalt concrete prepared in Comparative Example II-2 were molded into test pieces according to the specification Standard Test Methods of Bitumen and Bituminous Mixture for Highway Engineering (JTG E20-2011), were cured, and the Marshall performance test was performed. The test results are as shown in Table 2.

(85) TABLE-US-00008 TABLE 2 Results of Marshall Performance Test Technical Comparative Comparative Example Example Example Example Example Example requirements Example II-1 Example II-2 II-1 II-2 II-3 II-4 II-5 II-6 Marshall 8 3.67 9.94 33.76 20.58 8.59 45.34 10.07 31.25 stability kN Note: technical requirements are on the basis of Standard Test Methods of Bitumen and Bituminous Mixture for Highway Engineering (JTG E20-2011) T0709

(86) It can be seen from Table 2 that the cold-mixed emulsified asphalt concrete prepared in Comparative Example II-1 has poor stability, the index of Marshall stability thereof does not reach the technical requirements, and can not be used for road pavement; and upon the modification action of the waterborne acrylic resin, the Marshall stability of the waterborne acrylic resin emulsified asphalt concretes prepared in Examples II-1 to II-6 are improved to 2 times more than those of the Comparative Example II-1 or more, and that of Example II-4 may be even up to 12 times or more.

(87) Comparative Example II-2 is a conventional hot-mixed asphalt concrete, and it can be known from Table 2 that all indices of the waterborne acrylic resin emulsified asphalt concrete of this invention are close to or even beyond those of a hot-mixed asphalt concrete.

(88) In summary, the waterborne acrylic resin emulsified asphalt concrete prepared in this present invention has high strength and good mechanical properties, achieves the technical effects of a hot-mixed asphalt concrete by the modification action of the waterborne acrylic resin by using a process of cold mixing. It is a road surface material having excellent pavement performance, and may be widely used in the preparation of asphalt concrete pavement materials, asphalt road surface repair materials, slurry seals for curing, micro-surfacing, asphalt mortar for high-speed railways, etc.

Example III-1

(89) 1. Preparation of Waterborne Epoxy Resin Emulsion

(90) 100 g of a waterborne epoxy resin and 150 g of diethylene triamine were mixed, the mixed emulsion was sufficiently stirred by using a low-speed stirrer for 7.5 min, and the mixture was allowed to be uniform to obtain a waterborne epoxy resin emulsion.

(91) In the above, The waterborne epoxy resin was a standard liquid epoxy resin having a solid content of 75%;

(92) wherein diethylene triamine had a solid content of 50%.

(93) 2. Preparation of Epoxy Emulsified Asphalt

(94) 50 g of the waterborne epoxy resin emulsion was poured into 120 g of an anionic emulsified asphalt, and uniform stirring was performed to prepare a waterborne epoxy emulsified asphalt.

(95) 3. Preparation of Micro-Surfacing Mixture

(96) Materials were prepared according to the following weight proportion:

(97) TABLE-US-00009 mineral aggregate 1000 g water 80 g waterborne epoxy emulsified asphalt 170 g

(98) Water was added to the mineral aggregate, uniform stirring was performed at normal temperature, the waterborne epoxy resin emulsified asphalt was further added, and stirring was continued for 100 s to obtain a micro-surfacing mixture.

(99) In the above, the mineral aggregate was composed of a crude aggregate, a fine aggregate, and a filler; wherein the weight ratio of the crude aggregate, the fine aggregate, and the filler was 20:40:10; the crude aggregate had a nominal particle size of 4.75 mm<9.5 mm; the fine aggregate had a nominal particle size of 4.75 mm; the filler had a nominal particle size of 0.075 mm.

Example III-2

(100) 1. Preparation of Waterborne Epoxy Resin Emulsion

(101) 10 g of a waterborne epoxy resin and 20 g of polyamide-650 were mixed, the mixed emulsion was sufficiently stirred by using a low-speed stirrer for 5 min, and the mixture was allowed to be uniform to obtain a waterborne epoxy resin emulsion.

(102) In the above, The waterborne epoxy resin was a water-soluble epoxy resin having a solid content of 50%;

(103) wherein polyamide-650 had a solid content of 70%.

(104) 3. Preparation of Epoxy Emulsified Asphalt

(105) 10 g of the waterborne epoxy resin emulsion was poured into 120 g of an anionic emulsified asphalt, and uniform stirring was performed to prepare a waterborne epoxy emulsified asphalt.

(106) 4. Preparation of Micro-Surfacing Mixture

(107) Materials were prepared according to the following weight proportion:

(108) TABLE-US-00010 mineral aggregate 1000 g cement 20 g water 60 g waterborne epoxy emulsified asphalt 130 g

(109) The cement was added to the mineral aggregate, uniform stirring was performed at normal temperature, water was further added, stirring was continued to form a uniform mixture, the waterborne epoxy resin emulsified asphalt was further added, and stirring was continued for 30 s to obtain a micro-surfacing mixture.

(110) In the above, the mineral aggregate was composed of a crude aggregate, a fine aggregate, and a filler; wherein the weight ratio of the crude aggregate, the fine aggregate, and the filler was 10:55:5, the crude aggregate had a nominal particle size of 4.75 mm<9.5 mm; the fine aggregate had a nominal particle size of 4.75 mm; the filler had a nominal particle size of 0.075 mm.

Example III-3

(111) 1. Preparation of Waterborne Epoxy Resin Emulsion

(112) 100 g of a waterborne epoxy resin and 100 g of N,N-dihydroxyethyl diethylene triamine were mixed, 300 g of water was further added, the mixed emulsion was sufficiently stirred by using a low-speed stirrer for 10 min, and the mixture was allowed to be uniform to obtain a waterborne epoxy resin emulsion.

(113) In the above, The waterborne epoxy resin was a water-soluble epoxy resin having a solid content of 100%;

(114) wherein N,N-dihydroxyethyl diethylene triamine has a solid content of 30%.

(115) 4. Preparation of Epoxy Emulsified Asphalt

(116) 10 g of the waterborne epoxy resin emulsion was poured into 100 g of an anionic emulsified asphalt, and uniform stirring was performed to prepare a waterborne epoxy emulsified asphalt.

(117) 5. Preparation of Micro-Surfacing Mixture

(118) Materials were prepared according to the following weight proportion:

(119) TABLE-US-00011 mineral aggregate 1000 g mineral fiber 30 g water 110 g waterborne epoxy emulsified asphalt 110 g

(120) The mineral fiber was added to the mineral aggregate, uniform stirring was performed at normal temperature, water was further added, stirring was continued to form a uniform mixture, the waterborne epoxy resin emulsified asphalt was further added, and stirring was continued for 180 s to obtain a micro-surfacing mixture.

(121) In the above, the mineral aggregate was composed of a crude aggregate, a fine aggregate, and a filler; wherein the weight ratio of the crude aggregate, the fine aggregate, and the filler was 30:85:15; the crude aggregate has a nominal particle size of 4.75 mm<9.5 mm; the fine aggregate has a nominal particle size of 4.75 mm; the filler has a nominal particle size of 0.075 mm.

Example III-4

(122) 1. Preparation of Waterborne Epoxy Resin Emulsion

(123) 100 g of a waterborne epoxy resin and 150 g of polyamide 650 were mixed, 100 g of water was further added, the mixed emulsion was sufficiently stirred by using a low-speed stirrer for 7.5 min, and the mixture was allowed to be uniform to obtain a waterborne epoxy resin emulsion.

(124) In the above, the waterborne epoxy resin was a water-soluble epoxy resin having a solid content of 75%;

(125) wherein polyamide 650 had a solid content of 50%.

(126) 2. Preparation of Micro-Surfacing Mixture

(127) Materials were prepared according to the following weight proportion:

(128) TABLE-US-00012 mineral aggregate 1000 g aluminum sulfate 10 g water 110 g waterborne epoxy resin emulsion 120 g anionic emulsified asphalt 100 g

(129) Aluminum sulfate was added to the mineral aggregate, water was added after uniform stirring, the waterborne epoxy resin emulsion and the emulsified asphalt were further added after uniform stirring, and stirring was performed for 120 s to obtain a micro-surfacing mixture.

(130) In the above, the mineral aggregate was composed of a crude aggregate, a fine aggregate, and a filler; wherein the weight ratio of the crude aggregate, the fine aggregate, and the filler was 10:85:5, the crude aggregate has a nominal particle size of 4.75 mm<9.5 mm; the fine aggregate has a nominal particle size of 4.75 mm; the filler has a nominal particle size of 0.075 mm.

Example III-5

(131) 1. Preparation of Waterborne Epoxy Resin Emulsion

(132) 10 g of a waterborne epoxy resin and 20 g of polyamide 650 were mixed, 50 g of water was further added, the mixed emulsion was sufficiently stirred by using a low-speed stirrer for 5 min, and the mixture was allowed to be uniform to obtain a waterborne epoxy resin emulsion.

(133) In the above, The waterborne epoxy resin was a water-soluble epoxy resin having a solid content of 100%;

(134) wherein polyamide 650 had a solid content of 70%.

(135) 2. Preparation of Micro-Surfacing Mixture

(136) Materials were prepared according to the following weight proportion:

(137) TABLE-US-00013 mineral aggregate 1000 g polyacrylamide 20 g water 60 g waterborne epoxy resin emulsion 5 g anionic emulsified asphalt 150 g

(138) A water solution of an emulsifier was added to the mineral aggregate, water was added after uniform stirring, the waterborne epoxy resin emulsion and the emulsified asphalt were further added after uniform stirring, and stirring was performed for 50 s to obtain a micro-surfacing mixture.

(139) In the above, the mineral aggregate was composed of a crude aggregate, a fine aggregate, and a filler; wherein the weight ratio of the crude aggregate, the fine aggregate, and the filler was 30:55:15; the crude aggregate has a nominal particle size of 4.75 mm<9.5 mm; the fine aggregate has a nominal particle size of 4.75 mm; the filler has a nominal particle size of 0.075 mm.

Comparative Example III-1

(140) Materials were prepared according to the following weight proportion:

(141) TABLE-US-00014 mineral aggregate 1000 g water 80 g SBR modified emulsified asphalt 170 g

(142) wherein the content of SBR comprised 4% of the emulsified asphalt, and the SBR modified emulsified asphalt had a solid content of 50%.

(143) Water was added to the mineral aggregate, a uniform mixture was formed by stirring, the SBR modified emulsified asphalt was further added, and stirring was continued for 100 s to obtain the one of interest.

(144) In the above, the mineral aggregate was composed of a crude aggregate, a fine aggregate, and a filler; wherein the weight ratio of the crude aggregate, the fine aggregate, and the filler was 20:40:10; the crude aggregate has a nominal particle size of 4.75 mm<9.5 mm; the fine aggregate has a nominal particle size of 4.75 mm; the filler has a nominal particle size of 0.075 mm.

Test Example III-1 Determination of Wear Resistant Property

(145) A 1 h wet rut abrasion value was used to evaluate the abrasion resistant property of micro-surfacing, and a smaller 1 h wet rut abrasion value indicates a better abrasion resistant property. The method of determination was JTG E20-2011 Standard Test Methods of Bitumen and Bituminous Mixture for Highway Engineering T0752-2011. The test results are as shown in Table 3.

(146) It can be known from Table 3 that the micro-surfacing mixture of this invention has significantly improved wear resistance compared to that of Comparative Example, and the 1 h wet rut abrasion value thereof is less than half of that of Comparative Example III-1.

Test Example III-2 Determination of Water Damage Resistant Property

(147) A 6 d wet rut abrasion value was used to evaluate the abrasion resistant property of micro-surfacing, and a smaller 6 d wet rut abrasion value indicates a better abrasion resistant property. The method of determination was JTG E20-2011 Standard Test Methods of Bitumen and Bituminous Mixture for Highway Engineering T0752-2011. The test results can be seen in Table 3.

(148) It can be known from Table 3 that the micro-surfacing mixture of this invention has significantly improved water damage resistant property compared to that of Comparative Example, and the 1 h wet rut abrasion value is reduced by more than 25% with respect to that of Comparative Example III-1.

Test Example III-3 Determination of Rut Resistant Property

(149) A width deformation rate in a rut deformation test was used to evaluate the rut resistant property of micro-surfacing, and a smaller rut deformation rate indicates a better rut resistant property. The method of determination was JTG E20-2011 Standard Test Methods of Bitumen and Bituminous Mixture for Highway Engineering T0756-2011. The test results can be seen in Table 3.

(150) It can be known from Table 3 that rut deformation rates of the micro-surfacing mixtures of this invention are all lower than that of Comparative Example III-1, in which the Example III-4 has the best effect, and the rut deformation rate is reduced by 34.61% compared to Comparative Example III-1.

(151) TABLE-US-00015 TABLE 3 Experiment Results of Micro-surfacing Comparative Evaluation indices Example III-1 Example III-1 Example III-2 Example III-3 Example III-4 Example III-5 1 h wet rut abrasion value 450.6 66.5 83.5 201.2 54.7 89.1 (g/m.sup.2) 6 d wet rut abrasion value 780.6 240.6 351.9 560.2 180.7 453.9 (g/m.sup.2) Rut deformation rate (%) 5.2 3.8 4.4 5.1 3.4 4.7