Modified nonvolatile cold asphalt binder and recycled asphalt mixture using thereof

Abstract

A nonvolatile cold modified asphalt binder and a nonvolatile cold recycled asphalt mixture using the same are manufactured by optimally mixing a petroleum asphalt, a native asphalt, a polymer modifier, process oil, and an adhesive strength enhancer. The nonvolatile cold modified asphalt binder includes at least one petroleum asphalt selected from a straight asphalt or a blown asphalt; at least one native asphalt selected from gilsonite, glance pitch, and grahamite; a rubber-modified-compound (RMC) polymer modifier which is a vinyl aromatic hydrocarbon-conjugated diene block copolymer including at least one of a styrene-butadiene block copolymer (SBS), a styrene-isoprene block copolymer (SIS), and a styrene-ethylene-butylene block copolymer (SEBS); at least one process oil selected from paraffin oil, naphthenic oil, aromatic oil, natural oil, and mineral oil; and at least one adhesive strength enhancer selected from rosin esters, modified acryls, modified silicones, polyvinyl esters, and silicone resins.

Claims

1. A nonvolatile cold modified asphalt binder comprising: A) 0.1 to 30 wt % of at least one petroleum asphalt selected from a straight asphalt or a blown asphalt; B) 0.1 to 30 wt % of at least one native asphalt selected from gilsonite, glance pitch, and grahamite; C) 0.1 to 15 wt % of a rubber-modified-compound (RMC) polymer modifier which is a vinyl aromatic hydrocarbon-conjugated diene block copolymer including at least one of a styrene-butadiene block copolymer (SBS), a styrene-isoprene block copolymer (SIS), and a styrene-ethylene-butylene block copolymer (SEBS); D) 20 to 50 wt % of at least one process oil selected from paraffin oil, naphthenic oil, aromatic oil, natural oil, and mineral oil; and (E) 0.5 to 30 wt % of at least one adhesive strength enhancer selected from rosin esters, modified acryls, modified silicones, polyvinyl esters, and silicone resins, wherein the nonvolatile cold modified asphalt binder is manufactured via steps of: a) preparing the petroleum asphalt and the native asphalt by heating to 160 to 170° C.; b) adding the rubber-modified-compound polymer modifier of C) to the heated petroleum asphalt and native asphalt and performing stirring in a batch plant at a temperature of 170 to 180° C. for three hours or more, thus manufacturing a modified asphalt; c) adding the adhesive strength enhancer to the modified asphalt and performing stirring at a temperature of 170 to 180° C. for one hour or more; d) adding the process oil to the modified asphalt containing the adhesive strength enhancer obtained during step c) and performing stirring at a temperature of 170 to 180° C. for one hour or more; and e) cooling a mixture after step d).

2. A nonvolatile cold recycled asphalt mixture comprising: 1 to 3 wt % of a nonvolatile cold modified asphalt binder; 93 to 97 wt % of a recycled aggregate; and 2 to 4 wt % of a filler, wherein the nonvolatile cold asphalt binder includes: 0.1 to 30 wt % of at least one petroleum asphalt selected from a straight asphalt or a blown asphalt; 0.1 to 30 wt % of at least one native asphalt selected from gilsonite, glance pitch, and grahamite; 0.1 to 15 wt % of a rubber-modified-compound (RMC) polymer modifier which is a vinyl aromatic hydrocarbon-conjugated diene block copolymer including at least one of a styrene-butadiene block copolymer (SBS), a styrene-isoprene block copolymer (SIS), and a styrene-ethylene-butylene block copolymer (SEBS); 20 to 50 wt % of at least one process oil selected from paraffin oil, naphthenic oil, aromatic oil, natural oil, and mineral oil; and 0.5 to 30 wt % of at least one adhesive strength enhancer selected from rosin esters, modified acryls, modified silicones, polyvinyl esters, and silicone resins.

3. The nonvolatile cold recycled asphalt mixture of claim 2, wherein the nonvolatile cold recycled asphalt mixture is packed in a paper bag package, a paper box package, a tonne bag package, or a nonwoven-pack package.

4. The nonvolatile cold recycled asphalt mixture of claim 2, wherein the nonvolatile cold recycled asphalt mixture is applied to a sidewalk, a bicycle road, or a walkway.

Description

EXAMPLE 1

(1) 3 wt % of a filler and 2 wt % of a nonvolatile cold modified asphalt binder were added to 95 wt % of a recycled asphalt aggregate at room temperature, and were mixed uniformly.

EXAMPLE 2

(2) 92 wt % of a recycled asphalt aggregate, 3 wt % of a virgin aggregate, 2 wt % of a filler, and 3 wt % of a nonvolatile cold modified asphalt binder were added at room temperature, and were mixed uniformly.

Comparative Example 1

(3) 6 wt % of a cutback asphalt binder (D company) heated to 50 to 60° C. was added to 91 wt % of a dried virgin aggregate and 3 wt % of a filler, and were mixed uniformly.

Comparative Example 2

(4) 7 wt % of an emulsified asphalt binder, 30 wt % of a virgin aggregate, 60 wt % of a recycled aggregate, and 3 wt % of a filler were added at room temperature, and were mixed uniformly.

Result

(5) 1) KS F 2337 Resistance test for plastic flow of bituminous mixture using Marshall tester

(6) TABLE-US-00001 TABLE 1 Comparative Comparative Item Example 1 Example 2 Example 1 Example 2 Marshall stability 3,780 3,860 2,500 3,800 (N) Flow (1/100 cm) 27 32 35 32 Porosity (%) 7.8 8.3 15.5 12.0 Dynamic stability 934 1,070 110 550 (times/mm)

(7) When the nonvolatile cold modified asphalt binder of the present invention was used, the result showed that the Marshall stability significantly exceeded that of a domestic cold asphalt. In particular, the dynamic stability was significantly higher than that of conventional combinations using the emulsified asphalt or cutback asphalt (Comparative Examples 1 and 2). Accordingly, the nonvolatile cold modified asphalt binder of the present invention is considered to be very suitable as a cold repair material.

(8) 2) KS F 2386 Tensile adhesive strength test for attachment surface of road pavement body (20° C., MPa)

(9) TABLE-US-00002 TABLE 2 Exam- Exam- Comparative Comparative Item ple 1 ple 2 Example 1 Example 2 Dry Asphalt upper 0.62 0.78 0.15 0.14 plate Concrete upper 0.48 0.51 0.10 0.12 plate Wet Asphalt upper 0.54 0.61 0 (impossible 0.9 plate to measure) Concrete upper 0.43 0.49 0 (impossible 0.07 plate to measure)

(10) In the case of the mixture using the nonvolatile cold modified asphalt binder of the present invention, a main binder is based on an asphalt and showed excellent adhesion to the asphalt upper plate or concrete upper plate. On the other hand, in the case when the emulsified asphalt binder mixture or the cutback asphalt binder mixture was used in the wet asphalt upper plate or concrete upper plate, the adhesion was relatively very low due to the use of water-type emulsions and volatile solvents.

(11) 3) Checking of whether or not volatile components and inorganic binders are used and comparison of storage periods

(12) TABLE-US-00003 TABLE 3 Comparative Comparative Item Example 1 Example 2 example 1 example 2 Volatile ∘ component Storage Two years Two years Three months 3 to 5 hours period or more or more after mixing Inorganic ∘ binder

INDUSTRIAL APPLICABILITY

(13) A nonvolatile cold recycled asphalt mixture including a nonvolatile cold recycled asphalt binder of the present invention may be used in pavement and repairing of roads using an asphalt upper plate or concrete upper plate, may be used to pave and repair a sidewalk, a bicycle road, or a walkway, and particularly may be used in pavement and repairing even in case of rain, such as a state where humidity is high or a moisture state, and in winter.