Void Reducing Asphalt Membrane Emulsion

Abstract

Provided herein is an asphalt membrane emulsion for reducing voids in an asphalt joint that includes asphalt, an asphalt modifier, mineral filler, an emulsifier, and water. Provided herein is a method of making an asphalt membrane emulsion, the method including: forming a first phase; forming a second phase; pumping the first phase and the second phase into a colloid mill; and mixing the first phase and second phase into the colloid mill to form the asphalt membrane emulsion. The first phase includes asphalt, asphalt modifier, and mineral filler. The second phase includes water and an emulsifier. A method of applying an asphalt membrane emulsion to fill a crack is also provided.

Claims

1. An asphalt membrane emulsion for reducing voids in an asphalt joint comprising asphalt, an asphalt modifier, mineral filler, an emulsifier, and water.

2. The asphalt membrane emulsion of claim 1, wherein the asphalt comprises performance grade (PG) 64-22, PG 58-28, PG 58-22, PG 52-28, PG 52-22, PG 52-34, PG 58-34, or combinations thereof.

3. The asphalt membrane emulsion of claim 1, wherein the asphalt modifier comprises isocyanate, styrene butadiene, styrene butadiene styrene, styrene butadiene rubber, polystyrene, polychloroprene, dispersions thereof, or combinations thereof.

4. The asphalt membrane emulsion of claim 3, wherein the asphalt modifier comprises styrene butadiene styrene.

5. The asphalt membrane emulsion of claim 1, wherein the mineral filler comprises lime.

6. The asphalt membrane emulsion of claim 1, wherein the asphalt membrane emulsion is a cationic asphalt membrane emulsion.

7. The asphalt membrane emulsion of claim 6, wherein the cationic asphalt membrane emulsion comprises a cationic emulsifier.

8. The asphalt membrane emulsion of claim 6, wherein the asphalt membrane emulsion does not comprise an acid.

9. The asphalt membrane emulsion of claim 1, wherein the asphalt membrane emulsion is an anionic asphalt membrane emulsion.

10. The asphalt membrane emulsion of claim 9, wherein the anionic asphalt membrane emulsion comprises an anionic emulsifier.

11. The asphalt membrane emulsion of claim 9, wherein the asphalt membrane emulsion comprises a base, wherein the base comprises sodium hydroxide, potassium hydroxide, or combinations thereof.

12. The asphalt membrane emulsion of claim 7, wherein the cationic emulsifier is a quaternary ammonium salt based emulsifier.

13. The asphalt membrane emulsion of claim 1, further comprises a thickener.

14. The asphalt membrane emulsion of claim 13, wherein the thickener comprises a water-soluble cellulose backbone and ether containing substituents.

15. The asphalt membrane emulsion of claim 14, wherein the thickener comprises methyl cellulose, sodium carboxymethyl cellulose, hydroxypropyl cellulose, ethyl hydroxyethyl cellulose, hydroxyethyl cellulose, methyl hydroxypropyl cellulose, methyl ethyl hydroxyethyl cellulose, or combinations thereof.

16. The asphalt membrane emulsion of claim 15, wherein the thickener is methyl hydroxypropyl cellulose.

17. The asphalt membrane emulsion of claim 1, further comprising an acid, wherein the acid comprises hydrochloric acid, sulfuric acid, acetic acid, or combinations thereof.

18. The asphalt membrane emulsion of claim 1, further comprising a sulfur cross-linker.

19. A method of making an asphalt membrane emulsion, the method comprising: forming a first phase comprising: asphalt; asphalt modifier; and mineral filler; forming a second phase comprising: water; and an emulsifier; pumping the first phase and the second phase into a colloid mill; and mixing the first phase and second phase in the colloid mill to form the asphalt membrane emulsion.

20. An asphalt surface comprising a crack and a cured asphalt membrane emulsion within said crack; wherein the cured asphalt membrane emulsion within the crack comprises asphalt, an asphalt modifier, mineral filler, and an emulsifier.

Description

EXAMPLES

Example 1

[0170] The raw materials in Table 1 below were combined according to the process described in Table 1 to form Asphalt First Phase A.

TABLE-US-00004 TABLE 1 Recom- Range mended of Raw Material wt. % wt. % Process Asphalt 87.87 85-89 Heat to 300-350° F. for modification Heat to 380° F. for emulsification Styrene 6.75 6-8 Add to heated asphalt using in-line Butadiene mixing, tank mixing, and/or in-line Styrene (SBS) milling to form SBS modified asphalt Sulfur Cross- 0.38 0.25- Add to SBS modified asphalt using in- Linker 0.5 line mixing, tank mixing, and/or in-line milling to form SBS and sulfur modified asphalt Mineral Filler 5 3-7 Add to SBS and sulfur modified asphalt using in-line mixing, tank mixing, and/or in-line milling

Example 2

[0171] The raw materials in Table 2 below were combined according to the process described in Table 1 to form Cationic Second Phase A.

TABLE-US-00005 TABLE 2 Recom- Range Raw mended of Material wt. % wt. % Process Water 94.5 92-97 Ambient temperature and municipally sourced having a pH of 6-8 Thickener 0.5 0-1% Heat the mix water and thickener up to 120° F., while mixing, until the thickener is fully dissolved in the water (Optional) Emulsifier 5 3.5-6   Any emulsifier recommended for highly viscous asphaltic products, such as, the Quaternary Ammonium Salt emulsifier, is added to the previous mix while the temperature is maintained at 120° F. The speed of the mixer and mixing time is adjusted in such a manner that the emulsifier has a chemical interaction with the thickener until the rheological modification occurs as confirmed by continuous wave contour without fixed points. For low viscosity asphaltic products without a thickener, the mix water and emulsifier is heated up to 120° F., while mixing Acid 0   0-0.5 Add acid, when used, to water mixture to obtain a pH between 1 and 3

Example 3

[0172] The Asphalt First Phase A and the Cationic Second Phase A, from Examples 1 and 2 respectively, were combined in the amounts and according to the process described in Table 3 to form Asphalt Membrane Emulsion A.

TABLE-US-00006 TABLE 3 Recom- Range mended of Raw Material wt. % wt. % Process Cationic 35 30-40 Run Cationic Second Phase A through Second the colloid mill at 100-120° F. Phase A Asphalt First 65 60-70 Add Asphalt First Phase A to colloidal Phase A mill at 360-380° F.; Ensure that mixture in colloidal mill output does not exceed 212° F. so that the water is not boiled off (ideal output temperature is 205° F.)

[0173] Physical properties associated with Asphalt Membrane Emulsion A are as shown in Table 4. The unit for Paddle Cannon viscosity is milliPascal-second (mPa.Math.s). Equivalent ASTM methods, AASHTO methods, or other standard tests may be used.

TABLE-US-00007 TABLE 4 Test Procedure Recommended Values Saybolt viscosity (seconds) (Optional) AASHTO T 59 100-400 seconds Paddle Cannon viscosity (mPa .Math. s) AASHTO T382 Minimum 500 mPa .Math. s at 50° C. Sieve (%) AASHTO T 59 Maximum 0.10% Storage Stability 24 hours (%) AASHTO T 59 Maximum 1% over 24 hours % Residue by Evaporation (%) ASTM D 7404 Minimum 65%

[0174] Physical properties associated with the residue of Asphalt Membrane Emulsion A are as shown in Table 5, where DSR means Dynamic Shear Rheometer and MSCR means Multiple Stress Creep Recovery. The unit for rotational viscosity is centipoise (cP). Equivalent ASTM methods, AASHTO methods, or other standard tests may be used.

TABLE-US-00008 TABLE 5 Test Procedure Recommended Values Pen on evaporation AASTHO T 49 20-80 residue DSR tests AASHTO M320 88 minutes Original DSR (ODSR) 90 minutes TruGrade Temp. DSR MSCR Test AASHTO M350 E Grade MSCR on unaged residue Rotational Viscosity ASTM D4402/ Max 3000 cP at 135° C. D4402M Max 600 cP at 165° C. Max 350 cP at 176.6° C.

[0175] It will be readily appreciated by those skilled in the art that modifications may be made to the invention without departing from the concepts disclosed in the foregoing description. Accordingly, the particular embodiments described in detail herein are illustrative only and are not limiting to the scope of the invention, which is to be given the full breadth of the appended claims and any and all equivalents thereof.