Crack resistant micro surfacing composition
A polymer-modified emulsion used for micro surfacing paving applications that results in a durable paving composition. The residue from the emulsion exhibits a resistance to cracking and an overall reduction in reflective cracking.
1. A polymer-modified asphalt emulsion comprising:
a stable liquid emulsion containing an asphalt phase comprising an asphalt and a polymer, and
an aqueous phase comprising water and an emulsifying agent, wherein the asphalt has a penetration value of 100 to 250 according to ASTM D5, the polymer comprises from 4% to 8% by weight of the total weight of the asphalt phase, and a residue recovered from the emulsion after emulsion breaking has a penetration value of 110 to 160 according to ASTM D5 and exhibits a resistance to cracking as demonstrated by a value according to the Overlay Test of greater than 50 cycles to failure.
2. A polymer-modified asphalt emulsion according to claim 1 , wherein the residue recovered from the emulsion has a penetration value of 130 to 150 according to ASTM D5.
3. A polymer-modified asphalt emulsion according to claim 1 , wherein the residue exhibits a resistance to cracking as demonstrated by a value according to the Overlay Test of greater than 100 cycles to failure.
4. A polymer-modified asphalt emulsion according to claim 1 , wherein the asphalt comprises from about 92% to about 96% by weight of the total weight of the asphalt phase.
5. A polymer-modified asphalt emulsion according to claim 1 , wherein the polymer comprises styrene-butadiene rubber, styrene-butadiene-styrene rubber, polychloroprene, styrene butadiene plastomer, polyurethane, thermoplastic olefin or thermoplastic polyamide.
6. A polymer-modified asphalt emulsion according to claim 1 , wherein the polymer comprises elastomer or plastomer.
7. A polymer-modified asphalt emulsion according to claim 1 , wherein the emulsifying agent comprises from about 0.01% to about 5% by weight of the total weight of the emulsion.
8. A polymer-modified asphalt emulsion according to claim 1 , wherein the is selected from cationic emulsifiers, anionic emulsifiers, non-ionic emulsifiers, and amphoteric emulsifiers.
9. A polymer-modified asphalt emulsion according to claim 1 , further comprising an additive selected from stabilizing agents, adhesion promotors, biocides, anti-freeze agents, break control additives, peptizing agents, asphalt additives, curing promoters, pH adjusters, viscosity modifiers, tackiness control additives, pigments, UV resistance additives, surface active agents, and combinations thereof.
10. A micro surfacing paving composition comprising the polymer-modified asphalt emulsion of claim 1 and aggregate.
11. A micro surfacing paving composition according to claim 10 , wherein the polymer-modified asphalt emulsion comprises greater than 10% by weight of the micro surfacing paving composition.
12. A micro surfacing paving composition according to claim 10 , wherein the aggregate comprises Type II or Type III aggregate according to the ISSA A143 standard aggregate grading scale.
13. A micro surfacing paving composition according to claim 10 , further comprising a mineral filler categorized under ASTM D242.
14. An article comprising pavement with an aggregate-filled residue after emulsion breaking of the micro-surfacing paving composition of claim 10 applied thereon.
15. An article according to claim 14 , wherein a residue recovered after emulsion breaking of the micro surfacing paving composition has a penetration value of 130 to 150 according to ASTM D5.
16. An article according to claim 14 , wherein a residue recovered after emulsion breaking of the micro surfacing paving composition exhibits a resistance to cracking as demonstrated by a value according to the Overlay Test of greater than 100 cycles to failure.
17. A method comprising:
applying onto a paved surface,
(a) a polymer-modified asphalt emulsion comprising:
a stable liquid emulsion containing an asphalt phase comprising an asphalt and a polymer, and
an aqueous phase comprising water and an emulsifying agent; and
(b) aggregate, and breaking the emulsion to form a residue bonded to the paved surface, wherein the asphalt has a penetration value of 100 to 250 according to ASTM D5, the polymer comprises from 4% to 8% by weight of the total weight of the asphalt phase, and a residue recovered from the emulsion after emulsion breaking has a penetration value of 110 to 160 according to ASTM D5 and exhibits a resistance to cracking as demonstrated by a value according to the Overlay Test of greater than 50 cycles to failure.
18. A polymer-modified asphalt emulsion comprising: a stable liquid emulsion comprising an asphalt, a polymer, water and an emulsifying agent, wherein the asphalt has a penetration value of 100 to 250 according to ASTM D5, the polymer comprises from 4% to 8% by weight of the total weight of the asphalt phase, and a residue recovered from the emulsion after emulsion breaking has a penetration value of 110 to 160 according to ASTM D5 and exhibits a resistance to cracking as demonstrated by a value according to the Overlay Test of greater than 50 cycles to failure.
19. A polymer-modified asphalt composition according to claim 18 , wherein the polymer is added with the water as an aqueous dispersion.