Method for producing bituminous compositions
AssigneeMeadWestvaco Corporation
InventorsEverett Crews, Tom Girardeau, Iain Jack
Life of this patent
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Abstract
This invention relates to bituminous compositions and methods of producing the same. More particularly, the invention relates to the production of bituminous compositions formulated with performance-graded bitumen-containing solvent-free bitumen emulsions which exhibit controllable, temperature-dependent interfacial rheology. When employed in paving applications, these bituminous compositions develop adhesive strength and load-bearing strength properties at rates comparable to traditional hot mix paving compositions and at rates faster than traditional cold mix paving compositions.
Claims22
A bituminous composition for surface paving, at a temperature of 50-140° C. comprising:
- (a) solvent-free, oil-in-water bitumen emulsion in an amount from about 2% to about 10% by total weight of the bituminous composition, wherein the oil-in-water bitumen emulsion comprises:
- (i) bitumen in an amount from about 50% to about 75% by total weight of the bitumen emulsion,
- (ii) at least one active emulsifier in an amount from about 0.05% to about 2.0% by total weight of the bitumen emulsion, and
- (iii) water in an amount to complete the emulsion;
- and
- (b) aggregate in an amount from about 90% to about 98% by total weight of the bituminous composition;
- and
- wherein the bituminous composition is in an absence of bitumen having a penetration number of more than 220 dmm as determined according to an ASTM standard method D5 at 25° C., and wherein the bituminous composition has a temperature range of about 50° C. to 140° C.
A paved road, including a layer of a bituminous composition, wherein the bituminous composition comprises:
- (a) solvent-free, oil-in-water bitumen emulsion in an amount from about 2% to about 10% by total weight of the bituminous composition, wherein the oil-in-water bitumen emulsion comprises:
- (i) bitumen in an amount from about 50% to about 75% by total weight of the bitumen emulsion,
- (ii) at least one active emulsifier in an amount from about 0.05% to about 2.0% by total weight of the bitumen emulsion, and
- (iii) water in an amount to complete the emulsion;
- and
- (b) aggregate in an amount from about 90% to about 98% by total weight of the bituminous composition;
- and
- wherein the bituminous composition is in an absence of bitumen having a penetration number of more than 220 dmm as determined according to an ASTM standard method D5 at 25° C., wherein the bituminous composition is applied to the road at a temperature range of about 50° C. and 140° C., and wherein the bituminous composition has a temperature range of about 50° C. to 140° C.
Dependencies are inferred from the claim text.