Bituminous paving composition and process for bituminous paving

摘要

The invention provides a bituminous composition, a process for preparing a bituminous paving composition and process for bituminous paving having lower mixing, paving, and compaction temperatures than for conventional hot-mix paving while retaining sufficient performance characteristics of conventional hot-mix paving. The inventive paving process comprises the steps of injecting a foamable solution comprising a lubricating substance into a heated, asphalt binder to provide a heated, foamed mixture; adding the heated, foamed mixture to a suitable, heated aggregate; further mixing the heated, foamed mixture and heated aggregate to coat the heated aggregate with the heated, foamed, asphalt binder to form a heated paving material; supplying the heated paving material to a paving machine; applying the heated paving material by the paving machine to a surface to be paved; and compacting the applied paving material to form a paved surface.

主权项

1. A process of preparing a warm mix paving composition comprising the steps of:
a) combining an aqueous solution, the aqueous solution comprising water and a lubricating substance, with an asphalt binder heated to a warm mix temperature of about 230-325° F. to provide a heated foamed asphalt binder, and b) mixing the heated foamed asphalt binder with aggregate heated to a temperature of about 180-300° F. to coat the aggregate and form a warm mix paving composition containing asphalt binder, lubricating substance and aggregate, wherein the process reduces the thermal energy used to achieve suitable mixing and paving compared to a conventional hot mix paving composition prepared from the asphalt binder without the aqueous solution, and without adversely affecting paving using the warm mix paving composition.