HOT-MIX ASPHALT PAVING MIXTURE

摘要

A hot-mix asphalt paving mixture includes the use of a hard, angular, non-carbonate ½″ minus igneous crushed rock, washed rounded No. 100 sieve silica sand particles, ½″ minus recycled asphalt pavement particles, and a performance-graded bituminous liquid asphalt binder, thereby to produce an environmentally-friendly hot asphalt mixture that is laid with minimal compaction effort, and without the use of conventional compaction-aiding additives that chemically alter the viscosity of the liquid asphalt binder. During compaction, the rounded silica sand particles react with the igneous rock particles as a mechanical compaction aid, thereby allowing the angular particles to achieve proper aggregate interlock with minimal compactive effort. The aggregate composition comprises about 75% igneous crushed rock, about 5% processed round silica sand particles, about 20% recycled asphalt pavement, and about 5% binder. The resultant pavement is skid-resistant, resists rutting, and has a permanent dark color.

主权项

1. A hot-mix asphalt paving mixture, comprising:
(a) an aggregate composition including, by weight:
(1) 70% to 80% hard angular non-carbonate crushed igneous rock having a size of about ½″ minus, said igneous crushed rock being selected from the group consisting of rhyolite, porphyry, granite, diabase, dolerite, and basalt;(2) 3% to 10% washed processed rounded silica sand having a size distribution predominately in the range of a No. 100 sieve; and(3) 20% to 25% recycled asphalt pavement having a size distribution less than ½″ minus; and (b) a performance-graded virgin asphalt bituminous binder having an initial temperature of about 314° F. to 335° F., the quantity of said asphalt binder being from 3.5% to 5.5%, by weight, of the mixture, whereby the mixture is easily compacted, and the resultant pavement, produced primarily from by-products, is skid-resistant, rut-resistant, and has a permanent black appearance.