Affiliation:
1. Department of Chemical Engineering and The Texas Transportation Institute, Texas A&M University, College Station, Tex. 77843-3122
Abstract
A curing study was undertaken to determine the effect that asphalt composition, rubber content, rubber mesh size, curing time, curing temperature, and rate of mixing have on asphalt-rubber properties. Curing temperatures of 232°C or 260°C (450°F or 500°F) and a high-shear laboratory mixer were used to produce the asphalt-rubber blends. The properties studied were rubber dissolution; rubber settling; molecular weight distribution; and low-, intermediate-, and high-temperature rheological properties. Increasing the curing temperature from 232°C to 260°C (450°F to 500°F) drastically increased the rate of devulcanization and depolymerization of the rubber, whereas increasing the rate of mixing from 4,000 rpm to 8,000 rpm drastically decreased the settling rate of rubber in a binder. Lower-molecular-weight asphalts were better at devulcanizing the rubber; higher-molecular-weight asphalts were better at depolymerizing the rubber. These high-cure binders are homogeneous in appearance and slow to phase separate on standing; they have acceptable compaction viscosities at hot-mix temperatures, higher G*/sinδ at rutting temperatures, and lower stiffness at cold temperatures than does the base asphalt.
Subject
Mechanical Engineering,Civil and Structural Engineering
Reference11 articles.
1. FrantaI. Elastomers and Rubber Compounding Material. Elsevier, New York, 1989, pp. 302–315.
Cited by
55 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献