International Reports
| Report No. | CP22 (jot this number down to order) |
| Title | Low Temperature Performance of Scrap Tire Rubber Modified Asphalt Concrete |
| Authors | Hesp, Simon, Queens University |
| Publisher | Ontario Ministry of Transportation |
| Pub. Date | |
| Pages | 34 pages |
| Keywords | |
| Description | The low temperature performance of rubber-modified asphalt concrete systems was investigated through thermal stress restrained speciment tests. Low temperature TSRST tests on surface grafted, regular crumb rubber-modified and unmodified asphalt concrete mixes yielded similar results. The small improvement for the rubber-modified systems can be attributed to a reduction in the stiffness of the binder. The failure temperature for a mix prepared according to the wet process with 1% extra binder was an impressive 15-degree colder than the control. The improvement is mainly due to the high binder content and a resulting lower stiffness. The addition of 20-wt %40 mesh rubber to the binder in an SMA design did reduce the fracture temperature but the effect was not as large as for the wet process. Partial devulcanization or disintegration of crumb rubber in hot asphalt binders utilizing high shear and heat can produce finely dispersed rubber-asphalt systems with improved high temperature performance. The devulcanization or disintegration process should also be environmentally friendly and it should not oxidize the binder. |
| Postage | $ 4.00 : U.S. $ 4.20 : Canada/Mexico $ 4.40 : Rest of the World |
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