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RESULTS OF ROAD TRIALS OF TWO ASPHALT ANTIOXIDANTS.
| 题名： | RESULTS OF ROAD TRIALS OF TWO ASPHALT ANTIOXIDANTS. |
| 作者： | Oliver-JWH |
| 关键词： | LABORATORY-TESTS; ANTIOXIDANTS-; LEAD-DIAMYLDITHIOCARBAMATE; HYDRATED-LIME; ASPHALTS-; BINDERS-; ASPHALT-HARDENING; REDUCTION-DECREASE; FIELD-TESTS; SEAL-COATS; SPRAYED-COATINGS; TEST-SECTIONS; MONITORING-; VISCOSITY-; PERFORMANCE-EVALUATIONS; CLIMATIC-CONDITIONS |
| 摘要： | Laboratory testing indicated that two antioxidants, lead diamyldithiocarbamate (LDADC) and hydrated lime (HL), were effective in reducing the rate of oxidative hardening of asphalt binders. Road trial sections with sprayed seals of both materials were placed at a number of sites in Australia and were monitored for up to 10 years. Each trial consisted of a number of sections that were identical to each other except for the concentration of antioxidant incorporated into the asphalt. The trials were regularly inspected and sampled. Samples were taken back to the laboratory, the asphalt binder was recovered, and its viscosity was measured. By comparing the viscosities of sections onto which asphalt binders containing antioxidant were laid with control sections (asphalt only, no additive) it was possible to determine how effective the antioxidant was in reducing asphalt hardening. The results suggest that LDADC gives the greatest benefit in pavement situations in which binder hardening is rapid. The addition of more than 2.5% LDADC appears to produce substantial reductions in the hardening rate. When binder hardening occurs slowly (a durable asphalt in a temperate climate) the addition of LDADC does not appear to reduce binder hardening rate. Although HL was found to retard the rate of hardening of a range of asphalts under laboratory test conditions, it was shown to have no significant effect under long-term exposure (up to 10 years in a sprayed seal). |
| 总页数： | Transportation Research Record. 1995. (1488) pp96-102 (7 Fig., 5 Tab., 13 Ref.) |
| 报告类型： | 科技报告 |
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