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Testing and Analysis of LWT and SCB Properties of Asphalt Concrete Mixtures. Tech Summary.
| 题名： | Testing and Analysis of LWT and SCB Properties of Asphalt Concrete Mixtures. Tech Summary. |
| 作者： | Cooper, S. B.; King, W.; Kabir, S. |
| 关键词： | Asphalt mixtures, Pavement construction, Loaded wheel tester(LWT), Semi-circular bend (SCB) test, Balanced mixture design, Laboratory performance, Concrete mixtures, Durability analysis |
| 摘要： | For pavement to perform well in the fi eld, a balance of both rut and crack resistance in response to the traffi c loads and environment conditions is required. Controlling volumetric properties of a hot mix asphalt (HMA) mixture is not enough to ensure good pavement performance because pavements often do not perform as they are designed. DOTD specifi cations were designed to target rutting as the major distress impacting Louisiana roadways. However, an adverse eff ect of that specifi cation was the production of “dry” mixtures. The reduced asphalt content in the mixtures resulted in questionable durability of the roadway. A possible solution would be the development of laboratory test procedures to evaluate the as-built pavement-qualities to predict the pavement performance and life. In so doing, numerous agencies around the United States are incorporating mechanical tests to evaluate the rutting potential, cracking potential, and moisture susceptibility of HMA mixtures. Recent DOTD specifi cation changes were implemented and evaluated using semi-circular bending (SCB) and loaded wheel tracking (LWT) tests. The results of these specifi cations were used to implement balanced mixture design practices. This study evaluated the use of the LWT and SCB tests as end result parameters to indicate the stability and durability of HMA mixtures. As part of this study, an attempt was made to develop a simplifi ed and reasonable SCB test procedure so that the commonly used Marshall Load frame device would be adapted for plant and district laboratory testing. |
| 总页数： | Cooper, S. B.; King, W.; Kabir, S. |
| 报告类型： | 科技报告 |
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