基于灰关联熵分析法的沥青混合料抗裂性能影响因素分析

Crack Resistance Factor of Asphalt Mixture Based on the Grey Relation Entropy

对于刚柔复合式路面结构而言,沥青混合料上面层极易产生反射裂缝,为了研究沥青混合料本身具有的抗反射裂缝的能力,采用OT试验方法,基于灰关联分析法分析五种不同的沥青混合料类型、不同体积指标(空隙率)以及试验温度对沥青混合料抗裂性能的影响。研究结果表明:灰关联熵分析法要比灰关联法更加科学;密级配沥青混合料比粗级配沥青混合料表现出较好的抗裂性能;采用OT方法评价沥青混合料抗裂性能时,断裂参数荷载峰值的大小与破坏荷载循环周期没有明显的关系,荷载循环周期并不依赖荷载峰值,因此荷载峰值的大小不能作为沥青混合料抗裂性能大小的指标;在集料种类、粒径大小、沥青种类确定的情况下,沥青混合料的抗裂性能影响因素的抗裂效果:混合料类型>沥青用量>空隙率。

For rigid-flexible Composite Pavement Construction, asphalt mixture layer above produces reflection could crack easily. In order to analyze the reflection crack resistance of asphalt mixture, by using overlay tester, crock resistance property of five asphalt mixture types were analyzed based on the grey relation analysis in this paper. The influence of mixture types, temperature and volume index （void ratio） on the anti-cracking performance of asphalt mixture was analyzed. Results show that grey relation entropy analysis is more scientific than grey relation. The dense-graded HMA （AC- 13,CAM,SMA - 13 and Super pave- 13） generally exhibited good cracking resistance than open-graded HMA（OGFC- 13）. Based on the Overlay tester, there is no distinctive relationship between the peak load and OT cycles. This indicated that OT cycles was not necessarily dependent on the peak load. Similarly the magnitude of the peak load could not be used as an indicator of the HMA mix cracking resistance. When the aggregate type, particle size, types of asphalt have been confirmed, the influence degree of factors on cracking resistance effect is mixture type 〉 asphalt content 〉 porosity.