ABSTRACT

Ceramsite epoxy asphalt mixture (CEAM) was prepared by adding ceramsite (CS) to replace aggregate with 0%, 16%, 41%, and 63%. The thermal stability of epoxy asphalt (EA) and CS, and their adhesion were analysed. Laboratory tests were performed to assess the mechanical properties and thermal resistance of CEAM compared with styrene–butadiene-styrene (SBS) copolymer modified asphalt. Results indicate that EA has good stability and adhesion to CS under high-temperature conditions. The air-void content of CEAM gradually increases, and the density gradually decreases with an increase in CS content. The strength, high-temperature stability, moisture resistance, and low-temperature performance of CEAM are slightly affected by the CS content, significantly different from those of the SBS-modified asphalt mixture. Adding CS can significantly improve the thermal resistance of CEAM. In addition, through the performance analysis of CEAM under two laboratory compaction levels, it is found that compared with high compaction level, CEAM under light compaction level has higher strength, better high-temperature stability, and thermal resistance due to more stable aggregate gradation and higher air-void content. Therefore, the light compaction level is the recommended compaction method for the CEAM.

摘要

陶粒环氧沥青混合料（CEAM）通过添加陶粒（CS）代替骨料分别为0％，16％，41％和63％来制备。分析了环氧沥青（EA）和CS的热稳定性及其附着力。与苯乙烯-丁二烯-苯乙烯（SBS）共聚物改性沥青相比，进行了实验室测试以评估CEAM的机械性能和耐热性。结果表明，EA在高温条件下具有良好的稳定性和对CS的粘附性。随着CS含量的增加，CEAM的气孔含量逐渐增加，密度逐渐降低。CS含量对CEAM的强度，高温稳定性，耐湿性和低温性能的影响很小，这与SBS改性沥青混合料的CS含量显着不同。添加CS可以显着提高CEAM的耐热性。另外，通过对两种实验室压实水平下的CEAM的性能分析，发现与高压实水平相比，轻压实下的CEAM具有更高的强度，更好的高温稳定性以及更稳定的骨料级配和耐热性。较高的气孔含量。因此，轻压实等级是CEAM推荐的压实方法。