掺固硫灰AC-13型沥青混合料配合比设计

Mix design of AC-13 asphalt concrete with circulating fluidized bed combustion ash

固硫灰是循环流化床锅炉燃煤固硫产生的废弃物,具有自硬性、火山灰活性和膨胀性等特性,若以其替代矿粉制备沥青混合料并用于道路工程建设中,将有望为固硫灰处理处置提供新途径。选用固硫灰做填料等量替代普通矿粉,通过马歇尔实验研究固硫灰不同替代量(0%、25%、50%、75%、100%)对AC-13型沥青混合料性能的影响,并对机理进行了分析。结果表明,掺固硫灰沥青混合料在一定油石比范围内均能满足现行规范要求,与普通矿粉沥青混合料相比,掺固硫灰沥青混合料水稳定性良好,压实度相同时,掺固硫灰沥青混合料具有更好的抗车辙性。

As a solid waste generated by circulatmg tluldlzed bed combustion, circulanng ilumlzeu Deo combustion fly ash （CFBA） has characteristics of self-harding, pozzolanic activity and expansibility. In this study, CFBA was used to prepare asphalt concrete mixtures with mineral powder replacement ratio of 0% , 25% , 50% , 75% and 100% , respectively. The properties of these asphalt concretes were researched through Marshall tests, and the mechanism was also analyzed. Results showed that asphalt mixture with different percentages of CFBA could meet the demand of the current standard in certain asphalt-aggregate ratio range. Compared with the limestone dust asphalt mixture, CFBA asphalt mixture had better water stability and resistance to rutting at the same compaction degree.