含再生骨料和粉煤灰的多孔沥青混合料性能研究

Study on the Properties of Porous Asphalt Mixtures Containing Recycled Aggregate and Fly Ash

文中研究了再生混凝土骨料(RCA)和C型粉煤灰对多孔沥青混合料整体性能的影响。试验室制备RCA和粉煤灰不同组合的混合料,测试分析多种性能参数,包括空隙率、渗透性、马歇尔稳定度、间接抗拉强度、水稳定性、宏观构造深度。结果表明,排水性沥青混合料掺入RCA或粉煤灰,其空隙率、渗透性和表面宏观构造深度略微降低。多孔沥青混合料用RCA替代10%的花岗岩集料,其稳定性、间接抗拉强度等性能降低。然而,混合料用粉煤灰进一步取代矿物填料,有助于抵消RCA的负面影响,RCA为10%时的混合料力学性能达到与对照混合料相当的水平。

The effects of recycled concrete aggregate(RCA)and type C fly ash on the overall properties of porous asphalt mixture are studied in this paper.Mixtures of different combinations of RCA and fly ash were prepared in the laboratory and tested for a variety of performance param-eters,including porosity,permeability,Marshall stability,indirect tensile strength,water stability,and macroscopic structural depth.The re-sults show that the addition of RCA or fly ash to the drainage asphalt mixture slightly reduces the porosity,permeability and surface macrostruc-ture depth of the mixture.The substitution of RCA for 10%granite aggregate in porous asphalt mixture leads to the reduction of mixture stabili-ty,indirect tensile strength and other properties.However,further substitution of the mineral filler with fly ash in the mixture helped to coun-teract the negative effects of RCA and brought the mechanical properties of the mixture with an RCA of 10%to comparable levels to those of the control mixture.