粗集料含泥量对沥青混合料水稳定性的影响

Influence of Mud Content of Coarse Aggregate on Water Stability of Asphalt Mixture

粗集料含泥量对沥青混合料水稳定性的影响较大,为了进一步研究不同含泥量的沥青混合料水稳定性能差异,基于水损坏机理,通过浸水马歇尔、冻融劈裂及黏附性等室内试验,研究不同含泥量对沥青混合料水稳定性的影响。结果表明:粗集料中含泥条件下的混合料水稳定性能较差,并且随着粗集料含泥量的增大,沥青与集料之间的黏附性等级逐渐降低,最终导致混合料水稳定性能不足。

The mud content of coarse aggregate has large intluence on water stability of asphalt mixture. In order to further study the differenc, e of water stability of asphalt mixture with different mud contents, the influence of different mud contents on water stability of asphalt nlixture is studied based on water damage mechanism and laboratory tests like hnmersion Marshall Test, freeze -thaw splitting and adhesiveness and so on. The conclusion shows that： the water stability of mixture under the condition of coarse aggregate with mud is poor; and with the increase of mud content of coarse aggregate, the adhesiveness grade between asphah and aggregate is gradually reduced, thus uhimatelv causing the deficiency of water stability of mixture.