粗集料针片状颗粒含量对沥青混合料性能的影响

Influence of Content of Needle and Plate Particles in Coarse Aggregate on Properties of Asphalt Mixture

从集料的加工特性来分析针片状颗粒产生的原因,以及针片状颗粒含量对沥青混合料在施工和使用过程中的影响,主要从集料压碎值、沥青混合料抗剪强度、高温稳定性、水稳定性等几个方面进行研究。结果表明,针片状颗粒含量对混合料性能的影响比较大,针片状颗粒容易断裂、混合料不容易压实、骨架结构的抗车辙能力下降、水稳性下降,因此应该严格控制针片状颗粒的含量。

The causes of needle and plate particles are analyzed from processing characteristics of aggregates,the influence of content of needle and plate particles in coarse aggregate on the construction and usage of asphalt mixture are studied from the aspects of aggregate crushing value,shear strength of asphalt mixture,high temperature stability and water stability.The results show that the content of needle and plate particles has great influence on the properties of asphalt mixture.Because the needle and plate particles are easy to break,the mixture is not easy to be compacted,and the rutting resistance and water stability will reduce,the content of needle and plate particles should be controlled strictly.