煤矸石粉沥青胶浆路用性能及微观机理研究

Research of Road Performances and Microcosmic Mechanisms of Coal Waste Powder Asphalt Mortar

为了拓宽煤矸石加工再利用的途径,探究其在道路工程中的应用前景,采用5种粉胶比制备了分别掺入煤矸石粉(CWP)、煤矸石灰(CWA)和石灰岩(LS)3种填料的沥青胶浆,对其路用性能进行了对比研究,并对煤矸石粉沥青胶浆的微观机理进行了分析.结果表明:与矿粉相比,煤矸石粉尤其是煤矸石灰颗粒更细,比表面积更大,表面更粗糙,并且含有更多的活性矿物成分和孔隙结构,提高了与沥青的黏结力;煤矸石粉和煤矸石灰的孔隙吸收了沥青中的轻质组分,使胶质和沥青质的相对含量增大,从而显著提高了沥青胶浆的高温稳定性能,并改善了感温性,但其低温性能有所降低.

To broaden the way of utilizing coal waste,explore its application prospect in road engineering,coal waste powder(CWP),coal waste ash(CWA)and limestone(LS)powder were used to prepare asphalt mortar with 5 kinds of filler-asphalt ratios.Technical performance tests were conducted to compare the road performance of different asphalt mortar.Furthermore,microscopic tests were conducted to analyse the microcosmic action mechanisms of coal waste powder asphalt mortar.The results show that compared with limestone powder,CWP and especially CWA particles are finer,the surface is rougher and the specific surface area is larger,and which contain more active mineral contents and poring structure,thereby the adhesion of filler-asphalt is improved.In addition,the pores of CWP and CWA can absorb light components in asphalt,which resulting the relative contents of colloid and asphaltene in asphalt increase,thus apparently improving the high temperature property and temperature sensitivity of asphalt mortar,but the low-temperature performance of asphalt mortar is slightly reduced.