含炭硅质岩在高速公路沥青路面表面层适用性研究

Research on Applicability of Carbon-bearing Siliceous Rocks to Surface Layer of Asphalt Pavement of Expressway

高速公路沥青路面表面层建设对石料的需求量巨大,对其性能要求也较为苛刻。含炭硅质岩尚无应用于高速公路沥青路面表面层的先例。文章针对江西省芦溪县产含炭硅质岩矿石,从微观和宏观角度对其化学成分、微观形态、酸碱性、集料技术指标、混合料路用性能进行系统分析。研究结果表明含炭硅质岩虽然主要成分为二氧化硅,呈酸性,但与沥青具有良好的黏附性能,集料各项技术指标均能满足规范要求,且混合料各项路用性能（包括水稳定性）良好。因此含炭硅质岩应可作为高速公路沥青路面表面层用集料,而集料酸碱性并不成为适用性的决定性条件。文章研究成果为扩展高速公路沥青路面集料选取范围做了有益的探索,为相关道路工程的就近取材提供了理论依据。

Asphalt pavement construction demands huge amounts ofgood-quality stones. In this paper, the chemical composition, microcosmic morphology, acidity and alkalinity, aggregate technical properties and asphalt mixture performance of carbon-bearing siliceous rocks are analyzed systematically from micro and macroscopic angles. The results show that they are silicic acid, but adhere well with asphalt. The aggregate technicalproperties and road performance of the asphalt mixture are good. Therefore, these rocks could be used as aggregates for the surface layer of asphalt pavement, and the acidbase property of aggregates is not a decisive condition for the suitability. The results of this paper provide the necessary theoretical basis for the expansion of the selection range for the aggregates in asphalt pavementof expressway.