煤矸石粉填料改性沥青混合料可行性研究  

Feasibility Study on Modified Asphalt Mixture with Coal Gangue Powder Filler

作　　者：华冰 王立朋 HUA Bing;WANG Lipeng(China Railway 19th Bureau Group 5th Engineering Co.Ltd.,Dalian Liaoning 116000,China)

机构地区：[1]中铁十九局集团第五工程有限公司,辽宁大连116000

出　　处：《铁道建筑技术》2024年第12期34-37,共4页Railway Construction Technology

基　　金：中铁十九局集团有限公司科技研究开发项目(2022-B05)。

摘　　要：煤矸石是煤炭开采过程中产生的一种废弃物,产量巨大。因不易燃烧而缺乏有效利用,导致堆积量巨大,其含有的重金属对环境造成严重污染。目前已有文献将煤矸石作为建筑材料用以填筑路基等。为探究煤矸石粉(CGP)作为填料改性沥青混合料的可行性,对煤矸石粉与石灰石粉(LS)通过试验进行对比分析,探究煤矸石粉物理特性、化学特性、孔隙特性及表面特性。结果表明:煤矸石粉粒径更小,其中小于0.02 mm的粒径占比为30.23%,而石灰石粉小于0.02 mm的粒径占比仅为2.78%;煤矸石粉具有更大的比表面积,较石灰石粉增大2.11 m^(2)/g;煤矸石粉表面构造粗糙,含有鳞片状结构,而石灰石粉表面则相对光滑;煤矸石粉SiO_(2)和Al_(2)O_(3)活性物质含量是石灰石粉的8倍左右。这些指标表明煤矸石粉物化性质优异,具备填料改性潜力,因此煤矸石粉可作为填料改性沥青混合料,在提升沥青混合料路用性能的同时提高煤矸石利用率,有助于减少占地和保护环境。Coal gangue is a kind of waste produced in the process of coal mining,and the output is huge.Because it is not easy to burn and lack of effective use,resulting in a huge amount of accumulation,which contains heavy metals caused serious pollution to the environment.At present,there are existing literatures on the use of coal gangue as building materials to fill the roadbed and so on.In order to explore the feasibility of using coal gangue powder(CGP)as a filler to modify asphalt mixtures,this paper compares and analyzes coal gangue powder with limestone powder(LS),and explores the physical,chemical,pore,and surface properties of coal gangue powder.The results show that the diameter of the coal gangue powder particles is smaller,and the particle size of coal gangue powder is less than 0.02 mm,accounting for 30.23%,while the particle size of limestone powder is less than 0.02 mm,accounting for only 2.78%.Coal gangue powder has a larger specific surface area,increasing by 2.11 m^(2)/g compared with limestone powder.The surface of coal gangue powder is rough and contains scaly structure,while the surface of limestone powder is relatively smooth.In addition,the content of SiO_(2) and Al_(2)O_(3) active substances in coal gangue powder is about 8 times that of limestone powder.These indicators show that coal gangue powder has excellent physical and chemical properties and has the potential of filler modification.Thus,the filler of the modified asphalt mixture can be replaced by coal gangue powder,which can improve the road performance of the asphalt mixture and improve the utilization rate of coal gangue,and help to reduce the land occupation and protect the environment.

关 键 词：煤矸石粉 物理特性 微观结构 填料改良 尾矿利用 

分 类 号：U414[交通运输工程—道路与铁道工程]