Mechanical properties and microscopic characteristics of steel fiber coal gangue concrete

Incorporation of coal gangue in the concrete mixes can realize utilization solid waste and reduce extraction/use natural aggregates. To improve mechanical properties concrete, this paper studies use steel fibre together with coarse aggregate, fine aggregate/sand various mixes. The effect volume dosages different levels replacing nature aggregate river sand aggregates on compressive strength was first investigated. Then, a design experiment using orthogonal test adopted to study 3 factors, namely, fibre, each at levels. Through multidimensional statistical data analysis results, primary secondary factors optimal composition reinforced were identified, grey prediction model for established. microstructural characteristics failure mechanism fiber also studied discussed.