Study on the Preparation and Properties of Pervious Concrete of Coal Gangue for Washing
Using washing coal gangue to prepare permeable concrete,a three factor three-level orthogonal experiment was designed to investigate the effects of aggregate gradation,water cement ratio,and bone cement ratio on the performance of specimens.The results show that the influence of all factors on mechanical properties and permeable properties of washing coal gangue pervious concrete is consistent in the order of water-cement ratio>bone glue ratio>aggregate gradation;There is a negative correlation between compressive strength and water permeability;When the proportion of fine aggregate of washing coal gangue is50%,the water-cement ratio is0.32,and the bone glue ratio is 2.7,the 28 days compressive strength can reach 12.11 MPa.The relative content of CH and AFt crystals in interface transition zone(ITZ)area is relatively large,indicating a weak area and a higher likelihood of cracking,suggesting a lower degree of hydration reaction in this region.The larger the porosity of pervious concrete is,the more significant the freeze-thaw damage degree is.
万方数据
维普
