利用垃圾废料制备透水混凝土试验研究

首先利用碱激发剂激发大掺量粉煤灰的活性,确定激发大掺量粉煤灰(40%)活性的Na2SiO3和Ca(OH)2的掺量;然后将废弃混凝土破碎,作为粗骨料取代部分天然碎石,以大掺量粉煤灰作为胶凝材料配制透水混凝土。结果表明:激发大掺量粉煤灰(40%)活性的单掺Na2SiO3最佳掺量为4%、单掺Ca(OH)2最佳掺量为2.5%;复掺最佳掺量为4%Na2SiO3+2.5%Ca(OH)2。再生粗骨料取代碎石的最佳取代率为20%。制备的透水混凝土坍落度为24 mm,28 d抗压强度为31.34 MPa,透水系数为2.29 mm/s,连续孔隙率达到14.4%。

Experimental research on the development of permeable concrete by using solid waste

Firstly,the activity of the large amount of fly ash is excited by the alkali activator,and the amount of Na2SiO3 and Ca(OH)2 which activates the activity of the large amount(40%)of fly ash is determined;then the waste concrete is broken and used as the coarse aggregate instead of a part of natural gravel,a high volume of fly ash is used as a cementing material to prepare permeable concrete.The experimental results show that the optimal blending amount of single-doped Na2SiO3 with high activity(40%)fly ash is 4%,and the optimum content of single-doped Ca(OH)2 is 2.5%;The optimum dosage of the composite Na2SiO3+Ca(OH)2 is 4%+2.5%.The optimum substitution rate of recycled aggregate in place of crushed stone is 20%.The prepared permeable concrete slump is 24 mm,the 28 d compressive strength is 31.34 MPa,the water permeability coefficient is 2.29 mm/s,and the continuous porosity is 14.4%.