固体废弃物在混凝土中的应用研究

Application Study of Solid Waste in Concrete

以破碎的废混凝土作为替代粗骨料,冶炼渣作为替代细骨料,通过试验研究了粗骨料和细骨料在不同替代率的情况下混凝土的性能以及掺合料对混凝土性能的影响.研究表明:随着替代粗骨料替代率的增加混凝土的抗压强度、抗氯离子渗透性能也随之有少量的降低,适当掺量的冶炼渣替代细骨料可以提高混凝土的抗压强度和抗氯离子渗透性,但掺量过大反而使混凝土的抗压强度和抗氯离子渗透性降低.掺合料的加入会提高混凝土的抗压强度、降低氯离子扩散系数,对混凝土的耐久性有明显的改善.

By using broken waste concrete as substitution coarse aggregate and slag as a substitution for fine aggregate, the performance of the concrete with different replacement ratios of coarse and fine aggregates as well as the influence of mineral admixture is studied. The results showe that with the increase of substitued coarse aggregate replacement rate, the compressive strength and resistance to chloride ion permeability of the concrete are reduced slightly. Substitution fine aggregate can improve the compressive strength and resistance to chloride ion permeability with appropriate ratio while a larger amount of it will cause poor performance. The mineral ad- mixture can improve the compressive strength and reduce the chloride ion diffusion coefficient, which improves the durability of the concrete obviously.