- 向佳瑜，李 曦，蒋 震，冷 政，袁吉童
引用本文摘 要：分析了湖南区域三个混凝土预拌厂废水的理化性质，采用该废水制备了C20~C60混凝土来研究废水对混凝土工作性能、力学性能和关键耐久性能的影响，并在相关指标满足工程应用的要求后，将其应用于工程中。研究表明，三个预拌厂产生的废水及其沉淀废渣各项理化性质相似，成分接近，主要以SiO2、Al2O3和CaO为主。沉淀废渣粒径较小可以改善混凝土体系的颗粒级配；各强度等级的混凝土在废水的最优掺量上存在差异，C30混凝土废水掺量在50%表现出较为优异的工作性，且废水对于中高强度等级混凝土的抗压强度未发现不利的影响；废水可降低混凝土的电通量和提高抗碳化性能，C60废水混凝土6 h总电通量为300 C左右，碳化深度随着废水掺入量的增加而减少。 bstract: According to physical and chemical properties analysis of three concrete mixing stations in Hunan area, the C20~C60 concrete were prepared by adding waste water to study the effects of waste water on working performance, mechanical performance and critical durability of the concrete. The concrete was applied to engineering after relevant indicators met the requirements. The results show that physical and chemical properties of the waste water and sediment residue produced by the three mixing station are similar, and the main composition is SiO2, Al2O3 and CaO. The small particle size of sediment residue can improve the particle gradation of concrete. The concrete with different strength grade has different optimal content of waste water. The 50% waste water content of C30 concrete has excellent working performance, and waste water has no adverse effect on the compressive strength of medium and high strength grade concrete. Waste water can reduce concrete electric flux and improve carbonation resistance. The 6 h total electric flux of C60 concrete by waste water is about 300 C, and the carbonation depth decreases with the increase of the content of waste water.