- 向佳瑜，李 曦，蔣 震，冷 政，袁吉童
引用本文摘 要：分析了湖南區域三個混凝土預拌廠廢水的理化性質，采用該廢水制備了C20~C60混凝土來研究廢水對混凝土工作性能、力學性能和關鍵耐久性能的影響，并在相關指標滿足工程應用的要求后，將其應用于工程中。研究表明，三個預拌廠產生的廢水及其沉淀廢渣各項理化性質相似，成分接近，主要以SiO2、Al2O3和CaO為主。沉淀廢渣粒徑較小可以改善混凝土體系的顆粒級配；各強度等級的混凝土在廢水的最優摻量上存在差異，C30混凝土廢水摻量在50%表現出較為優異的工作性，且廢水對于中高強度等級混凝土的抗壓強度未發現不利的影響；廢水可降低混凝土的電通量和提高抗碳化性能，C60廢水混凝土6 h總電通量為300 C左右，碳化深度隨著廢水摻入量的增加而減少。 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.