高耐久性混凝土优化配比试验研究  

Experimental Research on the Ratio Optimization of High Durability Concrete

作　　者：潘自林 顾靖超 陆立国 PAN Zi-lin;GU Jing-chao;LU Li-guo(Ningxia Hydraulic Engineering Construction Center,Yinchuan 750004,China;Ningxia Institute of Hydraulic Research,Yinchuan 750021,China)

机构地区：[1]宁夏水利工程建设中心,银川750004 [2]宁夏水利科学研究院,银川750021

出　　处：《中国农村水利水电》2021年第7期215-221,共7页China Rural Water and Hydropower

基　　金：国家重点研发计划项目(2016YFC0402900);宁夏回族自治区重点研发计划重大项目(2018BBF02022);国家自然科学基金项目(51809143);宁夏自然科学基金项目(2018AAC03041)。

摘　　要：陕甘宁革命老区供水工程属于强腐蚀环境,传统的以强度为目标,确定基准配合比后复验混凝土各项性能并予以优化的混凝土配合比设计方法,难以满足工程的耐久性要求。研究了不同水胶比、水泥品种、含气量、掺合料品种及其配比对混凝土强度、抗渗、抗冻、抗碳化以及抗氯离子和硫酸盐侵蚀等耐久性能的影响。混凝土配合比优化配比试验结果表明:水胶比0.31、50%普硅42.5水泥+30%矿粉+20%粉煤灰的引气混凝土配合比(56 d)性能可以达到C40F200W8KS150设计指标,抗渗等级超过W12,60 d快速碳化深度小于20 mm,抗冻等级≥F200,抗碳化性能可满足大气环境下(碳化)50 a的耐久性要求;硫酸盐侵蚀环境(Y3)下设计使用年限级别为100 a;氯盐环境(L2)下设计使用年限级别为100 a。The water supply projects are exposed to highly corrosive environment in the old revolutionary base areas such as Shaanxi,Gansu and Ningxia.The effects of different water-binder ratios,cement types,gas content,admixtures and their ratios on the durability of concrete performance are studied,such as strength,impervious resistance,frost resistance,carbonization resistance,chloride ion and sulfate erosion resistance.The results show that when the water/cement ratio is 0.31/50%,the mix proportion of ordinary Portland cement,mineral powder and fly ash is 5∶3∶2,the comprehensive performance of the durability air-entraining concrete is optimal.The design index(56 d)can achieve C40F200W8KS150,impervious resistance grade is more than W12,60 d rapid carbonization depth is less than 20 mm,frost resistance grade is over F200,and carbonation resistance can meet the atmospheric environment(carbide)50 a durability requirements.Meanwhile,the design service life level is 100 a under sulphate environment(Y3)or chlorine environment(L2).

关 键 词：强腐蚀环境 高耐久性 混凝土 配合比 试验优化 

分 类 号：TV93[水利工程—水利水电工程]