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混凝土耐久性一直是影响建筑物安全运行效能和寿命的关键,各种收缩引起的开裂问题更是水工混凝土结构物防裂控制的重点和难点。本文结合南水北调大型渡槽高性能混凝土配合比试验,通过对多元材料组合混凝土的试验研究、特别是抗裂性能,采用圆环抗裂等试验方法进行了研究,优选提交的施工配合比满足了大体积薄壁结构高性能混凝土的施工浇筑以及抗裂、抗渗等耐久性要求。
The durability of concrete has always been the key factor that affects the safety performance and life span of buildings. The cracking problems caused by various shrinkage are the key and difficult points in the crack prevention and control of hydraulic concrete structures. In this paper, combined with large-scale aqueducts of South-to-North Water Transfer high-performance concrete mix ratio test, through the experimental study of multi-material composite concrete, especially the crack resistance, using ring crack test methods were studied, preferably submitted construction mix to meet the large volume Construction of thin-walled high-performance concrete pouring and anti-cracking, impermeability and other durability requirements.