清水混凝土抗裂性能研究

Research on Cracking Resistance of Plain Concrete

清水混凝土建筑带有艺术性质,产生裂缝会对清水混凝土外观造成极大影响,为此,将各种提升清水混凝土抗裂性能的办法以配合比、掺合料、骨料等进行分类,在此基础上,对未来研究方向进行展望,需厘清水胶比、砂率和粗集料含量三者的关系,给出最优的初步配合比,粉煤灰、石灰石粉能提高清水混凝土的抗裂性能,矿渣、硅灰粉则对清水混凝土的抗裂性能有不利影响,内养护技术可考虑掺加SAP高吸水树脂,自修复技术可考虑微生物+膨胀珍珠岩,建议在清水混凝土中采用优质骨料。

Architectural exposed concrete has an artistic nature,so cracks greatly compromise its appearance.This article classifies various methods to improve crack resistance of architectural exposed concrete in terms of mix proportion,admixtures and aggregates.On this basis,future research directions are discussed.The relationships of water-binder ratio,sand ratio and coarse aggregate content should be clarified to determine the optimal initial mix proportion.Fly ash and limestone powder help improve crack resistance,while slag and silica fume are detrimental.For internal curing,SAP superabsorbent resin can be considered.For self-healing,microorganisms and expanding perlite are options.Quality aggregates are recommended for architectural exposed concrete.