高强混凝土内养护的研究进展

Abstract

高强高性能混凝土在各类建筑工程中被广泛地应用。但由于高性能混凝土水胶比较低、胶凝材料用量较大，其早期的自收缩较为严重，从而产生微裂纹进而开裂，严重影响其力学性能和耐久性。而内养护技术依靠预吸水材料释放水分维持混凝土内部充分湿润，可以有效地减少自收缩，保障混凝土的力学性能和耐久性。本文从内养护剂的作用机理、内养护剂的种类、不同内养护剂的作用效果对比以及内养护剂的工程应用等方面总结了近年来高强混凝土内养护的研究进展。 High-performance concrete is widely applied to all kinds of building and construction projects. Due to the low water to binder ratio and large amount of cenmentitious materials, the autogenous shrinkage of high-performance concrete is significantly severe, thus resulting in microcracks and even cracking. So the mechanical properties and durability of concrete are seriously impacted. The internal curing technology relies on the pre-absorbent materials to release moisture to maintain sufficient internal wetting of the concrete, which can effectively reduce the autogenous shrinkage and ensure the mechanical properties and durability of the concrete. This paper has summarized the research progress in internal-curing of high strength concrete in recent years from the aspects of the working mechanism of the internal curing reagents, the types of the internal curing reagents, comparison of the effect of different internal curing reagents and the engineering application of the internal curing reagents.