Review on the Microstructure Formation Mechanism in Concrete MaterialUnder Different Curing Regimes
ZHANG Gaozhan1,2, GE Jingcheng1, ZHANG Chunxiao3, YANG Jun1,2, LIU Kaiwei1,2, WANG Aiguo1,2, SUN Daosheng1,2
1 School of Materials and Chemical Engineering, Anhui Jianzhu University, Hefei 230601, China 2 Anhui Province Key Laboratory of Advanced Building Materials, Hefei 230022, China 3 Institute of Engineering Protection, IDE, AMS, PLA, Luoyang 471023, China
Abstract: Curing regime is the key factor that affects the microstructure formation in concrete and further determines the performance of this material. As early as the 1960s, scholars at home and abroad started to improve the concrete performance through the variation of curing temperature and humidity. However, due to the singleness of this variable, its improvement on the concrete performance is limited. With the advent and deve-lopment of modern concrete technology, curing techniques such as steam and autoclaved curing emerges, which meet the requirement to simultaneously control the curing temperature, humidity and even pressure. Steam curing and autoclaving can promote the rapid growth of concrete strength, meeting the early strength requirement in engineering and reducing the construction period. At the micro-level, steam curing and autoclaving can accelerate the C-S-H gel formation in concrete, which contributes to its strength development at the macro-level. After longer time in autoclaved curing environment, C-S-H gel in concrete can transform to tobermorite crystals with high-strength and density, which further improves the mechanical strength of concrete. However, during the fast strength growth for concrete in steam and autoclaved curing, it also undergoes the problem of large porosity, increa-sing number of micro-cracks and decreasing performance in the interface transition zone, which could affect the long-term durability of concrete. By the measures of decreasing water to binder ratio, adding mineral admixtures in cement-based material, prolongating curing time and exerting secondary curing, the performance of interfacial transition zone and pore structure in concrete can be improved, thereby improving the microstructural stability of concrete under steam or autoclaved curing. This paper reviews the influence of curing regime (standard curing, steam curing and autoclaved curing) on the composition and morphology of hydration products, interfacial transition zone structure and the pore structure in concrete material. Based on the review, effective measures to improve the interfacial transition zone and pore structure of concrete have been concluded and the mechanisms for these measures to improve the microstructural stability of concrete under different curing regime have been analyzed, which can provide references for the selection of curing regime for concrete. Finally, the deficiency in the microstructure formation and evolution of ultra-high performance concrete (UHPC) under different curing regimes have been summarized.
张高展, 葛竞成, 张春晓, 杨军, 刘开伟, 王爱国, 孙道胜. 养护制度对混凝土微结构形成机理的影响进展[J]. 材料导报, 2021, 35(15): 15125-15133.
ZHANG Gaozhan, GE Jingcheng, ZHANG Chunxiao, YANG Jun, LIU Kaiwei, WANG Aiguo, SUN Daosheng. Review on the Microstructure Formation Mechanism in Concrete MaterialUnder Different Curing Regimes. Materials Reports, 2021, 35(15): 15125-15133.
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