Affecting Mechanism of Curing Regimes on the Strength of Ultra-high Performance Concrete
SUN Jialun1,2, ZHANG Chunxiao2, MAO Jize3, LI Mingzhe2,3, GAO Xiaojian1,*
1 School of Civil Engineering, Harbin Institute of Technology, Harbin 150001, China 2 Research Institute for National Defense Engineering of Academy of Military Science PLA China, Luoyang 471023, Henan, China 3 College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001, China
Abstract: Ultra-high performance concrete (UHPC) has excellent mechanical properties and durability, and is widely used in various engineering, among which curing is an important condition to ensure its high performance. From the perspective of curing regime, through the method of microstructure characterization, the effects of different curing regimes (standard curing, steam curing, dry heat curing and combined curing) on the microstructure of UHPC were studied, and then the mechanism of improving the strength of UHPC was explained. The research shows that different curing regimes have a great influence on the microstructure of ultra-high performance concrete; compared with standard curing, the three thermal curing significantly improved the morphological characteristics and spatial distribution of C-S-H gel, among which the improvement effect of combined curing. In addition, the change of curing conditions also significantly affects the bonding properties of internal fibers and the matrix stability of the interfacial transition zone. This is because the high temperature and high humidity environment promote the secondary hydration of cement, generate a large amount of C-S-H gel, and consumes calcium hydroxide (CH), making its microstructure more dense. This indicates that necessary temperature and humidity environment can effectively improve the microstructure of UHPC, which is also an important reason for the strength improvement of UHPC.
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2024, Vol. 38 
