Affecting Mechanism of Curing Regimes on the Strength of Ultra-high Performance Concrete

被引：0
作者：
Sun, Jialun [1 ,2 ]
Zhang, Chunxiao [2 ]
Mao, Jize [3 ]
Li, Mingzhe [2 ,3 ]
Gao, Xiaojian [1 ]
机构：
[1] School of Civil Engineering, Harbin Institute of Technology, Harbin
[2] Research Institute for National Defense Engineering, Academy of Military Science PLA China, Henan, Luoyang
[3] College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin
来源：
Cailiao Daobao/Materials Reports | 2024年 / 38卷 / 18期
基金：
中国国家自然科学基金;
关键词：
curing regime; mechanical property; microstructure; ultra-high performance concrete;
D O I：
10.11896/cldb.23050059
中图分类号：
学科分类号：
摘要：
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. © 2024 Cailiao Daobaoshe/ Materials Review. All rights reserved.
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