养护制度对超高性能混凝土强度的影响机理

doi:10.11896/cldb.23050059

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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.

Key words： ultra-high performance concrete curing regime mechanical property microstructure

Published: Online: 2024-10-12

CLC number:

TU528.31

Fund:This work was financially supported by the National Natural Science Foundation of China (U2106220) and the Natural Science Foundation of Heilongjiang Province (ZD2021E007).

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	Articles by authors
	SUN Jialun
	ZHANG Chunxiao
	MAO Jize
	LI Mingzhe
	GAO Xiaojian

Cite this article:

SUN Jialun,ZHANG Chunxiao,MAO Jize, et al. Affecting Mechanism of Curing Regimes on the Strength of Ultra-high Performance Concrete[J]. Materials Reports, 2024, 38(18): 23050059-5.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.23050059 OR http://www.mater-rep.com/EN/Y2024/V38/I18/23050059

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