碳化硅晶须对超高性能混凝土力学性能的影响

doi:10.11896/cldb.24050200

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Abstract Influence of silicon carbide whiskers (SiCw) on mechanical properties of ultra-high performance concrete (UHPC) was investigated. Moreover, microstructure of UHPC modified by SiCw was determined by means of scanning electron microscopy, mercury intrusion porosimetry and X-ray diffraction analysis. The results showed that SiCw is not conducive to improving the mechanical properties of matrix at the early age (within 8 h), but has a positive effect on the mechanical properties in the later stage. This is mainly due to that the SiO₂ protective film on the whiskers adsorbed Ca²⁺ in the solution at the early age, which can delay the hydration of cement to a certain extent. With the extension of curing age, the nucleation effect, filling effect and bridging effect of whiskers are effectively exerted. Meanwhile, the SiO₂ protective film on the surface of SiCw may also react with calcium hydroxide crystals generated by the cement hydration, thus resulting in the formation of more additional C-(A)-S-H gels. In addition, larger aspect ratio increases the contact area between SiCw and the UHPC matrix to get stronger interface adhesion between them, resulting in more energy consumption during the pulling out process, which is more conducive to improving the mechanical properties of UHPC. However, excessive SiCw is difficult to uniformly disperse, and they easily aggregate in the matrix and form defects, which will adversely affect the mechanical properties of UHPC. The optimum dosage is 0.15% in this experiment.

Key words： ultra-high performance concrete silicon carbide whisker aspect ratio mechanical property microstructure

Published: 10 August 2025 Online: 2025-08-13

CLC number:

TU528

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	Articles by authors
	NIU Xujing
	GUO Chenyi
	WU Jiayi
	ZHANG Jiahao
	PENG Gaifei
	DING Hong

Cite this article:

NIU Xujing,GUO Chenyi,WU Jiayi, et al. Influence of Silicon Carbide Whiskers (SiCw) on Mechanical Properties of Ultra-high Performance Concrete[J]. Materials Reports, 2025, 39(15): 24050200-8.

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https://www.mater-rep.com/EN/10.11896/cldb.24050200 OR https://www.mater-rep.com/EN/Y2025/V39/I15/24050200

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