低真空环境对硬化水泥浆体力学性能的影响

doi:10.11896/cldb.22070290

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Abstract To explore the mechanical properties of hardened cement paste under low vacuum, the mechanical properties of mature specimens (82 d and 128 d) exposed to low vacuum and indoor atmosphere were tested, the phase composition and pore structure were also investigated through X-ray diffraction (XRD) and Mercury intrusion porosimetry (MIP). The results show that short-term low vacuum exposure can improve the compressive strength of the mature specimens, but long-term low vacuum exposure is detrimental to the maintenance and development of specimen strength. Moreover, the low-vacuum environment basically does not change the phase type of hardened cement paste, and there is no obvious correlation between the C-S-H gel content and the strength. Besides, compared with the indoor atmospheric condition, the most probable pore size and total porosity of the mature specimens are obviously smaller after 28 days of low vacuum exposure, but larger after 168 days of low vacuum exposure, which has a good corresponding relationship with the strength development law.

Key words： cement paste low vacuum environment mechanical property phase composition pore structure

Published: 25 February 2024 Online: 2024-03-01

CLC number:

TU528

Fund:National Natural Science Foundation of China (52178226).

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	Articles by authors
	CHANG Honglei
	WANG Xiaolong
	GUO Zhengkun
	FENG Pan
	LI Shaowei
	LIU Jian

Cite this article:

CHANG Honglei,WANG Xiaolong,GUO Zhengkun, et al. Effect of Low Vacuum Environment on the Mechanical Properties of Hardened Cement Paste[J]. Materials Reports, 2024, 38(4): 22070290-6.

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http://www.mater-rep.com/EN/10.11896/cldb.22070290 OR http://www.mater-rep.com/EN/Y2024/V38/I4/22070290

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