Effect of Low Atmospheric Pressure Environment on Properties and Hydration Process of Cement-Based Materials

被引：0

作者：

Bao, Weixing ^{[1
]}

Sun, Xun ^{[1
,2
,3
]}

Chen, Rui ^{[1
]}

机构：

[1] School of Highway, Chang’an University, Xi’an

[2] CCCC Second Highway Engineering Co., Ltd., Xi’an

[3] Research and Development Center on Construction Technology of Long Bridge and Tunnel in Mountain Areas, CCCC, Xi’an

来源：

Jianzhu Cailiao Xuebao/Journal of Building Materials | 2024年 / 27卷 / 09期

关键词：

capillary water absorption property; cement hydration; low atmospheric pressure; pore structure; relative water absorption;

D O I：

10.3969/j.issn.1007-9629.2024.09.001

中图分类号：

学科分类号：

摘要：

The effects of low atmospheric pressure on the properties and hydration process of cement‑based materials were studied by strength tests, X‑ray scanning and comprehensive thermal analysis. The results show that the low curing atmospheric pressure delays the cement hydration process, the generation of hydration products decreases, and the lower the curing atmospheric pressure, the more significant the impact effect. An obvious hydration plateau period appeares at the age of 3-7 days. Under the low curing atmospheric pressure, the pore structure of the cement‑based marerials deteriorates, and the proportions of gel pore growth is the largest. The lower the curing atmospheric pressure, the higher the water absorption rate, and the greater water absorption amount. However, the water absorption, water absorption rate and relative water absorption rate of the cement‑based marerials all decrease significantly with the decrease of environmental atmospheric pressure. © 2024 Tongji University. All rights reserved.

引用

页码：773 / 779and788

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