[1]陈 歆,刘 旭,董淑慧,等.高原低压低湿作用下水泥水化与孔结构发展[J].西安建筑科技大学学报(自然科学版),2021,(02):202-207.[doi:10.15986/j.1006-7930.2021.02.008]
 CHEN Xin,LIU Xu,DONG Shuhui,et al.Cement hydration and pore structure development in low air pressure and low humidity[J].J. Xi’an Univ. of Arch. & Tech.(Natural Science Edition),2021,(02):202-207.[doi:10.15986/j.1006-7930.2021.02.008]
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高原低压低湿作用下水泥水化与孔结构发展()
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西安建筑科技大学学报(自然科学版)[ISSN:1006-7930/CN:61-1295/TU]

卷:
期数:
2021年02期
页码:
202-207
栏目:
出版日期:
2021-04-28

文章信息/Info

Title:
Cement hydration and pore structure development in low air pressure and low humidity
文章编号:
1006-7930(2021)02-0202-06
作者:
陈 歆刘 旭董淑慧葛 勇
(哈尔滨工业大学 交通科学与工程学院,黑龙江 哈尔滨 150090)
Author(s):
CHEN Xin LIU Xu DONG Shuhui GE Yong
(School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, China)
关键词:
混凝土 水泥净浆 水化 孔结构 低气压
Keywords:
concrete cement paste hydration pore structure low air pressure
分类号:
TU528
DOI:
10.15986/j.1006-7930.2021.02.008
文献标志码:
A
摘要:
根据工程实践惯例与高原自然环境特点,模拟了低压低湿耦合作用下的典型养护模式,研究了各养护模式下水泥水化进程与水泥浆体内部孔结构发展特点.水泥水化的进程由硬化浆体中化学结合水的含量表征,通过高温灼烧测得.水泥净浆的孔结构发展通过压汞法和氮吸附法进行分析,得到的孔结构特点同时也是评价水泥水化进程的重要依据.最后以混凝土的抗压强度试验验证上述对水泥净浆在化学与物理层面的分析.结果表明:同样的相对湿度下,低压养护的水泥净浆化学结合水比常压养护的少,凝胶孔发展也不如常压养护的充分,即水化进程有一定程度的滞后.若过早停止保湿养护进入低压低湿环境,28 d时水泥净浆中将残留更多的毛细孔.试验各组混凝土均能达到设计强度等级,但当浸水养护只有7 d,养护气压低至61 kPa且相对湿度低至30%时,强度富余非常有限.
Abstract:
Typical curing modes considering low air pressure and low relative humidity were designed based on normal engineering practice and physico-geographical environment of plateau regions. Cement paste specimens were cured in these designed modes and subsequently experienced a series of tests to investigate the hydration level and pore structure development. The level of cement hydration was characterized by the content of chemically-combined water, which was tested by the loss on ignition. Pore structure development of hardened cement paste was analyzed by both mercury intrusion and nitrogen absorption. The pore structure provided extra basis for cement hydration evaluation. Finally, compressive strength test of concrete was conducted to verify the above chemical and physical analyses on hardened cement paste. Results show that in the same relative humidity, the hydration level of cement paste cured in low air pressure is lower than that in ordinary air pressure, presenting as lower content of chemically-combined water and less gel pores. More capillary pores would remain at 28 d age if moisture retention untimely discontinues to make the cement paste expose to an environment with low air pressure and low humidity. Moreover, although all tested concrete groups satisfy the anticipated strength grade, there is a very limited surplus for concrete cured in 61 kPa & RH 30% after only 7 d water immersion.

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(编辑 桂智刚)

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备注/Memo

备注/Memo:
收稿日期:2020-09-06 修改稿日期:2021-03-17
基金项目:国家国际科技合作专项项目(ISTCP 2014DFR81000)
第一作者:陈 歆(1991-),男,博士生,主要从事特殊环境作用下混凝土材料与结构性能研究.E-mail:xin.chen@alu.hit.edu.cn
通信作者:葛 勇(1962-),男,博士,教授,博士生导师,主要从事土木工程材料研究.E-mail:hitbm@163.com
更新日期/Last Update: 2021-04-28