水浸泡和潮湿环境下CO2侵蚀对水泥基材料孔结构的影响

doi:10.16085/j.issn.1000-6613.2018-0086

化工进展 ›› 2018, Vol. 37 ›› Issue (12): 4791-4798.DOI: 10.16085/j.issn.1000-6613.2018-0086

水浸泡和潮湿环境下CO₂侵蚀对水泥基材料孔结构的影响

周辉^1,2, 郑俊^1,2, 胡大伟^1,2, 张传庆^1,2, 卢景景^1,2, 高阳^1,2

1 中国科学院武汉岩土力学研究所岩土力学与工程国家重点试验室, 湖北武汉 430071;
2 中国科学院大学, 北京 100049

收稿日期:2018-01-10 修回日期:2018-04-02 出版日期:2018-12-05 发布日期:2018-12-05
通讯作者: 郑俊,讲师,博士研究生,研究方向为隧洞支护以及混凝土耐久性。
作者简介:周辉(1972-),男,研究员,博士生导师,研究方向为岩石力学试验、理论、数值分析与工程安全性分析。E-mail:hzhou@whrsm.ac.cn。
基金资助:
国家自然科学基金（51479193，51779252，51404240）及中国科学院"百人计划"项目。

Effect of CO₂ erosion on the pore structure of cement-based materials in water soaking and moist environment

ZHOU Hui^1,2, ZHENG Jun^1,2, HU Dawei^1,2, ZHANG Chuanqing^1,2, LU Jingjing^1,2, GAO Yang^1,2

1 State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, Hubei, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China

Received:2018-01-10 Revised:2018-04-02 Online:2018-12-05 Published:2018-12-05

摘要/Abstract

摘要： 引水隧洞等地下工程结构处于复杂的水环境。引水隧洞运行和检修期，混凝土结构分别处于水浸泡和潮湿环境，其服役环境下CO₂对混凝土结构的侵蚀作用与大气环境下的碳化作用存在一定差异。本文采用氮吸附法分析水浸泡和潮湿环境下CO₂侵蚀后水泥基材料的孔结构，并与大气环境下侵蚀后的孔结构作对比。研究结果表明：CO₂侵蚀作用下，水泥基材料吸附能力提高，而水浸泡和潮湿环境下水泥基材料碳化后吸附能力较大气环境下要大；CO₂侵蚀后，水泥基材料小孔隙数量明显增多而大孔隙数量减少，而水浸泡和潮湿环境下水泥基材料小孔隙数量较大气环境下要多，其中水浸泡环境下水泥基材料总孔体积、平均孔径以及所有孔径的孔隙数量均大于潮湿环境，水浸泡环境会进一步加剧孔隙的发育和扩展。

关键词: 吸附, 脱附, 二氧化碳, 引水隧洞, 侵蚀, 孔结构, 碳化

Abstract: The underground engineering structures, such as diversion tunnel, are in a complex water environment. The concrete structure of a diversion tunnel is in water soaking and moist environment respectively during its operation and maintenance period. Within the service period, the erosion effect of CO₂ on the concrete structure is different from that by the carbonation under the atmospheric environment. The pore structure of the cement-based materials after CO₂ erosion in a water immersed and humid environment was analyzed by nitrogen adsorption method and compared with that after erosion in an atmospheric environment. The results showed that the adsorption capacity of the cement-based materials was always improved under the erosion of CO₂, but the adsorption capacity in the water soaking and moist environment was greater than that in the atmospheric environment. After the CO₂ erosion, the number of small pores in the cement-based materials increased significantly while that of large pores decreased. In the water soaking and moist environment, the number of small pores was more than that in the atmospheric environment. The total pore volume, average pore size and the number of pores of all sizes in the water soaking environment were all greater than those in the moist environment, and the water soaking environment would further aggravate the development and expansion of the pores.

Key words: adsorption, desorption, carbon dioxide, diversion tunnel, erosion, pore structure, carbonation

中图分类号:

周辉, 郑俊, 胡大伟, 张传庆, 卢景景, 高阳. 水浸泡和潮湿环境下CO₂侵蚀对水泥基材料孔结构的影响[J]. 化工进展, 2018, 37(12): 4791-4798.

ZHOU Hui, ZHENG Jun, HU Dawei, ZHANG Chuanqing, LU Jingjing, GAO Yang. Effect of CO₂ erosion on the pore structure of cement-based materials in water soaking and moist environment[J]. Chemical Industry and Engineering Progress, 2018, 37(12): 4791-4798.

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水浸泡和潮湿环境下CO₂侵蚀对水泥基材料孔结构的影响

Effect of CO₂ erosion on the pore structure of cement-based materials in water soaking and moist environment

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