[1]王家滨,牛荻涛.硝酸侵蚀喷射混凝土NO-3扩散研究[J].西安建筑科技大学学报(自然科学版),2019,(01):75-82.[doi:10.15986/j.1006-7930.2019.01.012]
 WANG Jiabin,NIU Ditao.Study on nitrate ion diffusion of lining shotcrete exposed to nitric acid[J].J. Xi’an Univ. of Arch. & Tech.(Natural Science Edition),2019,(01):75-82.[doi:10.15986/j.1006-7930.2019.01.012]
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硝酸侵蚀喷射混凝土NO-3扩散研究()
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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:
2019年01期
页码:
75-82
栏目:
出版日期:
2019-02-28

文章信息/Info

Title:
Study on nitrate ion diffusion of lining shotcrete exposed to nitric acid
文章编号:
1006-7930(2019)01-0075-08
作者:
王家滨1牛荻涛23
(1.西安工业大学 建筑工程学院,陕西 西安 710021;2.西安建筑科技大学 土木工程学院,陕西 西安 710055;3.省部共建西部绿色建筑国家重点实验室,陕西 西安 710055)
Author(s):
WANG Jiabin1 NIU Ditao23
(1.School of Civil & Architecture Engineering, Xian Tech. Univ., Xian, 710021; 2.School of Civil Engineering, Xian Univ. of Arch. & Tech., Xian, 710055; 3.National Key Laboratory of Green Building in West China, Xian, 710055)
关键词:
隧道工程 喷射混凝土 硝酸侵蚀 混凝土pH值 硝酸根离子扩散
Keywords:
tunnel engineering shotcrete nitric acid corrosion concrete pH value nitrate ion diffusion
分类号:
TU528
DOI:
10.15986/j.1006-7930.2019.01.012
文献标志码:
A
摘要:
以一般大气环境喷射混凝土衬砌长大公路隧道为背景,以汽车尾气中氮氧化物与水的主要产物硝酸为侵蚀介质,开展喷射混凝土硝酸浸泡试验,研究喷射混凝土衬砌结构耐久性能退化规律.采用固液萃取法和电化学分析法,测试侵蚀喷射混凝土pH值和NO-3含量,分析浸泡龄期、硝酸溶液pH值、钢纤维和混凝土成型方式等因素对喷射混凝土pH值和NO-3扩散的影响,研究硝酸侵蚀喷射混凝土物理力学性能劣化机理.结果表明,硝酸侵蚀喷射混凝土pH值高于模筑混凝土,而NO-3含量较低,喷射混凝土硝酸侵蚀耐久性优于模筑混凝土.侵蚀溶液pH值不大于2时,钢纤维喷射混凝土pH值和NO-3含量分别大于和小于普通喷射混凝土.综合分析钢纤维喷射混凝土物理力学性能、pH值及NO-3含量,钢纤维对提升低pH值硝酸侵蚀喷射混凝土耐久性能具有明显的作用
Abstract:
Durability degradation of shotcrete-lining-long-highway-tunnel in general atmospheric environment which is corroded nitrogen dioxide in automobile exhaust was analyzed. Shotcrete was immersed in nitric acid solution with pH of 1.0, 2.0 and 3.0. The pH values and nitrate ion diffusion of concrete specimens which were immersed in nitric acid solution were measured by using solid-liquid extraction method and electrochemical method. In the meantime, the influence factors of pH values and nitrate ion diffusion on shotcrete was discussed in terms of immersion aging, pH value of nitric acid solution, steel fiber and formation way, respectively. Result shows that the pH value of normal shotcrete was higher than that of normal concrete, while nitrate ion content was lower. Therefore, the durability of shotcrete exposed to nitric acid was better than that of normal concrete. As nitric acid solution pH value was less than 2, the pH value and nitrate ion content of steel fiber reinforced shotcrete were higher and lower than those of normal shotcrete, respectively. It was indicated that steel fiber can obviously improve the shotcrete durability exposed to low pH value nitric acid.

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备注/Memo

备注/Memo:
收稿日期:2017-12-27
修改稿日期:2019-01-15
基金项目:国家自然科学基金重大项目支课题(51590914);陕西省自然科学基金(2018JQ5032);陕西省教育厅自然科学研究专项(18JK0376);西安工业大学校长基金(XAGDXJJ17019)
第一作者:王家滨(1986-),男,博士,讲师,主要研究混凝土结构耐久性.E-mail: wangjiabin@xatu.edu.cn
更新日期/Last Update: 2019-03-05