新疆大石峡水利枢纽混凝土碱-硅酸反应抑制研究

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (2): 448-453.

所属专题：水泥混凝土

新疆大石峡水利枢纽混凝土碱-硅酸反应抑制研究

周晓青¹, 易阳¹, 汪峻峰¹, 鲁刘磊¹, 黎晓丽¹, 马良伟¹, 宋晓建², 兰小波³

1.深圳大学土木与交通工程学院,深圳 518060;
2.中国葛洲坝集团股份有限公司,武汉 430030;
3.中铁隧道局集团有限公司,佛山 528200

收稿日期:2022-07-10 修订日期:2022-11-10 出版日期:2023-02-15 发布日期:2023-03-07
通信作者: 鲁刘磊,博士,讲师。E-mail:luliulei@szu.edu.cn
作者简介:周晓青(1972—),女,副教授。主要从事混凝土结构抗爆抗冲击数值模拟的研究。E-mail:xqzhou@szu.edu.cn

Inhibition of Alkali-Silica Reaction of Concrete in Xinjiang Dashixia Water Control Project

ZHOU Xiaoqing¹, YI Yang¹, WANG Junfeng¹, LU Liulei¹, LI Xiaoli¹, MA Liangwei¹, SONG Xiaojian², LAN Xiaobo³

1. College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China;
2. China Gezhouba Group Co., Ltd, Wuhan 430030, China;
3. China Railway Tunnel Group Co., Ltd, Foshan 528200, China

Received:2022-07-10 Revised:2022-11-10 Online:2023-02-15 Published:2023-03-07

摘要/Abstract

摘要： 新疆大石峡水利枢纽混凝土选用的骨料存在碱活性,可能导致工程产生碱骨料破坏问题,本文研究了当地粉煤灰和矿粉对碱-硅酸反应(ASR)的影响,并采用XRD和SEM-EDS测试分析了水化产物和界面过渡区的形态。结果表明:粉煤灰掺量≥20%(质量分数)或矿粉掺量≥40%(质量分数)都能显著抑制碱-硅酸反应;在纯水泥样品界面过渡区可以观察到无定形相,在含有粉煤灰或矿粉的样品中未观察到无定形相,这意味着碱-硅酸反应发生在纯水泥样品中;添加粉煤灰或矿粉降低了界面过渡区物相的Ca/Si摩尔比,抑制了碱-硅酸反应。

关键词: 大坝混凝土, 粉煤灰, 矿粉, 碱-硅酸反应, 界面过渡区, 水化产物, 膨胀

Abstract: The aggregate selected for concrete in Xinjiang Dashixia water control project has alkaline activity, which may lead to the problem of alkali aggregate damage in project. The effects of local fly ash (FA) and ground granulated blast furnace slag (GGBFS) on alkali-silica reaction (ASR) were investigated. In addition, XRD and SEM-EDS were used to analyze hydration products and morphology of interface transition zone (ITZ). FA content ≥20% (mass fraction) or GGBFS content ≥40% (mass fraction) can significantly inhibit alkali-silica reaction. Amorphous phase is observed in interfacial transition zone of pure cement samples, and no amorphous phase is observed in samples containing FA or GGBFS, which means that the alkali-silica reaction occurs in pure cement samples. The addition of FA or GGBFS reduces the Ca/Si molar ratio of interfacial transition zone phase and inhibits alkali-silica reaction.

Key words: dam concrete, fly ash, ground granulated blast furnace slag, alkali-silica reaction, interface transition zone, hydration product, expansion

中图分类号:

TU528.36

周晓青, 易阳, 汪峻峰, 鲁刘磊, 黎晓丽, 马良伟, 宋晓建, 兰小波. 新疆大石峡水利枢纽混凝土碱-硅酸反应抑制研究[J]. 硅酸盐通报, 2023, 42(2): 448-453.

ZHOU Xiaoqing, YI Yang, WANG Junfeng, LU Liulei, LI Xiaoli, MA Liangwei, SONG Xiaojian, LAN Xiaobo. Inhibition of Alkali-Silica Reaction of Concrete in Xinjiang Dashixia Water Control Project[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(2): 448-453.

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新疆大石峡水利枢纽混凝土碱-硅酸反应抑制研究

Inhibition of Alkali-Silica Reaction of Concrete in Xinjiang Dashixia Water Control Project

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