硫酸盐对超深井井壁混凝土力学性能的影响及劣化机理

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (9): 2939-2947.

硫酸盐对超深井井壁混凝土力学性能的影响及劣化机理

赵晓红¹, 沈玉², 刘娟红^1,3,4, 郭子栋¹

1.北京科技大学土木与资源工程学院,北京 100083;
2.中交二公局第三工程有限公司,西安 710018;
3.北京科技大学城市地下空间工程实验室,北京 100083;
4.北京科技大学金属矿山高效开采与安全教育部重点实验室,北京 100083

收稿日期:2021-03-30 修回日期:2021-04-26 出版日期:2021-09-15 发布日期:2021-10-08
通讯作者: 刘娟红,博士,教授。E-mail:juanhong1966@hotmail.com
作者简介:赵晓红(1996—),女,硕士研究生。主要从事绿色高性能混凝土及新型建筑材料的研究。E-mail:18701182586@163.com
基金资助:
国家重点研发计划(2016YFC0600803);中央高校基本科研业务费(FRF-BD-20-01A,FRF-BD-20-01B)

Influence of Sulfate on Mechanical Properties of Shaft Wall Concrete in Ultra-Deep Wells and Its Degradation Mechanism

ZHAO Xiaohong¹, SHEN Yu², LIU Juanhong^1,3,4, GUO Zidong¹

1. School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. CCCC-SHEC Third Engineering Co., Ltd., Xi'an 710018, China;
3. Beijing Key Laboratory of Urban Underground Space Engineering, University of Science and Technology Beijing, Beijing 100083, China;
4. Key Laboratory of the Ministry of Metal Mining and Safety Education, University of Science and Technology Beijing, Beijing 100083, China

Received:2021-03-30 Revised:2021-04-26 Online:2021-09-15 Published:2021-10-08

摘要/Abstract

摘要： 针对深部地下工程中混凝土材料面临的高地温、高地应力、高渗透压、强腐蚀的恶劣服役条件,选取C70仿钢纤维混凝土(C70-ISFRC)和高性能超深井井壁混凝土(HUC)作为研究对象,研究两种混凝土在硫酸盐干湿循环条件下力学性能、破坏形态及冲击倾向性等变化,并采用扫描电镜及能谱分析其劣化机理。结果表明:随着硫酸盐干湿循环的进行,两种混凝土力学性能均表现为先增强后减弱的趋势,但HUC的性能更为优异,且劈裂抗拉强度较抗压强度对硫酸盐干湿循环机制更加敏感;两种混凝土的韧性均变差,但HUC中的镀铜钢纤维的抗拉性能优于聚丙烯仿钢纤维,使HUC板“坏而不断”;两种混凝土的冲击倾向性均增强,但HUC的冲击倾向性弱于C70-ISFRC;在硫酸盐干湿循环中,HUC与C70-ISFRC的腐蚀类型分别以石膏类腐蚀与钙矾石类腐蚀为主,表明混凝土内部存在膨胀应力,导致了混凝土内部结构的开裂。

关键词: 高性能超深井井壁混凝土, C70仿钢纤维混凝土, 硫酸盐环境, 冲击倾向性, 四点弯曲, 结晶破坏

Abstract: In view of the severe service conditions of high temperature, high stress, high permeability and strong corrosion faced by concrete materials in deep underground engineering, this paper selects C70 imitation steel fiber reinforced concrete (C70-ISFRC) and high performance ultra-deep well wall concrete (HUC) as research objects to study the mechanical properties, failure forms and bursting liability of the two kinds of concrete under sulfate dry-wet cycle conditions. The degradation mechanism of C70-ISFRC and HUC were analyzed by SEM and EDS. The results show that with the progresses of sulfate dry-wet cycle, the mechanical properties of the two kinds of concrete increase first and then decrease, but the performance of HUC is more excellent than C70-ISFRC. In addition, the splitting tensile strength is more sensitive than the compressive strength under the condition of sulfate dry-wet cycle. The toughness of the two kinds of concrete become worse, but the copper plated steel fibers in HUC have better tensile properties than polypropylene imitation steel fibers, which make the HUC board “broken but complete”. In addition, the bursting liability of both kinds of concrete become stronger, but the bursting liability of HUC is weaker than C70-ISFRC. Under the condition of sulfate dry-wet cycle, the corrosion type of HUC is gypsum corrosion and the corrosion type of C70-ISFRC is AFt corrosion, which indicates that the expansion stress in concrete leads to the cracking of internal structure of concrete.

Key words: high performance ultra-deep well wall concrete, C70 imitation steel fiber reinforced concrete, sulfate environment, impact tendency, four point bending, crystallization damage

中图分类号:

TU528

赵晓红, 沈玉, 刘娟红, 郭子栋. 硫酸盐对超深井井壁混凝土力学性能的影响及劣化机理[J]. 硅酸盐通报, 2021, 40(9): 2939-2947.

ZHAO Xiaohong, SHEN Yu, LIU Juanhong, GUO Zidong. Influence of Sulfate on Mechanical Properties of Shaft Wall Concrete in Ultra-Deep Wells and Its Degradation Mechanism[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(9): 2939-2947.

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