硫酸盐干湿循环作用下煤矸石喷射混凝土劣化机理

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (10): 3686-3693.

硫酸盐干湿循环作用下煤矸石喷射混凝土劣化机理

刘超^1,2, 蔡建赟¹, 朱超², 姚羿舟²

1.西安建筑科技大学理学院,西安 710055;
2.西安建筑科技大学土木学院,西安 710055

收稿日期:2024-03-21 修订日期:2024-04-16 出版日期:2024-10-15 发布日期:2024-10-16
作者简介:刘超(1982—),男,博士,教授。主要从事3D打印智能建造、大宗固废资源化利用、低碳环保型混凝土、再生建筑材料及其结构性能领域的研究。E-mail:chaoliu@xauat.edu.cn
基金资助:
国家自然科学基金(52178251,62276207);陕西省秦创原“科学家+工程师”队伍建设项目(2023KXJ-242);陕西省教育厅科学研究计划项目(23JY041);陕西省教育厅产业化项目(23JC047);陕西省科技厅重点研发计划-技术创新引导专项(2023GXLH-049);西安市级增材制造核心技术攻关项目(23ZDCYJSGG029-2022);陕西高校青年创新团队(2023-2026)

Deterioration Mechanism of Coal Gangue Shotcrete under Dry-Wet Cycles of Sulfate

LIU Chao^1,2, CAI Jianyun¹, ZHU Chao², YAO Yizhou²

1. School of Science, Xi'an University of Architecture and Technology, Xi'an 710055, China;
2. School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China

Received:2024-03-21 Revised:2024-04-16 Published:2024-10-15 Online:2024-10-16

摘要/Abstract

摘要： 为促进高硫酸盐环境下煤矿地区煤矸石大规模利用,本文制备了不同煤矸石取代率的喷射混凝土,研究干湿循环作用下煤矸石对喷射混凝土抗硫酸盐侵蚀的影响规律,从表观形貌、质量损失率、相对动弹性模量、相对抗压强度、硫酸根离子分布演化和侵蚀前后微观形貌变化进行了研究,得到了煤矸石对喷射混凝土抗硫酸盐侵蚀的影响机理。结果表明,在硫酸盐干湿循环作用下,煤矸石喷射混凝土(CGS)的劣化过程分为强化阶段、初始损伤和宏观破坏三个阶段。CGS劣化程度受干湿循环次数和煤矸石取代率协同影响,25%(质量分数)取代率下CGS抗硫酸盐性能提升,当取代率超过25%后,CGS抗硫酸盐侵蚀能力随着取代率的增加而降低。研究成果可为CGS结构在矿下应用提供重要的理论支撑。

关键词: 硫酸盐侵蚀, 煤矸石, 喷射混凝土, 干湿循环, 劣化规律, 损伤机理

Abstract: In order to promote the large-scale utilization of coal gangue in coal mine areas under high sulfate environment, this article prepared shotcrete with different coal gangue substitution rates, and studied the influence law of coal gangue on the sulfate attack resistance of shotcrete under the action of dry-wet cycles. The appearance, mass loss rate, relative dynamic elastic modulus, relative compressive strength, sulfate ion distribution evolution and micromorphology changes before and after erosion were studied, and the influence mechanism of coal gangue on the sulfate attack resistance of shotcrete was obtained. The results show that under the action of sulfate dry-wet cycles, the deterioration process of coal gangue shotcrete (CGS) is divided into three stages: strengthening stage, initial damage and macroscopic damage. The deterioration degree of CGS is synergistically affected by the number of dry-wet cycles and the substitution rate of coal gangue. The sulfate resistance of CGS increases at a substitution rate of 25% (mass fraction). When the substitution rate exceeds 25%, the sulfate attack resistance of CGS decreases with the increase of substitution rate. The research results provide important theoretical support for the application of CGS structures in mines.

Key words: sulfate attack, coal gangue, shotcrete, dry-wet cycle, deterioration law, damage mechanism

中图分类号:

TU528.01

刘超, 蔡建赟, 朱超, 姚羿舟. 硫酸盐干湿循环作用下煤矸石喷射混凝土劣化机理[J]. 硅酸盐通报, 2024, 43(10): 3686-3693.

LIU Chao, CAI Jianyun, ZHU Chao, YAO Yizhou. Deterioration Mechanism of Coal Gangue Shotcrete under Dry-Wet Cycles of Sulfate[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(10): 3686-3693.

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