活化煤矸石粉对煤矸石粗骨料混凝土性能的影响

兰州理工大学学报 ›› 2024, Vol. 50 ›› Issue (1): 139-145.

活化煤矸石粉对煤矸石粗骨料混凝土性能的影响

阎杰^1,2, 单豆豆¹, 王啸天¹, 于旭涛¹, 刘兴隆¹, 谢军^*1

1.河北建筑工程学院土木工程学院, 河北张家口 075000;
2.河北省高校绿色建材与建筑改造应用技术研发中心, 河北张家口 075000

收稿日期:2022-03-10 出版日期:2024-02-28 发布日期:2024-03-04
通讯作者: 谢军(1979-),男,辽宁营口人,博士,副教授. Email:xiejun79@hebiace.edu.cn
基金资助:
2023年张家口市重点研发计划项目(2322145D),2024年度河北省高等学校科学研究项目(ZC2024136)

Influence of activated coal gangue powder on performance of coal gangue coarse aggregate concrete

YAN Jie^1,2, SHAN Dou-dou¹, WANG Xiao-tian¹, YU Xu-tao¹, LIU Xing-long¹, XIE Jun¹

1. School of Civil Engineering, Hebei University of Architecture, Zhangjiakou 075000, China;
2. Hebei University Green Building Materials and Building Transformation Application Technology Research and Development Center, Zhangjiakou 075000, China

Received:2022-03-10 Online:2024-02-28 Published:2024-03-04

摘要/Abstract

摘要： 采用热活化方式制备活化煤矸石粉(CGP),将其作为矿物掺合料与煤矸石粗骨料(CGA)复掺形成煤矸石粗骨料混凝土.利用压汞法、氮吸附法及扫描电镜研究CGP掺量对不同煤矸石粗骨料取代率混凝土孔结构和微观形貌的影响.结果表明:煤矸石粗骨料混凝土的抗压强度受不同CGP掺量和CGA取代率的影响,当CGP取代率为15%、CGA取代率为100%时,全煤矸石粗骨料混凝土的抗压强度较基准组提升最大;CGP的掺入降低了煤矸石粗骨料混凝土的氯离子扩散系数,提高了试件的抗氯离子渗透性能;适配掺量下的CGP可以降低水化体系中碱离子的浓度,促进水泥熟料的水化反应,进而优化全煤矸石粗骨料混凝土内部孔隙结构.

关键词: 煤矸石, 活化, 抗压强度, 氯离子迁移系数, 孔结构

Abstract: Activated coal gangue powder (CGP) was prepared by thermal activation method, which was mixed with coal gangue coarse aggregate (CGA) as mineral admixture to form coal gangue coarse aggregate concrete. The effects of CGP content on the pore structure and microstructure of concrete with different gangue coarse aggregate replacement rates were studied by mercury injection, nitrogen adsorption and scanning electron microscopy. The results show that the compressive strength of coal gangue coarse aggregate concrete is affected by different CGP content and CGA replacement rate. When CGP replacement rate is 15% and CGA replacement rate is 100%, the compressive strength of all coal gangue coarse aggregate concrete increases the most compared with the reference group. The addition of CGP reduces the chloride ion diffusion coefficient of coal gangue coarse aggregate concrete and improves the chloride ion permeability resistance of specimens. CGP can reduce the concentration of alkali ion in the hydration system, promote the hydration reaction of cement clinker, and increase the harmless holes, and optimize the internal pore structure of coarse aggregate concrete with coal gangue.

Key words: coal gangue, activation, compressive strength, chloride ion migration coefficient, pore structure

中图分类号:

TU528

阎杰, 单豆豆, 王啸天, 于旭涛, 刘兴隆, 谢军. 活化煤矸石粉对煤矸石粗骨料混凝土性能的影响[J]. 兰州理工大学学报, 2024, 50(1): 139-145.

YAN Jie, SHAN Dou-dou, WANG Xiao-tian, YU Xu-tao, LIU Xing-long, XIE Jun. Influence of activated coal gangue powder on performance of coal gangue coarse aggregate concrete[J]. Journal of Lanzhou University of Technology, 2024, 50(1): 139-145.

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