摘要
秉承绿色发展理念,减少非自燃煤矸石(RCG)堆放造成的资源浪费及环境污染,将RCG部分取代天然粗骨料制备混凝土,系统评估了水胶比、粉煤灰取代率、RCG粗骨料取代率在不同侵蚀天数下对非自燃煤矸石粗骨料混凝土(RCGC)的耐硫酸盐侵蚀性能的影响,并借助扫描电镜-能谱分析(SEM-EDS)与压汞法(MIP)进一步揭示了损伤机理。研究结果表明:随着侵蚀天数的不断增加,RCGC试样的抗压强度损失率、质量损失率、超声波波速损失率均呈现出先减小后增大的趋势;RCG粗骨料取代率和水胶比越大,RCGC试样耐硫酸盐侵蚀性能越差;掺入15%粉煤灰可以提高RCGC试样的耐硫酸盐侵蚀性能;硫酸盐侵蚀后,RCG粗骨料取代率越大,混凝土试样内部的钙矾石和石膏等侵蚀产物越多,小于100nm的孔隙增加体积先增大后减小。
Adhering to the concept of green development and reducing the waste of resources and environmental pollution caused by the stacking of non⁃spontaneous combustion coal gangue(RCG),natural coarse aggregate was partially replaced with RCG to prepare concrete.The water⁃binder rate,fly ash substitution rate and RCG coarse aggregate substitution rate were systematically evaluated on the sulfate attack resistance performance of non⁃spontaneous combustion coal gangue coarse aggregate concrete(RCGC)at different attack ages,and the damage mechanism was further revealed by scanning electron microscopy⁃energy dispersive spectroscopy(SEM⁃EDS)and mercury intrusion porosimetry(MIP).The research results show that with the continuous increase of attack age,the compressive strength loss rate,mass loss rate and ultrasonic wave velocity loss rate of RCGC specimens all show a trend of first decreasing and then increasing.The higher RCG coarse aggregate substitution rate and water⁃binder rate,the worse the sulfate attack resistance performance of RCGC specimens.Addition of 15%fly ash can improve the sulfate attack resistance performance of RCGC specimens,and after sulfate attack,the higher the RCG coarse aggregate substitution rate,the more attack products such as ettringite and gypsum in concrete specimens,and the increase volume of pores smaller than 100nm firstly increases and then decreases.
作者
王志刚
安帅明
王海
高琦翔
牛晓燕
马宏强
WANG Zhigang;AN Shuaiming;WANG Hai;GAO Qixiang;NIU Xiaoyan;MA Hongqiang(Architecture and Civil Engineering Institute,Guangdong University of Petrochemical Technology,Maoming 525000,China;College of Civil Engineering and Architecture,Hebei University,Baoding 071002,China)
出处
《建筑结构》
北大核心
2025年第7期105-111,共7页
Building Structure
基金
河北省高等学校科学研究项目(QN2022067)。
关键词
非自燃煤矸石混凝土
抗压强度
硫酸盐侵蚀
损伤机理
non⁃spontaneous combustion coal gangue concrete
compressive strength
sulfate attack
damage mechanism
作者简介
第一作者:王志刚,硕士,高级实验师,主要从事土木工程材料方向的研究,Email:alexsea@gdupt.edu.cn;通信作者:牛晓燕,博士,教授,主要从事工程材料理论与应用方向的研究,Email:niu⁃xiaoyan2002@163.com。
