摘要
文章探究玻璃掺量及粒径对可控性低强度材料(controlled low strength materials,CLSM)的工作性能、力学性能及耐久性能的影响。根据流动度确定水胶比,开展经时流动度、泌水率、无侧限抗压强度(unconfined compressive strength,UCS)及冻融耐久性试验;采用X射线衍射(X-ray diffraction,XRD)和扫描电子显微镜(scanning electron microscope,SEM)分析CLSM的微观结构及强度机理。研究结果表明:玻璃掺量过多会导致保水性下降、增大离析泌水;所有配比28 d抗压强度均大于0.5 MPa,90 d最大增至5.2 MPa;玻璃掺量过多(玻璃与黏结剂质量比为2.0和2.5)且粒径为3~5 mm的CLSM耐久性较差。随养护时间增加,C-S-H特征峰值增加,并出现托贝莫来石晶体特征峰,CLSM强度提高。玻璃与黏结剂质量比为1.0的CLSM各性能可达到最理想效果;综合破碎工序,粒径3~5 mm、质量比1.0为最佳参数。
The effects of glass content and particle size on the working performance,mechanical properties and durability of controlled low strength materials(CLSM)were investigated.The water-to-binder ratio was determined according to the fluidity,and the time-depended fluidity loss,bleeding rate,unconfined compressive strength(UCS)and freeze-thaw durability tests were carried out.The microstructure and strength mechanism of CLSM were analyzed by X-ray diffraction(XRD)and scanning electron microscope(SEM).The results showed that excessive glass content would lead to decreased water retention and increased segregation bleeding.The 28 d compressive strength of all ratios was greater than 0.5 MPa,and the maximum compressive strength increased to 5.2 MPa at 90 d.The durability of CLSM with excessive glass content(glass-to-binder ratio of 2.0 and 2.5)and particle size of 3-5 mm was poor.With the increase of curing time,the peak value of C-S-H increased,and the characteristic peak of Tobermorite crystal appeared,and the strength of CLSM increased.The optimal CLSM performance can be achieved with a glass-to-binder ratio of 1.0.The particle size of 3-5 mm and the glass-to-binder ratio of 1.0 are the optimal parameters in terms of glass breaking process.
作者
储诚富
刘云
董满生
CHU Chengfu;LIU Yun;DONG Mansheng(School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009,China;School of Automobile and Traffic Engineering,Hefei University of Technology,Hefei 230009,China)
出处
《合肥工业大学学报(自然科学版)》
北大核心
2025年第6期770-775,共6页
Journal of Hefei University of Technology:Natural Science
基金
国家自然科学基金资助项目(42172307)
安徽省自然科学基金资助项目(2008085MD118)。
