摘要
掺加塑性膨胀剂是改善矿用注浆材料体积稳定性的有效措施。采用塑性膨胀剂制备矿用注浆材料,探究了塑性膨胀剂对其工作性能、流变性能、力学性能以及体积稳定性等关键参数的影响规律,并通过孔结构和微观形貌分析阐明其作用机理。结果表明:随着塑性膨胀剂掺量的增加,注浆材料的工作性能和流变性能均有所改善,抗压及抗折强度不断降低,3 h竖向膨胀率逐渐增加,但对中后期体积变形影响较小。掺入塑性膨胀剂后,硬化浆体总孔隙率及平均孔径均显著增长,掺量高于0.12%时,毛细孔和大孔比例增长幅度更大。综合考虑注浆材料性能参数要求,塑性膨胀率掺量范围为0.04%~0.08%时较为适宜。
Adding plastic expansion agent is an effective measure to improve the volume stability of mine grouting materials.By preparing mine grouting materials with plastic expansion agent,the influence of plastic expansion agent on its working performance,rheological properties,mechanical properties and volume stability was investigated.Then,the mechanism was elucidated through the analysis of pore structure and microscopic morphology.The results show that with the increase of plastic expansion agent content,the working performance and rheological property of the grouting materials are improved,the compressive strength and flexural strength decrease,the plastic expansion rate increases gradually at 3 h,but the influence on volume deformation is small in the middle and late stages.The total porosity and average pore size of the hardened slurry are increased significantly after the addition of plastic expansion agent.When the addition rate is higher than 0.12%,the proportion of capillary pores and large pores are increased more.Considering the performance parameter requirements of grouting materials,it is more suitable when the plastic expansion rate is in the range of 0.04%-0.08%.
作者
孙启栋
王明
许海燕
张进
鲁莎
黄冰
SUN Qidong;WANG Ming;XU Haiyan;ZHANG Jin;LU Sha;HUANG Bing(Shandong Zhongxing Jian'an Construction Engineering Co.,Ltd.,Zaozhuang,Shandong 277099,China;School of Electrical Engineering,University of Jinan,Jinan,Shandong 250022,China)
出处
《矿业研究与开发》
北大核心
2025年第12期135-143,共9页
Mining Research and Development
基金
国家重点研发计划项目(2022YFE0208200)。
关键词
塑性膨胀剂
注浆材料
流变性能
力学性能
体积稳定性
Plastic expansion agent
Grouting material
Rheological property
Mechanical property
Volume stability
