摘要
为了深入解析矿用硅酸盐改性聚氨酯注浆加固材料的微观结构,并了解微观结构对宏观强度的影响规律;推断了该体系涉及的主要反应及反应过程;利用扫描电子显微镜(SEM)表征了复合体系的微观相分布,利用能谱分析仪(EDS)并采用面扫法定性地表征了元素富集状态,同时采用点扫法定量表征了各相所含主要元素及原子百分比;研究了微观结构对宏观强度的影响规律。结果表明:硅酸盐改性聚氨酯固结体呈现三相分布,分别是高分子连续相、硅酸聚合物(或二氧化硅)微球相和碳酸钠针晶相;微观结构上无序的相分布易造成应力集中,宏观上表现为材料力学强度下降。
In order to deeply analyze the microstructure of silicate modified polyurethane grouting reinforcement materials for mining and understand the influence of microstructure on the macro strength,firstly,the main reactions and reaction processes involved in this system are deduced.Secondly,the phase distribution of the composite system is characterized by scanning electron microscopy(SEM).The enrichment state of elements is qualitatively characterized by surface scan method and the percentage of main elements and atoms in each phase is quantitatively characterized by point scan method.Finally,the influence of microstructure on the macro strength is studied.As a result,there are three phases in silicate modified polyurethane grouting reinforcement materials,which are polymer continuous phase,silica polymer microsphere phase and sodium carbonate acicular phase.The disordered distribution of phases in microstructure is easy to cause stress concentration,which is manifested in the decrease of mechanical strength of materials.
作者
王玉超
于潇沣
柏广峰
孙刚
WANG Yuchao;YU Xiaofeng;BAI Guangfeng;SUN Gang(Mine Oil Products Branch,China Coal Science and Technology Research Institute,Beijing 100013,China;State Key Laboratory of High Efficient Mining and Clean Utilization of Coal Resources,Beijing 100013,China;National Energy Technology and Equipment Laboratory of Coal Utilization and Emission Control,Beijing 100013,China)
出处
《煤矿安全》
CAS
北大核心
2021年第5期233-237,共5页
Safety in Coal Mines
基金
中国煤炭科工集团青年基金资助项目(2019-TD-QN022)。
关键词
硅酸盐改性
聚氨酯
注浆加固
微观结构
围岩加固材料
silicate modification
polyurethane
grouting reinforcement
microstructure
surrounding rock reinforcement material
