碳纤维增强聚合物水泥注浆材料力学性能及其微观机理

针对松散破碎巷道控制问题,普通水泥注浆存在诸多缺陷,且水泥颗粒不能注入半径小于0.2 mm的孔隙或者裂隙中。本文采用碳纤维、聚合物以及超细水泥制备试块,通过单轴压缩试验及巴西劈裂试验确定注浆材料的最佳配合比。试验结果表明,当碳纤维掺量为水泥掺量的1.0%(质量分数)时,水泥砂浆试块性能最佳。采用电子扫描显微镜(SEM)确定试块微观结构,结合聚合物成膜的Ohama模型和Konietzko模型,分析其微观结构形成过程及碳纤维失效模式,揭示碳纤维增强聚合物水泥注浆材料微观增强机理。本文为降低深部破碎煤岩巷道维护成本,实现深部开采可持续发展提供了技术支撑。

Mechanical Properties and Micro Mechanism of Carbon Fiber Reinforced Polymer Cement Grouting Material

According to the control problem of loose and fractured roadway,there are many defects about ordinary cement grouting,and cement particles can not be injected into pores or fractures with a radius of less than 0.2 mm.The samples were made by mixture of carbon fiber,polymer and superfine cement,and the best proportion of grouting material was determined by uniaxial compression test and Brazilian splitting test.The test results show that the performance of cement mortar test block is the best when the content of carbon fiber is 1.0%(mass fraction)of cement content.The microstructure composition of the sample fragment was determined by electron microscope scanning(SEM).Combined with the Ohama model and Konietzko model of polymer film formation,the microstructure formation process and carbon fiber failure mode were analyzed,and the microscopic reinforcement mechanism of carbon fiber reinforced polymer cement grouting material was studied.This research provides technical support for reducing the maintenance cost of deep loose and fractured roadway and realizing the sustainable development of deep mining.