泡沫混凝土物理力学特性研究

Study on physical and mechanical properties of foam concrete

泡沫混凝土在井下充填密闭领域具有广阔的应用前景,选取适当性能的材料是井下填充时必不可少的考虑因素。本文通过吸水率实验发现泡沫混凝土吸水率随着材料密度的增加而降低。在单轴和三轴压缩试验中,泡沫混凝土强度随材料密度的增加呈现上升趋势。对泡沫混凝土进行直剪试验发现不同密度的混凝土试件破坏形态差别较大,大致可以归结为3种类型。SHPB冲击试验表明围压的增加可以极大地提高试件的抗压强度及变形性能。以上试验结果可为井下巷道充填密闭效果提供参考,保证井下施工质量和作业安全。

Foamed concrete has wide application prospects in underground filling and sealing field.Selecting suitable materials is an essential consideration in filling underground.The water absorption rate of foam concrete decreases with the increase of material density.In uniaxial and three axial compression tests,the strength of foam concrete increases with the increase of material density.Direct shear tests of foamed concrete show that the failure modes of concrete specimens with different densities are quite different,which can be roughly classified into three types.SHPB impact test shows that the increase of confining pressure can greatly improve the compressive strength and deformation properties of specimens.The above test results can provide reference for the filling and sealing effect of underground roadway,and ensure the underground construction quality and operation safety.