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采用正交试验研究了滑石粉的用量、玄武岩纤维的用量及长度对聚氨酯注浆材料的压缩、冲击和拉伸性能的影响。滑石粉含量为3%,玄武岩纤维含量为7%,纤维长度为5mm,聚氨酯注浆材料具有最佳的力学性能,压缩强度达25.567MPa、冲击强度达10.89kJ.m-2和拉伸强度达10.92MPa。SEM观察表明,增强材料充分填充于胞体密堆积后形成的空隙中,与聚氨酯机体结合紧密,挤压胞体,使泡孔的孔径减小。
The effects of the amount of talcum powder, the amount and length of basalt fiber on the compression, impact and tensile properties of polyurethane grouting materials were studied by orthogonal test. The content of talcum powder is 3%, basalt fiber content is 7%, fiber length is 5mm, polyurethane grouting material has the best mechanical properties, compressive strength of 25.567MPa, impact strength of 10.89kJ.m-2 and tensile strength up to 10.92MPa. The SEM observation shows that the reinforcing material is fully filled in the voids formed after the close packing of the cell body, tightly bound with the polyurethane body, and the cell body is squeezed to reduce the cell diameter of the cell body.