Performance and application of new modified polyurethane grouting material
LYU Guijie
PAN Youqiang
LI Kuan
HAN Jiang
Abstract：In order to meet the requirements of non foaming and flexibility of polyurethane grouting materials for semi-rigid base crack treatment when encountering water,modified polyurethane grouting materials were successfully prepared using prepolymers,polyethers,catalysts,silane coupling agents,and modifiers as raw materials.The curing time and mechanical properties of the modified polyurethane grouting materials were studied,and the microstructure composition was analyzed by infrared spectroscopy.Finally,the road performance of the modified polyurethane grouting materials was evaluated based on actual engineering.The results showed that the modified polyurethane grouting material does not foam when exposed to water and can be cured in 90 seconds.The tensile strength is 3.3 MPa,the elongation at break can reach 270%,and the bonding strength can reach 2.3 MPa.It can adapt to the hu-mid environment of semi-rigid base cracks and cooperate with road deformation.It is mainly composed of polyurea/polyurethane and modifier gel particles generated by the reaction of prepolymer with water and polyether polyol in the modifier.Engineering applica-tions have shown that modified polyurethane grouting materials can effectively treat semi-rigid base crack diseases.
Keywords：road engineeringmodified polyurethanetensile testmechanical propertiesmicrostructure
Publication Date：2025-07-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 21-25 )