Preparation and optimization of polyurethane foam caulk and its application in high-strength composite roadbed
The one-component polyurethane foam caulk used in the process of optimizing the durability of high-strength composite roadbed was prepared and applied to solve the problem of low durability of high-strength composite roadbed.According to the mix ratio,the prepared materials were pretreated,and the one-component poly-urethane foam caulk was prepared according to different material ratios and placed for 24 h.According to the char-acteristics of a railway engineering subgrade,a high-strength composite subgrade specimen was prepared,and the durability of the subgrade specimen was tested.The prepared one-component polyurethane foam caulk is applied to the prepared high-strength composite subgrade sample,and after the caulking was completed,the caulking speci-men was cured,and the subgrade specimens were numbered.The Marshall stability meter was used to test the water seepage resistance of the caulked subgrade specimens,the electronic universal testing machine was used to test the flexural tensile strength of the caulked subgrade specimens,and the test results of the two tests were recorded.In the water infiltration resistance test,after soaking the roadbed specimen in water for 48 hours at a temperature of 60℃,the Marshall stability of A02 roadbed specimen was the highest,which was 14.5.In the flexural tensile strength test,the A02 roadbed specimen had the highest flexural tensile strength value,which was 562.36 MPa.The results show that the one-component polyurethane foam caulk with 60% polyurethane prepolymer can effective-ly improve the water permeability and flexural tensile strength of the high-strength composite subgrade,and opti-mize the durability of the subgrade.
one component polyurethane foam sealanthigh strength composite roadbeddurability performancerailway subgradedurability optimizationdurability of roadbed
万方数据
维普
