Experimental Study on the Effect of Redispersible Latex Powder on Pavement Performance of Road Base

Through unconfined compressive strength test, flexural tensile strength test, freeze-thaw test, dry shrinkage test and SEM, the improvement effect and mechanism of redispersible latex powder on the mechanical properties of recycled cement stabilized macadam were studied. The results show that the flexural and tensile strength of recycled cement stabilized macadam mixture increased and the compressive strength decreased slightly after adding latex powder. With the addition of latex powder, the BDR value of cement stabilized macadam increased, and the frost resistance of the mixture improved. Adding latex powder can reduce the shrinkage strain and shrinkage coefficient of cement stabilized macadam, and significantly improve its crack resistance. SEM images show that the latex powder polymer forms a network-like connection structure in the mixture, which can absorb the shrinkage deformation of mineral particles and hydration products in the material, and significantly reduce the shrinkage strain of the specimen.