Research and Practice of Roadbed and Pavement Disease Treatment with Cement-Emulsified Bitumen Composite Grouting Material

Through the analysis of the common roadbed and pavement diseases such as cavity beneath slab and pumping, and their current treatment situation, the author proposed the idea of improving and resuming the loading capacity and waterproof performance of highway through intercalating a waterproof bonding layer between base and slab. The author has developed a new composite grouting material composed of an environmentally friendly powdery inorganic component and an emulsified bitumen component to solve the technical issue of the pressure grouting of emulsified bitumen. Their practices show that the material can combine the excellent waterproofing behavior of bitumen and the high-strength of cement and adjust its rigidity to be suitable for different road structures. Through the grouting treatment by the new material, the stress state of roadbed and slab can be significantly improved and the carrying capacity can be resumed at reasonable cost/performance ratio.