Effect of carbon black on the liquidity and compression performance of Polyurethane-Based tunnel isolation materials

Cross-sea engineering plays a vital role in the development of human society. However, due to geological constraints, cross-sea tunnels, as the main form of cross-sea engineering structures, are susceptible to instability and safety risks under strong seismic forces. Therefore, the development of tunnel isolation materials with strong elasticity and toughness is of great significance. In this study, a polyurethane-based tunnel isolation material was developed, and its liquidity, compression performance, and microstructure were investigated. The results show that, due to the improvement of the polyurethane microphase separation structure by carbon black, the compression performance of the material can be effectively enhanced, with a compressive strength of up to 1.88 MPa. Additionally, the material's liquidity meets construction requirements, and its elastic modulus is relatively low, around 15 MPa, which meets the requirements for isolation.