Mix-free, rapid-infiltration, and quick-setting road repair material based on MPC

A new kind of mix-free, rapid-infiltration, and quick-setting road repair material based on MPC is prepared and experimentally studied. Compared to traditional road repair methods that rely on construction machinery and mixing equipment, these new types of materials can be directly poured into craters filled with coarse aggregates without any mixing. They can infiltrate under gravity and rapidly harden, thus achieving the desired road repair effects. To modify these materials, the optimal gradation and void ratio of coarse aggregates were first determined using the PSO method. Then, the properties of MPC were optimized to achieve good overall performance. Experimental results testify to an optimal coarse aggregate gradation, meanwhile demonstrating the enhanced effects of sodium silicate on the fluidity and strength of MPC. Besides, layered filling can effectively improve emergency repair efficiency. The 4-hour compressive strength of MPC reaches 7.5 MPa.