Self-repairing cement for thermal damage tunnel

The invention relates to the technical field of building materials, in particular to self-repairing cement for a thermal damage tunnel, the self-repairing cement is prepared from the following raw materials in percentage by mass: 67-89.5% of component A, 10-20% of component B, 0-10% of clay brick powder, 0.5-2% of CaCO3 whisker and 0-1% of water-retaining agent; each of the component A and the component B comprises 90-95% of self-repairing cement clinker and 5-10% of dihydrate gypsum; the self-repairing cement clinker is prepared from 20-30% of C3S, 35-55% of C2S, 1-3% of C3A, 17-26% of C4AF and 4-8% of MgO; the size of periclase in the self-repairing cement clinker of the component A is less than 1 [mu] m; the size of periclase in the self-repairing cement clinker of the component B is 35 [mu] m, and the particle size of 47-69% of the component B is greater than 65 [mu] m. Through the self-repairing cement, the problems of early structural damage, wide later cracks and poor durability of lining concrete can