Self-repairing ultra-high performance concrete and preparation method thereof

The invention relates to self-repairing ultra-high performance concrete as well as a preparation method and application thereof. The concrete comprises the following raw materials: a super plasticizer, microcapsules and a curing agent in a mass ratio of (20-25): (12-16): 2, and other components, the preparation method of the concrete comprises the following steps: uniformly stirring the water and the super plasticizer; adding Portland cement, silica fume and quartz powder, and uniformly stirring; adding the capsule and the curing agent, and uniformly stirring; adding quartz sand, and uniformly stirring; adding steel fibers, and uniformly stirring to obtain a mixture; and pouring, forming and curing the mixture to obtain the self-repairing ultra-high performance concrete. Compared with the prior art, the average compressive strength is 130 MPa or above, microcracks are self-repaired, damage is eliminated, and the durability of UHPC can be greatly improved due to increase of the repaired tensile strength; the a