Super-early-strength high-strength concrete and preparation method thereof

Abstract

The invention relates to super-early-strength high-strength concrete, and relates to the technical field of building materials. The super-early-strength high-strength concrete comprises the following components by weight: 770-790 parts of a cementing material, 650-670 parts of coarse aggregate, 650-670 parts of fine aggregate, 124-130 parts of an admixture, 170-175 parts of water, and 1-2 parts of a shrinkage compensation agent, wherein the admixture is prepared from the following components in parts by weight: 0.02 to 0.03 part of an early strength component, 0.10 to 0.12 part of a delayed coagulation component, 0.05 to 0.07 part of an air entraining and water retention component and 0.80 to 0.82 part of a water reducing component. The preparation method of the super-early-strength high-strength concrete comprises the steps of uniformly stirring the coarse aggregate, the fine aggregate and the cementing material; adding the admixture and the shrinkage compensation agent, and uniformly stirring; adding the water and stirring until slurry appears; and continuously stirring uniformly to obtain the super-early-strength high-strength concrete. The 3h compressive strength of the prepared super-early-strength high-strength concrete is greater than or equal to 55 MPa, the 5h compressive strength is greater than or equal to 65 MPa, the 1d compressive strength is greater than or equal to 80 MPa, and the problems that common concrete is long in hardening time and slow in strength growth are solved.

Description

technical field [0001] The application relates to the technical field of building materials, in particular to an ultra-early-strength high-strength concrete and a preparation method thereof. Background technique [0002] In the construction of modern bridges and roads, local damage to the structure is usually repaired to ensure the quality and safety of the structure. The traditional process of repairing construction is generally to first remove the damaged concrete, then chisel the interface, apply interface agent, and finally pour new concrete. When using traditional technology for repairing construction, since the final setting time of new concrete is generally more than 8 to 10 hours, it takes a long time to cut off traffic, and the adaptability to bridges or roads with high traffic pressure is poor. [0003] In the related technology, adopting ordinary concrete with slightly higher strength grade than the original concrete for pavement repair, although it can solidify ...

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Problems solved by technology

[0004] The embodiment of the present application provides a super-early-strength high-strength concrete and its preparation method to solve the problems of low strength of ordinary concrete, long hardening time, and weak bonding between new and old concrete in the related art

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