Hydraulic engineering anti-cracking concrete and preparation method thereof

Abstract

The invention relates to hydraulic engineering anti-cracking concrete and a preparation method thereof, and relates to the field of durability of concrete. The hydraulic engineering anti-cracking concrete is prepared from the following raw materials in percentage by weight: 9.5 to 13.5 percent of P.O42.5 cement, 40 to 50 percent of cobblestone, 25.5 to 30 percent of region II medium sand, 5 to 15 percent of mineral admixture, 0.1 to 0.15 percent of nano mineral fiber, 0.009 to 0.075 percent of an air entraining agent, and 6.5 to 8 percent of water. The hydraulic engineering anti-cracking concrete has the beneficial effects that all components form a uniform microscopic structure by closest packing of concrete, the deleterious porosity in the concrete is reduced, the compactness of the concrete is increased, and the durability of the concrete is improved; the adopted nano mineral fibers belong to natural clay minerals, the storage quantity is large, and the nano mineral fibers are easily obtained; the water absorbing capacity in the concrete is strong, more space is easily provided for cement hydration, the pore structure of the concrete can be refined, the tensile capacity of the concrete is increased, and the early shrinkage of the concrete is reduced; moreover, compared with common concrete, the raw materials adopted in the hydraulic engineering anti-cracking concrete are low in cost and convenient to transport, thereby greatly improving the economical efficiency.

Description

technical field [0001] The invention relates to the field of concrete durability, in particular to an anti-cracking concrete for hydraulic engineering and a preparation method thereof. Background technique [0002] Hydraulic concrete is often used in concrete projects such as gates and dams. Generally, it has a large area and a thin thickness, and it has been in contact with pressurized water or exposed to air for a long time. The problem of early cracking is common in existing concrete projects, hydraulic concrete is no exception, and the cause of concrete cracking is mainly caused by the shrinkage of concrete. Concrete shrinkage includes plastic shrinkage, drying shrinkage, autogenous shrinkage, carbonation shrinkage, and temperature-induced deformation, among which drying shrinkage and autogenous shrinkage are particularly important for concrete cracking. When shrinkage occurs inside the concrete and the shrinkage stress is greater than the tensile strength of the concre...

AI Technical Summary

Problems solved by technology

[0004] The invention provides an anti-cracking concrete for hydraulic engineering and its preparation method to solve the problem of cracking caused by various factors such as environmental conditions, its own structure, building materials, construction, etc.