Bridge joint ultrahigh crack-resistance concrete and preparation method thereof

Abstract

The invention relates to bridge joint ultrahigh crack-resistance concrete and a preparation method thereof. The concrete is prepared from cement, silica fume, diatomite, slag powder, red sandstone powder, polycarboxylate water reducing agent, steel fibers, polyacrylonitrile fibers and water. The preparation method comprises the following steps: uniformly mixing and stirring the cement, the slag powder and the red sandstone powder, and obtaining a cement mixture; then mixing the silica fume, the diatomite, the steel fibers and the polyacrylonitrile fibers, uniformly stirring, and obtaining a silica fume mixture; dissolving the polycarboxylate water reducing agent in water, and obtaining an additive aqueous solution; adding half of the additive aqueous solution into the cement mixture, and uniformly stirring; adding the remaining additive aqueous solution into the silica fume mixture, and uniformly stirring; and finally uniformly stirring the obtained mixture. The concrete of the invention has excellent crack resistance and durability, the flexural crack resisting strength is greater than 40MPa, the breaking strength is greater than 10J / m<2>, the chlorine ion permeation resistance can reach grade RCM-V, and the pressure resisting strength is not less than 150MPa.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a concrete with super high crack resistance for bridge joints and a preparation method thereof. Background technique [0002] Since the concept of ultra-high performance concrete was first proposed by Larrard et al. in 1994, ultra-high performance concrete has shown very superior performance, such as compressive strength reaching more than 150MPa, which is much higher than that of ordinary concrete, and has excellent fracture toughness, fracture energy and Anti-chloride ion permeability, strong anti-carbonation and sulfate penetrant ability, there are a large number of unhydrated cement particles, so that the concrete has a self-repairing function, light weight, reduces the weight of the structure, saves costs, and reduces the cost. [0003] The good mechanical and physical properties of ultra-high performance concrete materials make it popularized as the m...

AI Technical Summary

Problems solved by technology

However, its raw material cost is high, the proportion of silica fume is high, the viscosity coefficient of concrete is large, the use of concrete cementitious materials is large, the heat of hydration is high, and it is not easy to form self-compacting, which limits the wide application of ultra-high performance concrete in the construction industry. use and development