A kind of polymer modifier for concrete, preparation method and anti-seepage and waterproof concrete

Abstract

The invention discloses a polymer modifier for concrete, which comprises a polymer emulsion and an interface modifier, and the interface modifier includes silica sol and a silane coupling agent; the addition amount of the polymer emulsion and the interface modifier 1:0.2~1; the preparation method is to weigh the polymer emulsion, silica sol and silane coupling agent according to the weight ratio; mix the silica sol, silane coupling agent and polymer emulsion and obtain the mixed solution by ultrasonic treatment ; An anti-seepage and waterproof concrete, comprising 230 to 360 parts of cement, 60 to 100 parts of fly ash, 28 to 50 parts of expansion agent, 650 to 820 parts of fine aggregate, and 950 to 1100 parts of coarse aggregate , 4.35 to 5.85 parts of water reducing agent, 100 to 150 parts of water, 0.85 to 1.35 parts of defoamer and 40 to 80 parts of polymer modifier. The invention can increase the dispersibility of the polymer liquid emulsion in the cement system through the interface modifier, enhance the cohesive force between the polymer emulsion and the cement, enhance the strength of the concrete, and increase the impermeability and water resistance of the concrete.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a polymer modifier for concrete, a preparation method and an impermeable and waterproof concrete. Background technique [0002] During the construction of some tunnels, halite rock formations were discovered, which have high chloride content and high chloride ion concentration in the seepage water in the tunnels. The halite is a soluble chemical sedimentary rock, which has the characteristics of dissolution and chemical erosion. It has strong karst characteristics when it encounters water. At the same time, the groundwater solution in the salt rock area generally has different degrees of chemical erosion to the reinforced concrete structure of the tunnel project. . After the concrete is constructed, the water on the concrete surface is easy to dissipate under environmental factors, and the chloride ions and water molecules in the environment are easily ad...

AI Technical Summary

Problems solved by technology

However, because the active silica in the cement-based silicate is easily competed between the polymer emulsion and the cement-based cementitious material, the hydration of the cement is not complete, and the cement particles are clustered and aggregated, thereby forming cavities between the concrete and the concrete. Poor hardness, poor impermeability and waterproof effect

Wherein the dispersant is sodium dodecylbenzenesulfonate, yet sodium dodecylbenzenesulfonate cannot solve the above-mentioned problems, and in the cement-based cementitious material that polymer emulsion exists, dodecylbenzenesulfonate The dispersing effect of sodium phosphate is poor, resulting in poor impermeability and water resistance of concrete

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