Polymer modifier for concrete, preparation method thereof, and impermeable and waterproof concrete

Abstract

The invention discloses a polymer modifier for concrete. The polymer modifier for concrete comprises a polymer emulsion and an interface modifier, and the interface modifier comprises silica sol and asilane coupling agent; and the addition amount of the polymer emulsion to the interface modifier is 1:(0.2-1). A preparation method of the polymer modifier comprises the following steps: weighing thepolymer emulsion, the silica sol and the silane coupling agent according to the weight ratio; mixing the silica sol, the silane coupling agent and the polymer emulsion, and performing ultrasonic treatment to obtain a mixed solution. An impermeable and waterproof concrete comprises 230-360 parts of cement, 60-100 parts of fly ash, 28-50 parts of an expanding agent, 650-820 parts of fine aggregate,950-1100 parts of coarse aggregate, 4.35-5.85 parts of a water reducing agent, 100-150 parts of water, 0.85-1.35 parts of an antifoaming agent and 40-80 parts of the polymer modifier. The interface modifier can enhance the dispersity of the polymer emulsion in the cement system, enhance the binding power between the polymer emulsion and cement, enhance the strength of the concrete and enhance theimpermeability and waterproofness 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 impervious and waterproof concrete. Background technique [0002] During the construction of some tunnels, rock-salt strata were found, which contained high chloride salts, and the seepage water in the tunnels had a relatively high concentration of chloride ions. 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 construction of concrete is completed, under environmental factors, the moisture on the concrete surface is easy to lose, and the chloride ions and water molecules in the envir...

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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