A kind of polymer modifier for concrete, preparation method and anti-seepage and waterproof concrete
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An anti-seepage and waterproof concrete technology, applied in the field of composite materials, can solve the problems of poor concrete anti-seepage and water resistance, cement particle aggregation, incomplete cement hydration, etc., to avoid incomplete hydration, reduce interfacial tension, and improve anti-seepage. Osmotic effect
Active Publication Date: 2022-06-17
中铁二局第二工程有限公司
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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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preparation example Construction
[0020] The invention provides a preparation method of a polymer modifier for concrete, comprising the following steps:
[0021] S1 weighs polymer emulsion, silica sol and silane coupling agent by weight;
[0022] S2: After mixing the silica sol, the silane coupling agent and the polymer emulsion, the mixed solution is obtained by ultrasonic treatment. The ultrasonic conditions are as follows: ultrasonic time is 3 min to 10 min, and ultrasonic is carried out at room temperature.
[0023] The present invention provides an impermeable and waterproof concrete, comprising the following components by weight: 230-360 parts of cement, 60-100 parts of fly ash, 28-50 parts of expansion agent, 650-820 parts of fine Aggregate, 950-1100 parts of coarse aggregate, 4.35-5.85 parts of water reducing agent, 100-150 parts of water, 0.85-1.35 parts of defoamer and 40-80 parts of polymer modifier. The impermeable and waterproof concrete prepared by the invention has good impermeability and water...
Embodiment 1
[0033]A polymer modifier for concrete, comprising a polymer emulsion and an interface modifier, the interface modifier includes silica sol and a silane coupling agent; the addition amount of the polymer emulsion and the interface modifier is 1:0.2 . The polymer emulsion is a styrene-acrylic emulsion.
[0034] Its preparation method is,
[0035] S1 weighs polymer emulsion, silica sol and silane coupling agent by weight;
[0036] S2 mixes the silica sol, the silane coupling agent and the polymer emulsion to obtain a mixed solution by ultrasonic treatment. The ultrasonic conditions are that the ultrasonic time is 5 min, and the ultrasonic is carried out at room temperature.
Embodiment 2
[0038] The difference between this example and Example 1 is that the addition amount of the polymer emulsion and the interface modifier is 1:0.4.
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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...
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