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A concrete water-retaining material

A water-retaining material and concrete technology, applied in the field of concrete, can solve the problems of unfavorable concrete strength, application limitations, complicated methods, etc., and achieve the effects of high water-retaining efficiency, crack suppression, and simple preparation process

Active Publication Date: 2020-06-02
CHINA HYDROELECTRIC ENGINEERING CONSULTING GROUP CHENGDU RESEARCH HYDROELECTRIC INVESTIGATION DESIGN AND INSTITUTE
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] The method for preparing the above-mentioned organic-inorganic composite material (that is, concrete water-retaining material) is very complicated, and since the organic polymer material in the prepared composite material is not effectively encapsulated but exposed, when it is mixed into concrete It will adversely affect the strength of concrete, and these defects limit its application

Method used

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Examples

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preparation example Construction

[0023] Specifically, a concrete water-retaining material is prepared by the following method:

[0024] A. Dissolve acrylamide, acrylic acid, sodium hydroxide, and N,N-methylenebisacrylamide in water, then add pumice powder, absorb and dry to obtain a composite material;

[0025] B. Sodium bisulfite and ammonium persulfate are dissolved in water to obtain solution A, and solution A is dripped into the composite material obtained in step A, and after dripping, the reaction obtains a crude product;

[0026] C. The crude product is soaked in a mixed solvent of ethanol and acetone to obtain a pure product, and the pure product is dried, crushed and ground to obtain a concrete water-retaining material.

[0027] In step A of the method of the present invention, the mass ratio of acrylamide, acrylic acid and sodium hydroxide is 1:3-5:0.5-0.8, and the mass of N,N-methylenebisacrylamide is 10%-10% of the mass of sodium hydroxide 30%; acrylamide, acrylic acid and N,N-methylenebisacrylam...

Embodiment 1

[0038] (1), preparation of concrete water-retaining material:

[0039] A. Dissolve 42g of acrylamide, 128g of acrylic acid, 24g of sodium hydroxide, and 2.8g of N,N-methylene bisacrylamide into 200mL of water and stir evenly, then add 800g of inorganic porous material pumice powder, fully stir and mix until After the pumice powder is adsorbed for half an hour, it is dried (it only needs to be dried on the surface, and there is no need to process the internal moisture) to obtain a composite material;

[0040] B. Take 0.3g of sodium bisulfite and 0.68g of ammonium persulfate and dissolve them in 500g of distilled water. After stirring evenly, slowly drop them into Into the composite material obtained in step A, after dropping, react at 20-30°C (normal temperature) for 1h to obtain a crude product;

[0041] C, crude product soak 2h in the mixed solvent (quality is 4 times of pumice powder quality) of ethanol and acetone, filter and wash, wash off residual unreacted monomer, obta...

Embodiment 2

[0057] (1), preparation of concrete water-retaining material:

[0058] A. Dissolve 44g of acrylamide, 128g of acrylic acid, 28g of sodium hydroxide, and 5.6g of N,N-methylenebisacrylamide in 240mL of water and stir evenly, then add 800g of inorganic porous material pumice powder, stir well, and wait until the pumice After the powder is adsorbed for half an hour, it is dried to obtain a composite material;

[0059] B. Take 0.3g of sodium bisulfite and 0.68g of ammonium persulfate and dissolve them in 600mL of distilled water. After stirring evenly, slowly drop them into the step In the composite material obtained in A, after dropping, react for 1 hour at 20-30°C (normal temperature) to obtain a crude product;

[0060] C, crude product soaks 2h in the mixed solvent (quality is 5 times of pumice powder quality) of ethanol and acetone, washes off residual unreacted monomer, obtains solid, and solid is dried to constant weight in vacuum oven, after crushing, Grind it to the requi...

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Abstract

The invention discloses a novel concrete water retaining material, and belongs to the field of concrete. The concrete water retaining material is prepared by the following steps: step A, dissolving acrylamide, acrylic acid, sodium hydroxide, and N,N-methylene bisacrylamide into water, then adding an inorganic porous material, and after adsorption, drying to obtain a composite material; step B, dissolving sodium hydrogen sulfite and ammonium persulfate into water to obtain a solution A, and dropwise adding the solution A into the composite material obtained in the step A to obtain a crude product; and step C, soaking the crude product in a mixed solvent of ethanol and acetone to obtain a pure product, and finally drying, grinding, and milling the pure product to obtain the concrete water retaining material. The provided concrete water retaining material is not influenced by external environment, the water retaining performance is excellent, the anti-cracking performance of concrete is obviously enhanced, at the same time, other properties of concrete are not affected; the preparation technology is simple, the raw materials are cheap, the cost is low, and the water retaining materialis worthy to popularize and use.

Description

technical field [0001] The invention belongs to the field of concrete and relates to a novel concrete water-retaining material. Background technique [0002] Concrete water-retaining material is an organic-inorganic combination material. The existing technical scheme adopts a synchronous method to prepare a composite cross-linked network polymer. The extent of the branch polymerization reaction; then, the inorganic polymer prepolymerization is carried out, and the prepolymerization solution is generally not stable, and the pH and temperature need to be adjusted to maintain its prepolymerization state; finally, when the free radical polymerization gradually progresses to the copolymerization stage, the pH of the solution will increase. Significant changes occur. At this time, the temperature should be properly controlled, the reaction rate should be reduced, and the prepolymerized inorganic polymer solution is added to the organic reaction solution to carry out "crosslinking-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/06C08F220/56C08F222/38C04B24/26C04B103/46
CPCC04B40/0039C04B2103/465C08F220/06C08F220/56C08F222/385C04B24/26C04B22/00
Inventor 徐中浩田先忠杨代六吴凤郑凯申天游夏铭
Owner CHINA HYDROELECTRIC ENGINEERING CONSULTING GROUP CHENGDU RESEARCH HYDROELECTRIC INVESTIGATION DESIGN AND INSTITUTE
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