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Early strength water reducing agent and preparation method thereof

A water-reducing agent and early-strength type technology, which is applied in the field of water-reducing agent and its preparation, can solve the problems of adjustment, small space for efficiency increase, slow cement hydration rate, and low number of crystal nuclei, and achieve short setting time, High early strength, effect of improving early strength

Active Publication Date: 2020-06-23
BEIJING ZHONGYANYI ENG TECH DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The type and performance of small molecule accelerators are limited, the adaptability of the product is poor, and there is not much room for adjustment and efficiency enhancement
In the prior art, the dispersed crystal nuclei of the stabilizer in the early strength agent are relatively large, and the particle diameter can only reach 80-200 nanometers; and the number of crystal nuclei per unit volume is low, and the cement hydration rate is relatively slow.

Method used

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  • Early strength water reducing agent and preparation method thereof

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preparation example Construction

[0068] An embodiment of the present invention proposes a method for preparing an early-strength water reducer, which includes:

[0069] Preparation of polycarboxylate water reducer: Mix acrylic acid, sodium methacrylsulfonate, 2-acrylamide-2-methylpropanesulfonic acid, acrylamide and water to obtain solution A; combine reducing agent, chain transfer agent and Mix with water to obtain solution B; mix polyether and water in a polymerization reactor, stir evenly and completely dissolve polyether, heat to 30-35°C, add initiator, stir for 5-10min, and drop solution A and Solution B, solution A is added dropwise within 2-2.5h, solution B is added dropwise within 2.5-3h; heat at 30-45°C to polymerize for 1-1.5h, add a regulator to adjust the pH value to 6-7, and mix well , to obtain polycarboxylate water reducer;

[0070] Preparation of nano crystal nucleus early strength agent: add polymer dispersant, calcium silicate, calcium nitrate, aluminum nitrate and water into the flask, stir ...

Embodiment 1

[0105] An embodiment of the present invention proposes a method for preparing an early-strength water reducer, which includes:

[0106] Preparation of polycarboxylate superplasticizer: Mix 18.2g of acrylic acid, 2.05g of acrylamide, 2.5g of sodium methacrylate, 6.3g of 2-acrylamide-2-methylpropanesulfonic acid and 48.7g of deionized water , to obtain solution A; 1g ascorbic acid, 0.721g mercaptoethanol and 12.4g deionized water were used to obtain solution B; Mix base polyoxyethylene ether with 135.2g deionized water, stir until completely dissolved, heat to 30°C, add 2.54g hydrogen peroxide, stir for 5-10min, add solution A and solution B dropwise at the same time, solution A will be added dropwise within 2h , Solution B was added dropwise within 2.5 hours; heated at 40°C to polymerize for 1 hour, added a regulator to adjust the pH value to 7, mixed evenly, and obtained a polycarboxylate superplasticizer;

[0107] Preparation of nanocrystalline nucleus accelerator: add 100 p...

Embodiment 2

[0119] An embodiment of the present invention proposes a method for preparing an early-strength water reducer, which includes:

[0120] Preparation of polycarboxylate superplasticizer: Mix 26g of acrylic acid, 3g of acrylamide, 4g of sodium methacrylate, 8g of 2-acrylamide-2-methylpropanesulfonic acid and 150g of deionized water to obtain solution A; 1.5g sodium bisulfite, 3g mercaptopropionic acid and 20g deionized water were used to obtain solution B; Mix oxyethylene ether with 70g deionized water, stir until completely dissolved, heat to 30°C, add 3g hydrogen peroxide, stir for 5-10min, add solution A and solution B dropwise at the same time, solution A is added dropwise within 2 hours, solution B is in The dropwise addition is completed within 3 hours; heat at 35°C to polymerize for 1.5 hours, add a regulator to adjust the pH value to 7, and mix well to obtain a polycarboxylate water reducer;

[0121] Preparation of nanocrystalline nucleus early strength agent: add 100 pa...

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Abstract

The invention relates to an early strength type water reducer and a preparation method thereof. The preparation method comprises steps as follows: acrylic acid, sodium methallyl sulfonate, 2-acrylamide-2-methylpropane sulfonic acid, acrylamide and water are mixed to obtain a solution A; a reducer, a chain transfer agent and water are mixed to obtain a solution B; polyether and water are mixed andheated, an initiator is added, the mixture is stirred, the solution A and the solution B are added, the mixture is heated for polymerization, a regulator is added to adjust the pH value to 6-7, and apolycarboxylate water reducer is obtained; a high polymer dispersant, calcium silicate, calcium nitrate, aluminum nitrate and water are mixed, the mixture is heated and stirred, a sodium silicate water solution is added, and a nano crystal nucleus early strength agent is obtained; the polycarboxylate water reducer and water are mixed, stirred and heated, the nano crystal nucleus early strength agent is added, the mixture is heated and stirred, and the early strength type water reducer is obtained. The early strength type water reducer is used for concrete and can make concrete have short setting time, high early strength and excellent work performance and adaptability.

Description

technical field [0001] The invention relates to a water reducer and a preparation method thereof, in particular to an early-strength type water reducer and a preparation method thereof. Background technique [0002] With the development of the construction industry, concrete in the 21st century is more advocating resource conservation and environmental friendliness. Precast concrete technology is more and more widely used in the field of municipal and construction projects. The super-high water-reducing rate of early-strength polycarboxylate water-reducing agent is used. Technology, using mineral fine powder admixtures and ordinary Portland cement, by adjusting the concrete mix ratio, to achieve ultra-low concrete water-binder ratio, so that the concrete can obtain high strength in the early stage and the method of stable growth in the later stage, the prepared super early strength Concrete has good working properties. The rapid development of early strength and the steady ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/24C04B24/16C08F283/06C08F220/06C08F228/02C08F220/58C08F220/56C04B103/30C04B103/12
CPCC04B24/165C04B40/0039C04B2103/12C04B2103/302C08F283/065C04B22/00C04B22/085C04B12/04C04B2103/408C08F220/585
Inventor 白杰许文英蔡阳王博
Owner BEIJING ZHONGYANYI ENG TECH DEV CENT
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