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High-temperature-resistant special water-retaining admixture for concrete as well as preparation process and application of admixture

A technology of high temperature resistance and admixture, applied in the field of concrete admixture, can solve the problems of sensitivity, affecting pumping effect, accelerating concrete evaporation, etc., and achieves the effect of not easy to segregate bleeding and good water locking effect

Active Publication Date: 2019-06-11
杭州构建新型材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Throughout the year, building construction is carried out, but the temperature has a greater impact on the concrete mixture
[0003] When the temperature is too high, it will accelerate the evaporation of the water added in the concrete, resulting in poor slump of the concrete, and ultimately affecting the pumping effect
[0004] Especially for concrete with machine-made sand, even if a water-reducing agent is added to the concrete, the added water-reducing agent will have a sensitive adverse effect on the mud powder carried by the machine-made sand, and it is easy to reduce the water-reducing agent. water effect

Method used

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  • High-temperature-resistant special water-retaining admixture for concrete as well as preparation process and application of admixture
  • High-temperature-resistant special water-retaining admixture for concrete as well as preparation process and application of admixture
  • High-temperature-resistant special water-retaining admixture for concrete as well as preparation process and application of admixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Example 1: A special water-retaining admixture for high-temperature resistant concrete, the components included and their corresponding mass content are as shown in Table 1, and are prepared by the following steps:

[0075] Step 1: Mix the sustained-release polycarboxylic acid and the comprehensive polycarboxylic acid for 15 minutes to obtain a first mixture;

[0076] Step 2: Add retarder, biomass glue, and water to the first mixture obtained in Step 1, and mix for 15 minutes to obtain a second mixture;

[0077] Step 3: Add defoamer to the second mixture obtained in Step 2, after mixing for 5 minutes, add the air-entraining agent in parts by weight, and mix for 10 minutes to obtain a water-retaining admixture.

[0078] Among them, the retarder is sodium gluconate; the biomass glue is xanthan gum; the defoamer is a polyether modified silicone defoamer, the model is 878; the air-entraining agent is air-entraining agent AE-2.

[0079] The preparation process of sustained-release pol...

Embodiment 2-7

[0089] Example 2-7: A special water-retaining admixture for high temperature resistant concrete. The difference from Example 1 is that the included components and their corresponding qualities are shown in Table 1.

[0090] Table 1 The components included in Examples 1-7 and their corresponding masses (kg)

[0091]

Embodiment 8

[0092] Example 8: A special water-retaining admixture for high-temperature resistant concrete. The difference from Example 1 is that the retarder is molasses and sodium lignosulfonate with a mass ratio of 2.3:1.

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Abstract

The invention discloses a high-temperature-resistant special water-retaining admixture for concrete as well as a preparation process and application of the admixture. The admixture comprises the following components: 1-5 parts of a sustained-release polycarboxylic acid, 5-20 parts of a comprehensive polycarboxylic acid, 1-10 parts of a retarder, 0.1-2 parts of a biomass glue, 0.1-5 parts of an airentraining agent, 0.1-5 parts of a defoaming agent, and 63.8-92.97 parts of water, wherein the sustained-release polycarboxylic acid is composed of isopentenyl polyoxyethylene ether, water, acrylic acid, hydroxyethyl acrylate, sodium methallyl sulfonate and ammonium persulfate, and the comprehensive polycarboxylic acid is composed of isobutylene polyoxyethylene ether, water, acrylic acid, tartrate acrylate, ascorbic acid and mercaptopropionic acid. The water-retaining admixture provided by the invention has a better water-retaining effect, and the preparation process provided by the inventionmakes the obtained admixture less prone to overpolymerization; and according to the application of the water-retaining admixture, the concrete can maintain a better water lock effect for a long timein a high-temperature environment in summer, so that the phenomenon of blocking of a pumping pipe when the concrete is pumped is not easy to cause.

Description

Technical field [0001] The invention relates to the technical field of concrete admixtures, and more specifically, it relates to a special water-retaining admixture for high-temperature resistant concrete and its preparation process and application. Background technique [0002] Concrete is currently the most used building material in civil engineering, and concrete structure is the main structural form of buildings. Construction is ongoing throughout the year, but temperature has a greater impact on the concrete mixture. [0003] When the temperature is too high, it will accelerate the evaporation of the added water in the concrete, resulting in the deterioration of the slump of the concrete, and ultimately affecting the pumping effect. [0004] Especially for concrete with machine-made sand, even if a water-reducing agent is added to the concrete, the added water-reducing agent will have a sensitive and adverse effect on the mud carried by the machine-made sand, and it is easy to ...

Claims

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Application Information

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IPC IPC(8): C04B24/42C04B24/16C04B24/26C08F283/06C08F220/06C08F220/20C08F228/02C08F220/28C04B103/46
Inventor 岳丕乔吴家栋周虓梁世崎
Owner 杭州构建新型材料有限公司
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