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A kind of concrete reducer and preparation method thereof

A glue reducer and concrete technology, which is applied in the field of concrete glue reducer and its preparation, can solve the problems of inhibiting the dispersion of glue reducer on cement particles, increasing the viscosity of concrete mixture, and affecting the encapsulation of cement to aggregate. Achieve the effect of improving wrapping property, reducing cement consumption and high water reducing rate

Active Publication Date: 2021-10-15
深圳市三绿科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Natural sand has rounded particles and smooth surface. It is the fine aggregate used in traditional concrete. However, due to years of mining, natural sand resources are becoming less and less, resulting in a gradual increase in its price. Machine-made sand has sufficient raw materials and low prices, so Gradually replace or partially replace natural sand and become the fine aggregate of concrete; however, compared with natural sand, the grain shape of machine-made sand is not round enough, the particles are sharp and angular, the content of stone powder is high, and the water demand is large. When the stone powder content is too high, it will increase the viscosity of the concrete mixture, which will not only affect the dispersibility of cement particles, but also inhibit the dispersibility of the cement particles by the reducer, so that the traditional reducer cannot perform well. The role of cement affects the encapsulation of aggregates, resulting in bleeding and segregation of concrete, thus affecting the workability of concrete

Method used

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  • A kind of concrete reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0037] Preparation example 1 of polycarboxylate water reducer: ① Take 12.5kg of acrylic acid, 4kg of acrylamide, 1.5kg of hydroxyethyl methacrylate, 0.3kg of isobutyl methacrylate, 2.5kg of sodium methacrylate, 0.25 kg alpha-alkenyl sulfonate sodium and 55kg water, stir evenly to obtain mixed solution A;

[0038] ②Take 0.15kg of mercaptopropionic acid, 0.3kg of ammonium persulfate, 0.1kg of ascorbic acid and 12.5kg of water, and mix well to obtain the mixed solution B;

[0039] ③Take 50kg of methallyl alcohol polyoxyethylene ether and 60kg of water, raise the temperature to 48°C, add the mixed solution B, stir for 1.5h, then add the mixed solution A, dropwise after 3.5h, then add 100kg of water, at 48°C At a certain temperature, keep stirring for 3.5 hours, and then add 10wt% sodium hydroxide solution to adjust the pH of the system to 7 to obtain a polycarboxylic acid-based water reducer.

preparation example 2

[0040] Preparation example 2 of polycarboxylate water reducer: ① Take 10kg of acrylic acid, 3kg of acrylamide, 1kg of hydroxyethyl methacrylate, 0.2kg of isobutyl methacrylate, 2kg of sodium methacrylate, 0.2kg of α-ene Sodium sulfonate and 50kg water are stirred evenly to obtain mixed solution A;

[0041] ②Take 0.1kg of thioglycolic acid, 0.225kg of ammonium persulfate, 0.075kg of ascorbic acid and 10kg of water, and mix well to obtain the mixed solution B;

[0042] ③Take 40kg of methallyl alcohol polyoxyethylene ether and 50kg of water, raise the temperature to 45°C, add the mixed solution B, stir for 1 hour, add the mixed solution A, drop it in 3 hours, then add 100kg of water, at a temperature of 45°C Then, keep stirring for 3 hours, and then add 10wt% sodium hydroxide solution to adjust the pH of the system to 6 to obtain a polycarboxylic acid-based water reducer.

preparation example 3

[0043] Preparation example 3 of polycarboxylate water reducer: ① Take 15kg of acrylic acid, 5kg of acrylamide, 2kg of hydroxyethyl methacrylate, 0.4kg of isobutyl methacrylate, 3kg of sodium methacrylate, 0.3kg of α-ene Sodium sulfonate and 60kg water are stirred evenly to obtain mixed solution A;

[0044] ②Take 0.2kg of mercaptopropionic acid, 0.375kg of ammonium persulfate, 0.125kg of ascorbic acid and 15kg of water, and mix well to obtain the mixed solution B;

[0045] ③Take 60kg of methallyl alcohol polyoxyethylene ether and 70kg of water, raise the temperature to 50°C, add the mixed solution B, stir for 2 hours, add the mixed solution A, drop it in 4 hours, then add 100kg of water, at a temperature of 50°C Then, keep stirring for 4 hours, then add 10wt% sodium hydroxide solution to adjust the pH of the system to 8 to obtain a polycarboxylic acid-based water reducer.

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Abstract

The invention discloses a concrete glue reducer and a preparation method thereof, and relates to the technical field of concrete admixtures. The main point of the technical solution is a concrete glue reducer, which is prepared by diluting a mother liquor with water, and calculated as 100 parts by weight of the mother liquor. It includes the following components: 45-55 parts of mixed alcohol amine, 4-6 parts of anhydrous sodium metasilicate, 5-7 parts of lithium silicate, 15-20 parts of sodium methyl silicate, and the balance is water. The concrete glue reducer of the invention has the advantages of reducing the amount of cement used, improving the fluidity of the concrete mixture and the encapsulation of the aggregate by the cement, thereby improving the workability of the concrete.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, more specifically, it relates to a concrete adhesive reducer and a preparation method thereof. Background technique [0002] Ordinary concrete is made of cement as the main cementitious material, mixed with water, sand, stones, a certain amount of chemical admixtures and mineral admixtures when necessary, mixed in an appropriate proportion, and is formed by stirring, compacting, curing and hardening. artificial stone. Concrete is a new type of concrete admixture that is different from concrete water reducing agents. Admixtures are also called concrete synergists or concrete strengthening agents. Their main functions are to improve the workability of concrete, increase the overall glue volume of concrete, and promote The hydration reaction of cement is more sufficient to reduce the amount of cement or other cementitious materials, thereby reducing problems such as cracks on the concre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F2/04C04B24/42
CPCC04B40/0039C04B24/122C04B12/04C04B24/42C04B22/002
Inventor 庞森林庞永献易钢招
Owner 深圳市三绿科技有限公司
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