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Compound efficient hardening-accelerating and water-reducing admixture used for concrete

An early-strength water-reducing agent and concrete technology, which is applied in the field of concrete additives, can solve the problems of increasing the cost of water-reducing agents, excessive concrete slump, and weakening water-reducing performance, so as to prevent agglomeration, save manpower, The effect of excellent performance

Inactive Publication Date: 2018-02-23
马多浩
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above patents all have the problem of weakening the water-reducing performance while producing the early-strength function. In order to ensure the water-reducing performance, the measure of increasing the amount of the water-reducing agent will cause the phenomenon of excessive slump or segregation of the concrete, and increase The use cost of water reducing agent

Method used

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  • Compound efficient hardening-accelerating and water-reducing admixture used for concrete
  • Compound efficient hardening-accelerating and water-reducing admixture used for concrete
  • Compound efficient hardening-accelerating and water-reducing admixture used for concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037](1) Add water to 20g of soil-grade polyglutamic acid and 10g of hydrolyzed polymaleic anhydride under stirring until completely dissolved, add dropwise 5wt% dilute sulfuric acid solution to adjust the pH value to 3-4, then add 40g of polyethylene glycol mono Methyl ether 750, add water until the polyethylene glycol monomethyl ether 750 is completely dissolved, then heat to reflux state and keep stirring for 3 hours, the resulting mixture is concentrated under reduced pressure into a paste with a solid content of 45-55%, and the mixture is heated at 5°C / min The cooling speed is lowered to 0-5°C and kept stirring for 30 minutes, and finally sent to a freeze dryer, and the dried solid is made into a fine powder by an ultrafine pulverizer to obtain an ester polymer compound;

[0038] (2) Heat the ester polymer compound to 115-125°C and keep stirring for 5 minutes, add 5g of allyl glycidyl ether and 2g of diacetone acrylamide, continue to keep warm and stir for 30 minutes at 1...

Embodiment 2

[0042] (1) Add water to 15g soil-grade polyglutamic acid and 5g hydrolyzed polymaleic anhydride under stirring until completely dissolved, add dropwise 5wt% dilute sulfuric acid solution to adjust the pH value to 3-4, then add 35g polyethylene glycol mono Methyl ether 750, add water until the polyethylene glycol monomethyl ether 750 is completely dissolved, then heat to reflux state and keep stirring for 3 hours, the resulting mixture is concentrated under reduced pressure into a paste with a solid content of 45-55%, and the mixture is heated at 5°C / min The cooling speed is lowered to 0-5°C and kept stirring for 30 minutes, and finally sent to a freeze dryer, and the dried solid is made into a fine powder by an ultrafine pulverizer to obtain an ester polymer compound;

[0043] (2) Heat the ester polymer compound to 115-125°C and keep stirring for 5 minutes, add 3g of allyl glycidyl ether and 3g of diacetone acrylamide, continue to keep warm and stir for 30 minutes at 115-125°C,...

Embodiment 3

[0047] (1) Add water to 20g of soil-grade polyglutamic acid and 10g of hydrolyzed polymaleic anhydride under stirring until completely dissolved, add dropwise 5wt% dilute sulfuric acid solution to adjust the pH value to 3-4, then add 40g of polyethylene glycol mono Methyl ether 750, add water until the polyethylene glycol monomethyl ether 750 is completely dissolved, then heat to reflux state and keep stirring for 3 hours, the resulting mixture is concentrated under reduced pressure into a paste with a solid content of 45-55%, and the mixture is heated at 5°C / min The cooling speed is lowered to 0-5°C and kept stirring for 30 minutes, and finally sent to a freeze dryer, and the dried solid is made into a fine powder by an ultrafine pulverizer to obtain an ester polymer compound;

[0048] (2) Heat the ester polymer compound to 115-125°C and keep stirring for 5 minutes, add 5g of allyl glycidyl ether and 2g of diacetone acrylamide, continue to keep warm and stir for 30 minutes at ...

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Abstract

The invention discloses a composite high-efficiency early-strength water reducer for concrete, relates to the technical field of concrete additives, and is made of the following raw materials in parts by weight: polyethylene glycol monomethyl ether 750 35-40 parts, 15‑20 parts of soil grade polyglutamic acid, 5‑10 parts of hydrolyzed polymaleic anhydride, 5‑10 parts of superfine wollastonite powder, 1‑5 parts of allyl glycidyl ether, 1‑5 parts of diacetone acrylamide 1-5 parts of dilauryl thiodipropionate, 0.5-3 parts of isomeric tridecyl polyoxyethylene ether, and 0.5-3 parts of sodium gluconate. The early-strength superplasticizer prepared by the present invention can show excellent performance when its dosage is 2% of the cement content, the water reducing rate can reach more than 33%, the initial setting time is less than 135min, and the final setting time is less than 200min , 28d compressive strength reaches above 45MPa.

Description

Technical field: [0001] The invention relates to the technical field of concrete additives, in particular to a composite high-efficiency early-strength water reducer for concrete. Background technique: [0002] With the rapid development of social economy, the requirements for concrete are getting higher and higher. According to statistics, more than 80% of commercial concrete is mixed with concrete admixtures to improve performance and meet construction requirements. At present, concrete admixtures are mainly developed in the direction of high efficiency, multi-function and compounding. The use of composite admixtures can improve the stability of fresh concrete, such as no segregation, no bleeding, etc., and can also adjust the hydration and hardening process of cement, such as delaying the heat release of hydration, early strength, high strength, etc. [0003] As the representative of the third-generation water reducer, polycarboxylate water reducer has been widely used ...

Claims

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Application Information

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IPC IPC(8): C04B24/32C04B28/02C04B103/30
CPCC04B40/0039C04B28/02C04B2103/302C04B2201/50C04B24/32C04B24/123C04B24/2664C04B14/043C04B24/023C04B24/124C04B24/045C04B24/10C04B14/06C04B14/02
Inventor 马多浩
Owner 马多浩
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