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Super retarder for concrete

A super retarder and concrete technology, which is applied in the field of concrete super retarder, can solve the problems of reducing the strength of concrete in the later stage and increasing construction costs, and achieve the effects of improving quality stability, compressive strength and good compatibility

Active Publication Date: 2018-05-18
RIZHAO FEM NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are many kinds of super retarders commonly used in the market, which have different effects on cement concrete, but most of them have the problem of reducing the later strength of concrete, which greatly increases the construction cost. Concrete super retarder with a certain strengthening effect has great practical significance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A kind of super-retarder for concrete, which is made from the following raw materials in parts by weight: 8 parts of sodium polyacrylate, 14 parts of ethoxy diglycol ether, 7 parts of polyglutamic acid / oligochitosaccharide hydrogel, carbonic acid 4 parts of ammonium hydrogen, 10 parts of starch compound, 10 parts of sucrose, 25 parts of water.

[0025] Described, starch compound is prepared by following steps:

[0026] 1) Weigh raw materials by weight: 10 parts of tapioca starch, 35 parts of polyethylene glycol 200, 2 parts of hydrochloric acid, 12 parts of N,N-dimethylformamide, 2 parts of sulfamic acid;

[0027] 2) Add tapioca starch and polyethylene glycol 200 into the reaction kettle, stir evenly; then add hydrochloric acid, heat up to 70°C, react for 6 hours, filter to obtain hydrolyzed tapioca starch;

[0028] 3) Add N,N-dimethylformamide and sulfamic acid to the reaction kettle, stir evenly; then add hydrolyzed tapioca starch, heat up to 90°C, react for 1h, cool...

Embodiment 2

[0033] A kind of super-retarder for concrete, is made by the raw material of following parts by weight: 5 parts of sodium polyacrylate, 16 parts of ethoxy diglycol ether, 5 parts of polyglutamic acid / chitooligosaccharide hydrogel, carbonic acid 3 parts of ammonium hydrogen, 12 parts of starch compound, 8 parts of sucrose, 30 parts of water.

[0034] Preferably, a concrete super retarder is made from the following raw materials in parts by weight: 8 parts of sodium polyacrylate, 14 parts of ethoxy diglycol ether, 7 parts of polyglutamic acid / oligochitosaccharide hydrogel parts, 4 parts of ammonium bicarbonate, 10 parts of starch compound, 10 parts of sucrose, and 25 parts of water.

[0035] Described, starch compound is prepared by following steps:

[0036] 1) Weigh raw materials by weight: 10 parts of tapioca starch, 35 parts of polyethylene glycol 200, 2 parts of hydrochloric acid, 12 parts of N,N-dimethylformamide, 2 parts of sulfamic acid;

[0037] 2) Add tapioca starch a...

Embodiment 3

[0043] A kind of super-retarder for concrete, is made by the raw material of following parts by weight: 10 parts of sodium polyacrylate, 12 parts of ethoxy diglycol ether, 9 parts of polyglutamic acid / chitooligosaccharide hydrogel, carbonic acid Ammonium hydrogen 5 parts, starch compound 8 parts, sucrose 12 parts, water 20 parts.

[0044] Preferably, a concrete super retarder is made from the following raw materials in parts by weight: 8 parts of sodium polyacrylate, 14 parts of ethoxy diglycol ether, 7 parts of polyglutamic acid / oligochitosaccharide hydrogel parts, 4 parts of ammonium bicarbonate, 10 parts of starch compound, 10 parts of sucrose, and 25 parts of water.

[0045] Described, starch compound is prepared by following steps:

[0046] 1) Weigh raw materials by weight: 10 parts of tapioca starch, 35 parts of polyethylene glycol 200, 2 parts of hydrochloric acid, 12 parts of N,N-dimethylformamide, 2 parts of sulfamic acid;

[0047] 2) Add tapioca starch and polyethy...

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Abstract

The invention discloses a super retarder for concrete. The super retarder for concrete is characterized by being prepared from the following materials in parts by weight: 5 to 10 parts of sodium polyacrylate, 12 to 16 parts of diethyleneglycolmonoethylether, 5 to 9 parts of polyglutamic acid / chitosan oligosaccharide hydrogel, 3 to 5 parts of ammonium bicarbonate, 8 to 12 parts of starch compound,8 to 12 parts of saccharose and 20 to 30 parts of water. The retarding time of the super retarder for concrete disclosed by the invention is long, the initial setting time is longer than or equal to 24 hours, the occurrence of hydration temperature peak is delayed, the hydration heat of cement is decreased, and moreover, by dosage, the retarding effect can be controlled; the super retarder for concrete has a later enhancement effect on concrete strength, and can increase the 28-day compressive strength of concrete; and the super retarder for concrete is highly compatible with water reducing agent, and can remarkably improve the quality stability of concrete products.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to a super retarder for concrete. Background technique [0002] Concrete admixture is a commonly used reagent in the concrete preparation process. It not only has a small dosage, but also can improve the performance of concrete and meet the needs of reagents. At the same time, it can also save cement, reduce energy consumption and reduce pollutant emissions. Common admixtures are: early strength agent, water reducing agent, air-entraining agent, retarder, etc. Retarders can delay the hydration rate of cement, adjust the setting time of concrete, and improve the construction performance of concrete. There are many types of retarders, and sucrose, citric acid, sodium gluconate, and inorganic phosphate are commonly used at present. In the production of ready-mixed concrete, it is often necessary to add a certain amount of retarder to keep the fresh concrete plastic for a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/38C04B28/00C04B103/22
CPCC04B28/00C04B40/0039C04B2103/22C04B2201/50C04B24/26C04B24/023C04B24/14C04B24/10C04B24/38C04B22/10C04B18/08C04B14/02C04B14/06C04B2103/302
Inventor 肖维录
Owner RIZHAO FEM NEW MATERIAL TECH
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