Preparation method for reinforced low-resilience and low-alkaline liquid concrete accelerator

A low-rebound, concrete technology, used in the preparation of reinforced, low-rebound, low-alkali liquid concrete quick-setting admixtures, and the field of cement concrete quick-setting admixtures, which can solve unfavorable hydration reactions, accelerate ettringite, reduce concentration and other problems, to achieve the effect of simple process, increased concrete strength and rapid response

Active Publication Date: 2016-07-20
JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reason for the coagulation-accelerating effect of organic alcohol amines on cement is to make C 3 Accelerated hydration of A, accelerated ettringite and high CaO / SiO 2 The formation of the C-S-H gel of the ratio accelerates the formation of diaspore and rapidly transforms to the cubic crystal form; at the same time, due to the formation of soluble complexes, the Ca in the cement paste is reduced. 2+ and Al 3+ Concentration, thus promoting the reaction of other cement minerals, but if the amount of organic alcohol amine is large, the cement particles are easy to adsorb together and coagulate, which is not conducive to the occurrence of hydration reaction and affects the later strength

Method used

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  • Preparation method for reinforced low-resilience and low-alkaline liquid concrete accelerator
  • Preparation method for reinforced low-resilience and low-alkaline liquid concrete accelerator
  • Preparation method for reinforced low-resilience and low-alkaline liquid concrete accelerator

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Embodiment 1

[0025] 1) The preparation method of modified alcohol amine organic small molecules: 1mol ethylenediamine and 4mol ethylene oxide are mixed at 25°C with 0.001molAlCl 3 Under the influence of the reaction for 1 hour, a small organic molecule with polyhydroxyl and polyamine groups is obtained, and then 2 mol of formic acid is added to react for 0.5 hour to obtain a modified alcohol amine organic molecule;

[0026] 2) Preparation of novel low-rebound, reinforced, and low-alkali liquid concrete quick-setting agent: 30% liquid modified sodium aluminate is added dropwise to 4.5% modified alkanolamine organic small molecules prepared in step 1). Add water at 30°C and stir for 1 hour, then add 0.3‰ polyacrylamide (relative molecular weight: 3 million) and stir for 5 minutes to prepare a new type of low-rebound, reinforced, and low-alkali liquid concrete accelerator.

Embodiment 2

[0028] 1) The preparation method of modified alkanolamine organic small molecules: 1mol p-phenylenediamine and 4mol propylene oxide were mixed at 30°C with 0.002molAlCl 3 After reacting for 1.5 hours under the action, a small organic molecule with polyhydroxy polyamine group was obtained, and then 2 mol of acetic acid was added to react for 0.5 hour to obtain a modified alcohol amine organic small molecule;

[0029] 2) Preparation of novel low-rebound, reinforced, and low-alkali liquid concrete quick-setting agent: 35% liquid modified sodium aluminate is added dropwise to 4% modified alcohol amine organic small molecules prepared in 1) step, at temperature Add water at 50°C and stir for 0.5 hours, then add 0.3‰ polyacrylamide (molecular weight: 5 million) and stir for 10 minutes to prepare a new type of low-rebound, reinforced, and low-alkali liquid concrete accelerator.

Embodiment 3

[0031] 1) The preparation method of modified alkanolamine organic small molecules: 1mol decanediamine and 4mol epichlorohydrin are mixed at 35°C with 0.003molFeCl 3 Under the action of reaction for 2 hours, a small organic molecule with polyhydroxy polyamine group was obtained, and then 2 mol of citric acid was added to react for 1 hour to obtain a modified alcohol amine organic small molecule;

[0032] 2) Preparation of novel low-rebound, reinforced, and low-alkali liquid concrete quick-setting agent: 49% liquid modified sodium aluminate is added dropwise to 3% modified alcoholamine organic small molecules prepared in 1) step, at temperature Add water at 30°C and stir for 1 hour, then add 0.2‰ polyacrylamide (molecular weight: 8 million) and stir for 15 minutes to prepare a new type of low-rebound, reinforced, and low-alkali liquid concrete accelerator.

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Abstract

The invention discloses a preparation method for a reinforced low-resilience and low-alkaline liquid concrete accelerator. The accelerator comprises material components with mass percentages as follows: 30-54% of liquid modified sodium aluminate, 0.8-5% of modified alcohol-amine organic micromolecules,0.1-0.3% of polyacrylamide and the balance of water; firstly, modified alcohol-amine organic micromolecules are prepared and then dropwise added into modified sodium aluminate solution, water is added under stirring, then polyacrylamide is added under stirring, and the reinforced low-resilience and low-alkaline liquid concrete accelerator is prepared. The method has the advantages that the preparation cost is low, the process is simple, and the prepared concrete accelerator has good stability suitable for concrete wet-spraying process and has the advantages of low admixture amount, low resilience ratio, short condensation time, low alkali content, good adaptability to cement, no adverse effect on concrete performance, and the like.

Description

technical field [0001] The invention relates to a quick-setting agent for cement concrete, which belongs to the technical field of building materials, and in particular to a preparation method of a low-rebound, reinforced and low-alkali liquid concrete quick-setting agent. Background technique [0002] Since my country began to promote the concrete wet spraying construction technology in the 1990s, for high-performance sprayed concrete that requires high strength and high durability, how to ensure the quality of sprayed concrete products and smooth spraying has always been an engineering construction task. one of the key issues. The development of a liquid accelerator with superior performance and good coagulation accelerating effect is the premise of popularizing the wet spraying process in our country. The currently developed liquid accelerators still have problems such as poor stability, high alkali content, large dosage, short stable period, 28d compressive strength rati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C04B103/12
CPCC04B40/0039C04B2103/12C04B24/122C04B22/0093C04B24/2652
Inventor 钱珊珊王幸福丁蓓王毅姜海东郑春扬郭兆来
Owner JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
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