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Liquid alkali-free accelerator and preparation method

An accelerator and liquid technology, applied in the field of building materials, can solve the problems of low 28d strength retention rate, insufficient comprehensive performance of the accelerator, and poor stability, and achieve solution stability and adaptability. Chlorine-free, fluorine-free, solution Good stability and adaptability, small loss of later strength

Active Publication Date: 2019-05-21
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For the deficiencies in the prior art, the object of the present invention is to provide a liquid alkali-free quick-setting agent and a preparation method to overcome the technical problem that the comprehensive performance of the existing quick-setting agent is not good enough
The overall performance of the accelerator is not good enough in the aspects of large dosage, high alkali content, large shrinkage, poor stability, low 28d strength retention rate, poor durability and large rebound volume, etc.

Method used

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  • Liquid alkali-free accelerator and preparation method

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Embodiment 1

[0032] According to the above-mentioned technical scheme, the present embodiment provides a liquid alkali-free quick-setting agent, which is characterized in that, in parts by mass, it is made of the following raw materials: the mother liquor is 35%, the modifier is 20%, and the active agent is 2%, the balance is water, and the sum of the parts by weight of raw materials is 100%;

[0033] in:

[0034] The mother liquor is mixed with β-chitosan and polyaluminum iron silicate in a mass ratio of 1:1, and water is added to make a mother liquor with a mass concentration of 45%;

[0035] Modifier, in parts by mass, consists of calcium sulfoaluminate micropowder: dibutyl phthalate: polydimethyl diallyl ammonium chloride: carrot antifreeze protein: diatom powder according to 10: ( 1~2): (1~2): (3~5): (5~6) ratio made;

[0036] The molecular formula of polydimethyldiallylammonium chloride is (C 8 h 16 NCl) n , The number average molecular weight is 500,000.

[0037] The active ag...

Embodiment 2

[0048] According to the above-mentioned technical scheme, the present embodiment provides a liquid alkali-free quick-setting agent, which is characterized in that, in parts by mass, it is made of the following raw materials: 40% of the mother liquor, 25% of the modifying agent, and activating agent of 3%, the balance is water, and the sum of the parts by weight of raw materials is 100%;

[0049] In this embodiment, the mother liquor, modifier and active agent are all the same as in Embodiment 1.

[0050] The preparation method of the liquid alkali-free quick-setting agent of this embodiment is basically the same as that of Embodiment 1.

Embodiment 3

[0052] According to the above-mentioned technical scheme, the present embodiment provides a liquid alkali-free quick-setting agent, which is characterized in that, in parts by mass, it is made of the following raw materials: 45% of the mother liquor, 20% of the modifying agent, and activating agent of 5%, the remainder is water, and the sum of the parts by weight of raw materials is 100%;

[0053] In this embodiment, the mother liquor, modifier and active agent are all the same as in Embodiment 1.

[0054] The preparation method of the liquid alkali-free quick-setting agent of this embodiment is basically the same as that of Embodiment 1.

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Abstract

The invention provides a liquid alkali-free accelerator and a preparation method. The liquid alkali-free accelerator comprises mother liquor, a modifier, an activator and water, totaling 100% by weight. The mother liquor 45% by mass mother liquor which is prepared by mixing beta-chitosan and polystlicate aluminum ferric in a mass ratio of 1: 1 and adding water. The modifier is prepared by proportioning calcium sulphoaluminate micropowder, dibutyl phthalate, polydiallyldimethylammonium chloride, carrot antifreeze protein and diatom powder in a mass ratio of 10: (1-2): (1-2): (3-5): (5-6). The activator is prepared by proportioning hydroxyethyl cellulose and 1,2-epoxy octodecane in a mass ratio of 1: 1. The accelerator is simple to prepare, low in alkali content, high in early strength of concrete, small in loss of later strength, good in solution stability and adaptability and chlorine and fluorine free, is a green and pollution-free product, and has an excellent effect in large temperature difference areas particularly.

Description

technical field [0001] The invention belongs to the field of building materials and relates to an accelerator, in particular to a liquid alkali-free accelerator and a preparation method. Background technique [0002] In recent years, the scale of my country's infrastructure construction is unprecedented, especially the rapid development of expressways and railways. In order to avoid tunnel collapse during tunnel construction, the surrounding rock needs to be reinforced, so shotcrete, which plays the role of retaining reinforcement, is often used in tunnel construction. With the increasing proportion of wet shotcrete in tunnel construction, the demand for high-quality liquid accelerators is also increasing. In order to improve the construction quality, it is necessary to explain the main problems in the current accelerator. [0003] The existing quick-setting agent mainly has the following problems: (1) the dosage is large. At present, the main material for preparing accel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/38C04B103/12
Inventor 何锐黄庆庆李栋薛成陈华鑫刘光军周恒玉
Owner CHANGAN UNIV
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