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Method for adjusting fluidity and setting time of chemically activated cementing material system

A cementitious material and chemically stimulated technology, applied in cement production, etc., can solve the problems of loss of mechanical strength, large dosage, poor fluidity retention of slurry or mixture, etc., and achieve low cost and small dosage of inorganic salts , easy-to-obtain effect

Active Publication Date: 2021-09-24
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some scholars have applied phosphate, borate, malic acid, sodium chloride, etc. to the chemically stimulated gelling material system, and found that they can delay hydration to a certain extent, but their dosage is large, and the slurry or mixed flow The dynamic retention is poor, and the mechanical strength has a large loss

Method used

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  • Method for adjusting fluidity and setting time of chemically activated cementing material system
  • Method for adjusting fluidity and setting time of chemically activated cementing material system
  • Method for adjusting fluidity and setting time of chemically activated cementing material system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Each raw material is weighed according to the following quality: granulated blast furnace slag powder 65%, water glass solution 35%, respectively 600g and 318g. KNO 3 and Ba(NO 3 ) 2 They are respectively 3% and 0.15% of the granulated blast furnace slag powder, that is, 18g and 0.9g respectively. The above-mentioned powder materials are sequentially added to a slurry mixer and mixed evenly, and then water glass solution is added. The mixer stirred at a speed of 140r / min for 120s, stopped for 15s, and then stirred at a speed of 285r / min for 120s to obtain an alkali slag cement slurry.

[0029] On the basis of the above-mentioned alkali slag cement slurry material ratio, add river sand with a maximum particle size of 4.75mm according to the mortar-sand ratio of 1:3, that is, the raw materials are 600g of granulated blast furnace slag powder, 318g of water glass solution, and KNO 3 18g, Ba(NO 3 ) 2 0.9g, sand 1800g, stir evenly to prepare alkali slag cement mortar. ...

Embodiment 2

[0031] Each raw material is weighed according to the following quality: granulated blast furnace slag powder 70%, water glass solution 30%, respectively 600g and 262g. KNO 3 and Ba(NO 3 ) 2 They are respectively 4% and 0.1% of the granulated blast furnace slag powder, that is, 24g and 0.6g respectively, and are stirred uniformly according to the stirring system in Example 1 to obtain the alkali slag cement slurry.

[0032] On the basis of the above-mentioned alkali slag cement slurry material ratio, 1800 g of river sand with a maximum particle size of 4.75 mm was added according to the mortar-sand ratio of 1:3, and stirred evenly to prepare alkali slag cement mortar.

Embodiment 3

[0034] Each raw material is weighed according to the following quality: granulated blast furnace slag powder 67.5%, water glass solution 32.5%, are respectively 600g and 289g. KCl and Ba(NO 3 ) 2 They are respectively 5% and 0.2% of granulated blast furnace slag powder, that is, 30g and 1.2g respectively. Stir according to the stirring system of Example 1 to obtain alkali slag cement slurry.

[0035] On the basis of the above-mentioned alkali slag cement slurry material ratio, 1800 g of river sand with a maximum particle size of 4.75 mm was added according to the mortar-sand ratio of 1:3, and stirred evenly to prepare alkali slag cement mortar.

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Abstract

The invention discloses a method for adjusting fluidity and setting time of a chemically activated cementing material system, which comprises the steps of compounding and doping inorganic salt consisting of negative hydrated ions in the using process of a chemically activated cementing material, wherein the inorganic salt consisting of the negative hydrated ions adopts the inorganic salt formed by ions with different hydration properties and different chemical radiuses. The inorganic salt composed of the negative hydrated ions comprises one of KCl, KBr and KNO3 and Ba (NO3) 2. The content of KCl, KBr or KNO3 is 3%-5% of the mass of the chemically activated cementing material precursor material, and the content of Ba (NO3) 2 is 0.1%-0.2% of the mass of the chemically activated cementing material precursor material. According to the invention, the initial fluidity and fluidity retentivity of the chemically activated cementing material slurry can be improved, and the setting time can be prolonged. Compared with a chemically activated cementing material without being doped with inorganic salt, the initial fluidity of the slurry is improved by 5.9%-20.6%, the high fluidity is kept in 30 min and 60 min, the initial setting time is prolonged by 171%-307%, the final setting time is prolonged by 124%-232%, and the influence on the mechanical property of the chemically activated cementing material is small.

Description

technical field [0001] The invention belongs to the field of civil engineering materials, and in particular relates to a method for adjusting the fluidity and setting time of a chemically activated gelling material system. Background technique [0002] Civil engineering construction has the greatest impact on the human natural environment, and it occupies the largest proportion of resources and energy. Chemically stimulated gelled materials are ecological building materials with excellent physical and mechanical properties. It has good environmental coordination from raw materials, production process to use process. However, the hydration, coagulation, and hardening speeds of the chemically excited cementitious materials excited by water glass are relatively fast, and they lose fluidity quickly, which is not conducive to the engineering application of chemically excited cementitious materials. The superplasticizers used in Portland cement systems to increase fluidity inclu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/153C04B12/00
CPCC04B7/1535C04B12/005Y02P40/10
Inventor 何娟胡婷婷宋学锋伍勇华余书亚
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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