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Preparation method of solid waste-based cementing material early strength auxiliary agent

A technology of strong auxiliary agent and base glue, which is applied in the field of preparing early strength auxiliary agent for solid waste-based cementitious materials, can solve the problems of poor activity of steel slag and low early strength of cementitious materials, etc., so as to improve the early strength and the later stage. the effect of strength

Inactive Publication Date: 2021-08-03
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor activity of steel slag, the prepared cementitious material has low early strength, which affects the application.

Method used

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  • Preparation method of solid waste-based cementing material early strength auxiliary agent

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Calcining desulfurized gypsum at 700°C for 1 hour to obtain anhydrous desulfurized gypsum;

[0025] 2) Anhydrous desulfurized gypsum accounts for 30% of the weight of mixed desulfurized gypsum;

[0026] 3) Mix 85% slag, 5% waste incineration fly ash, 7% mixed desulfurized gypsum, 5% calcium aluminate cement, 3% refining slag and 35% water, place at room temperature for 48 hours, and then react at 70-80°C for 24 hours, Dried and ground to make early strength additives;

[0027] 4) Replace 1% of the steel slag in the control example with 1% of the early-strength additive to make a cement mortar test piece, and carry out the strength test after curing to the age.

Embodiment 2

[0029] 1) Calcining desulfurized gypsum at 600°C for 1 hour to obtain anhydrous desulfurized gypsum;

[0030] 2) Anhydrous desulfurized gypsum accounts for 45% of the weight of mixed desulfurized gypsum;

[0031] 3) Mix 90% slag, 2% waste incineration fly ash, 6% mixed desulfurized gypsum, 2% calcium aluminate cement, 2% refining slag and 35% water, place it at room temperature for 48 hours, and then react at 70-80°C for 24 hours, Dried and ground to make early strength additives;

[0032] 4) Replace 2% steel slag in the control example with 2% early strength additives to make cement mortar specimens, and perform strength tests after curing to age.

Embodiment 3

[0034] 1) Calcining desulfurized gypsum at 650°C for 1 hour to obtain anhydrous desulfurized gypsum;

[0035] 2) Anhydrous desulfurized gypsum accounts for 30% to 70% of the weight of mixed desulfurized gypsum;

[0036] 3) Mix 82% slag, 4% waste incineration fly ash, 10% mixed desulfurized gypsum, 3% calcium aluminate cement, 5% refining slag and 35% water, place it at room temperature for 48 hours, and then react at 70-80°C for 24 hours, Dried and ground to make early strength additives;

[0037] 4) Replace 3% of the steel slag in the control example with 3% early-strength additives to make cement mortar specimens, and perform strength tests after curing to age.

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Abstract

The invention provides a method for preparing a cementing material early strength auxiliary agent by using industrial waste residues, the method specifically comprises the following steps: calcining desulfurized gypsum at 600-700 DEG C to obtain anhydrous desulfurized gypsum, and mixing the anhydrous desulfurized gypsum with dihydrate desulfurized gypsum to obtain mixed desulfurized gypsum; mixing materials such as slag, waste incineration fly ash, refining slag, mixed desulfurized gypsum, calcium aluminate cement and water, heating to react, drying, and grinding to obtain the early strength auxiliary agent. The early strength auxiliary agent can improve the early strength of the solid waste-based cementing material, has the characteristics of low cost, environmental protection and the like, and a new way is developed for synergistic utilization and synergism of industrial waste residues.

Description

technical field [0001] The invention relates to a method for preparing an early-strength additive for solid waste-based cementitious materials by using steel slag as a main raw material. Background technique [0002] Iron and steel slag is a by-product produced in the process of steel production. my country, as a big steel country, produces a large amount of waste slag every year, which not only occupies land, pollutes the environment, but also causes waste of resources. Therefore, improving the utilization rate of steel slag not only solves environmental problems but also Realized the maximum utilization of resources. [0003] Iron and steel slag is rich in minerals such as dicalcium silicate and tricalcium silicate. It has certain gelling properties and can be used to produce cementitious materials. It also has the advantages of low-carbon environmental protection and waste recycling. Concrete materials have shown great potential in replacing cement in many fields. Howeve...

Claims

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Application Information

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IPC IPC(8): C04B22/14C04B103/14
CPCC04B40/0046C04B2103/14
Inventor 张玉婷赵风清郑琪潘仕文李配欣胡倩倩陈兰菊张志国范小响
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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