Preparation of composite high-expansion cementing material by using industrial slag and preparation technique thereof

A technology of industrial waste residue and cementitious material, applied in cement production and other directions, can solve the problems of environmental pollution, slow setting time, high production cost, etc., and achieve high economic and environmental benefits, high expansion hole filling capacity, high binding water effect of ability

Inactive Publication Date: 2008-05-21
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that Portland cement has relatively large defects in curing soft soil, especially when curing soft soil with high water content. For example, it cannot provide a sufficient alkalinity environment for the hydration and hardening of the solidified soil, and cannot produce A large amount of expansive hydrate fills the compact soil structure, and the free water in the soil cannot be consumed in a large amount into bound water, etc., resulting in the use of Portland cement curing agent, the amount is too large, the cost is high, and the reinforcement effect is not good.
Portland series cementitious materials also have certain problems in mining projects, underground cavity filling projects, grouting plugging and other projects, such as slow setting time and large dosage, resulting in high costs. also pollute the environment
Although there are cementitious materials that can set quickly in China, the production cost of this material is relatively high, and the cost is relatively high. It is extremely unsuitable to be used in these large-scale projects.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The specific components of the cementitious material of the present invention and the preparation process thereof are as follows: 50% of the fly ash of the first component, 30% of the lime of the second component, and 20% of the gypsum of the third component are mixed uniformly, and the Cured under steam conditions for 7 days, during which it was ground for 3 hours a day to increase the reaction rate, and then subjected to high-temperature calcination at 400°C, and then ground to a specific surface area of ​​200-500m 2 / kg to obtain component (i); respectively dry calcium carbide slag and phosphogypsum and grind until the specific surface area is 200-500m 2 / kg to obtain component (ii) and component (iii) respectively. Mix 60% of component (i), 20% of component (ii) and 20% of component (iii) evenly to obtain a composite high-expansion gel material.

Embodiment 2

[0014] Mix 30% slag or steel slag, 50% calcium carbide slag, and 20% gypsum evenly, and maintain it under steam at 80°C for 3 days, grinding for 1 hour a day to increase the reaction rate, and then calcining at 450°C , and then ground to a specific surface area of ​​300m 2 / kg to obtain component (i); dry lime and phosphogypsum respectively, and grind them until the specific surface area is 300m 2 / kg to obtain component (ii) and component (iii) respectively. Mix 70% of component (i), 10% of component (ii) and 20% of component (iii) evenly to obtain a composite high-expansion gel material.

Embodiment 3

[0016] Mix 40% of coal gangue, 50% of alkali slag, and 10% of gypsum evenly, and maintain it under steam conditions at 100°C for 5 days, during which it is ground for 1.5 hours a day to increase the reaction rate, and then undergoes high-temperature calcination at 550°C. Then grind to a specific surface area of ​​400m 2 / kg to obtain component (i); dry the slag or steel slag and grind it to a specific surface area of ​​400m 2 / kg to obtain component (ii); dry the phosphogypsum and grind it to a specific surface area of ​​400m 2 / kg to obtain component (iii). Mix 60% of component (i), 30% of component (ii) and 10% of component (iii) evenly to obtain a composite high-expansion gel material.

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PUM

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Abstract

The invention relates to a preparation process of using industrial slag to prepare composite cementing materials with high expansibility. The cementing materials consist of four components. The first component includes three parts: one or a plurality of combinations of fly ashes, slag, etc., which contain aluminosilicate; one or a plurality of combinations of phosphogysum, fluorine gypsum, etc., which contain calcium sulfate; one or a plurality of combinations of carbide, alkaline residue, quick lime or slaked lime. The second component includes: one or a plurality of combinations of alkaline composition, such as the quick lime or slaked lime, the carbide slag, etc.. The third component includes one or a plurality of combinations of the phosphogypsum, fluorine gypsum, etc., which contain the calcium sulfate. The preparation method is: firstly, to evenly mix the raw materials of the first component which are grinded to be with the surface area of 200-500m<2> / kg through the steam curing of four hours to ten days at 50-100 DEG C and the calcining of 0.5-24h at the high temperature of 400-1000 DEG C to obtain the first component; secondly, to dry and grind the raw materials of the second and the third component to be with the surface area of 200-500m<2> / kg to obtain the second and the third component; thirdly, to evenly mix the first, the second and the third component.

Description

(1) Technical field: [0001] The invention relates to a composite high-expansion gelling material prepared by using industrial waste residue and a preparation process, belonging to the technical field of inorganic non-metallic materials and environmental protection. (two) background technology: [0002] At present, there are a large number of projects at home and abroad that need gelling materials with high water-fixing capacity, high expansibility and certain gelling ability. Such as the soft soil solidification project of foundation treatment, soft soil is widely distributed in our country, the treatment of soft soil foundation is the key problem that must be solved first in civil engineering construction, and the soft soil solidification technology (such as deep mixing pile) is the most widely used , foundation reinforcement technology with high economic benefits, and the selection of solidified cementitious materials is an important factor affecting the technical and econ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/24C04B7/14C04B7/36
CPCY02P40/10
Inventor 黄新李战国牛晨亮
Owner BEIHANG UNIV
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