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Method for preparing alkali-activated-carbonate/slag gel material

A technology of gelling materials and carbonate minerals, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., to achieve the effects of prolonging the gel time, high retarding efficiency, and strong adaptability

Inactive Publication Date: 2010-09-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Tests have proved that these technological measures cannot effectively prolong the gel time of alkali-activated carbonate-slag cementitious materials; and the use of admixtures such as malic acid, calcium hydroxide, phosphoric acid, sodium phosphate, and sodium carbonate can make alkali-activated The gel time of carbonate-slag gelling materials is shortened; sucrose has no obvious effect on the gelation time of carbonate-slag gelling materials stimulated by alkali; admixtures such as zinc nitrate, lead nitrate, calcium nitrate, and sodium chloride The use of sodium tetraborate can only slightly prolong the gel time of alkali-activated carbonate-slag cementitious material; although the use of sodium tetraborate can greatly prolong the gel time of alkali-activated carbonate-slag cementitious material, However, the amount of sodium tetraborate is too large, accounting for about 12% of the slag mass, and at the same time, the fluidity of the cementitious material is greatly reduced
The above-mentioned retarding method of alkali slag cement with alkali metal silicate as the alkali component is not suitable for alkali-activated carbonate-slag cementitious materials, because the amount of alkali components differs greatly between the two

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The realization process of the retarding method of the alkali-activated carbonate-slag cementitious material is:

[0019] In terms of parts by mass, at normal temperature, 10 parts of barium chloride was dissolved in 100 parts of water to prepare a retarder solution, and then 280 parts of water-quenched blast furnace slag powder were added to it and stirred evenly; then 360 parts of 1.4. Add 280 parts of marginal carbonate ore powder to an activator whose mass percentage concentration of sodium oxide and silicon oxide is 45%, and continue stirring evenly to obtain an alkali-activated carbonate-slag cementitious material.

[0020] The gelation time of the alkali-activated carbonate-slag gelling material is 6h54min. According to GB8077-2000 "Concrete Admixture Homogeneity Test Method", the fluidity of the slurry is used to characterize the fluidity of the slurry. The results of the fluidity of the alkali-activated carbonate-slag cementitious material changing with time ar...

Embodiment 2

[0022] The realization process of the retarding method of the alkali-activated carbonate-slag cementitious material is:

[0023] In terms of parts by mass, at room temperature, 4 parts of barium nitrate was dissolved in 100 parts of water to prepare a retarder solution, and then 200 parts of water-quenched blast furnace slag powder was added to it, and stirred evenly; then 220 parts of , sodium oxide and silicon oxide mass percent concentration sum of 51% of the activator, while adding 200 parts of marginal carbonate ore powder, continue to stir evenly, that is, the alkali-activated carbonate-slag cementitious material is obtained.

[0024] The gelation time of the alkali-activated carbonate-slag gelling material is 2h35min. According to GB8077-2000 "Concrete Admixture Homogeneity Test Method", the fluidity of the slurry is used to characterize the fluidity of the slurry. The results of the fluidity of the alkali-activated carbonate-slag cementitious material changing with tim...

Embodiment 3

[0026] The realization process of the retarding method of the alkali-activated carbonate-slag cementitious material is:

[0027] In terms of parts by mass, at normal temperature, 7 parts of barium chloride were dissolved in 100 parts of water to prepare a retarder solution, and then 200 parts of water-quenched blast furnace slag powder were added to it and stirred evenly; then 220 parts of 1.8. Add 200 parts of marginal carbonate ore powder to an activator whose mass percent concentration of sodium oxide and silicon oxide is 51%, and continue stirring evenly to obtain an alkali-activated carbonate-slag cementitious material.

[0028] The gel time of the alkali-activated carbonate-slag gelling material is 8h50min. According to GB8077-2000 "Concrete Admixture Homogeneity Test Method", the fluidity of the slurry is used to characterize the fluidity of the slurry. The results of the fluidity of the alkali-activated carbonate-slag cementitious material changing with time are as fol...

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Abstract

The invention provides a retardation method for alkali-activated-carbonate / slag gel material which comprises, at normal temperature, calculated by mass portions, dissolving 4-10 portions of barium chloride or barium nitrate into 100 portions of water, thus obtaining retarder solution, then charging 200-300 parts of slag powder, agitating homogeneously, charging in turn 220-3100 parts of exciting agent, 200-3800 parts of marginal carbonate powdered ore, agitating homogeneously, finally obtaining the end product.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a method for preparing an alkali-activated carbonate-slag cementitious material. [0002] Background technique [0003] Alkali-activated carbonate-slag cementitious material is a new type of green cementitious material obtained directly at room temperature by using natural marginal carbonate ore, blast furnace slag and sodium silicate solution. It is aimed at the insufficient density of the hardened body of the alkali-activated carbonate cementitious material and the low strength in the later stage. On the basis of the alkali-activated carbonate cementitious material, some by-products of the ironmaking industry—water A cementitious material developed by quenching blast furnace slag. The so-called marginal carbonate ore refers to the carbonate rock whose CaO mass percentage content is less than 45% and MgO mass percentage content is 6% to 20%, which is difficult to use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/12C04B14/26C04B18/14
CPCY02W30/91
Inventor 赵三银余其俊殷素红文梓芸郭文瑛黄家琪乔飞
Owner SOUTH CHINA UNIV OF TECH
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