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Alkali activated concrete and its preparation method

An alkali excitation and concrete technology, applied in the field of concrete, can solve problems such as occupying large land, environmental pollution, and affecting the economic benefits of extracting alumina from high-alumina fly ash, and achieve excellent work performance and strength performance, which is conducive to resource utilization , Excellent resistance to sulfate attack

Active Publication Date: 2018-11-02
BEIJING ZHONGYANYI ENG TECH DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if it cannot be effectively utilized, the stacking of silicon-calcium slag will not only occupy a large amount of land, but also cause pollution to the environment, thereby affecting the economic benefits of alumina production from high-alumina fly ash

Method used

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  • Alkali activated concrete and its preparation method
  • Alkali activated concrete and its preparation method
  • Alkali activated concrete and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The present embodiment provides a kind of preparation method of alkali activated concrete:

[0035] (1) Preparation of calcium-silicon slag micropowder: After drying the original calcium-silicon slag, grind it in a ball mill to 26.0% to 28.0% of the sieve of 80 μm, and prepare the calcium-silicon slag micropowder;

[0036] (2) Preparation of alkali-activated gelling material powder: use silicon-calcium slag micro-powder with a specific surface area of ​​400m 2 / kg of mineral powder, specific surface area 600m 2 / kg ultra-fine ore powder is used as a raw material, and the silicon-calcium slag micro-powder, ore powder, and ultra-fine ore powder are mixed evenly in a certain proportion to prepare alkali-activated gelling material powder;

[0037] (3) Preparation of alkali-activated concrete: Add alkali-activated cementitious material powder, coarse aggregate, fine aggregate, and water in proportion to the concrete mixer and stir evenly, then add liquid water glass of a ce...

Embodiment 2

[0039] Fixed silicon-calcium slag micropowder: mineral powder: the mass ratio of superfine mineral powder is 70:15:15, select water glass (Na 2 O nSiO 2 ) modulus of 2.40, repeat the method in Example 1 to prepare alkali-activated concrete. The mass ratios of alkali-activated gelling material powder, coarse aggregate, fine aggregate, water, and water glass are shown in Table 1.

[0040]Refer to GB / T 50080-2002 "Standard for Test Methods of Performance of Ordinary Concrete Mixtures" to conduct the slump performance test of the prepared alkali-activated concrete. The test results are shown in Table 2.

[0041] According to GB / T 50081-2002 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete", the compressive strength test of the prepared alkali-activated concrete samples was carried out. The test results are shown in Table 2.

[0042] Referring to GB / T 50082-2009 "Standard for Test Methods of Long-term Performance and Durability of Ordinary Concrete", the...

Embodiment 3

[0045] Fixed silicon-calcium slag micropowder: mineral powder: the mass ratio of superfine mineral powder is 70:15:15, select water glass (Na 2 O nSiO 2 ) modulus of 2.40, repeat Example 2 to carry out the alkali-stimulated concrete preparation, slump test, compressive strength test, freeze-thaw cycle performance test and sulfate erosion resistance test of this embodiment. The mass ratios of alkali-activated gelling material powder, coarse aggregate, fine aggregate, water, and water glass are shown in Table 1. The results of slump performance and compressive strength performance are shown in Table 2. The results of freeze-thaw cycle performance are shown in Table 3. The results of sulfate attack resistance are shown in Table 4.

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Abstract

The invention relates to alkali-activated concrete and a preparation method thereof. The alkali-activated concrete comprises components in percentage by mass as follows: 12.5%-20.8% of alkali-activated cementing material powder, 2.1%-3.5% of Na2O*nSiO2 (n is 2.00-3.00), 6.3%-10.4% of water, 35.9%-43.5% of coarse aggregate and 29.4%-35.6% of fine aggregate, wherein the alkali-activated cementing material powder comprises silicon-calcium slag micro-powder, mineral powder and superfine mineral powder. The preparation method of the alkali-activated concrete comprises steps of preparation of the silicon-calcium slag micro-powder, preparation of the alkali-activated cementing material powder, mixing of the alkali-activated cementing material powder, the aggregate and the water, addition of Na2O*nSiO2, stirring and the like. The alkali-activated concrete is prepared from novel silicon-calcium slag as a raw material, so that the alkali-activated concrete has higher freezing and thawing cycle resistance and sulfate corrosion resistance and can be applied to buildings in freezing and thawing environments and offshore or marine environments, and resource recycling is facilitated because of adoption of the silicon-calcium slag as the main raw material.

Description

technical field [0001] The invention relates to a concrete, in particular to an alkali-activated concrete with silicon-calcium slag as a raw material and a preparation method thereof. Background technique [0002] my country's Shanxi, Inner Mongolia and other regions produce high-aluminum fly ash, and its aluminum content is as high as 40% to 60%. In order to make full use of this kind of aluminum ore resources, limestone sintering method is mostly used in China to extract aluminum. Calcium silicate slag is the residue after extracting alumina from high-alumina fly ash, which is rich in silicon and calcium components, and the main mineral component is dicalcium silicate. Since some alkali solution will remain during the aluminum extraction process, the silicon-calcium slag usually contains 3% to 8% alkali. This has brought great inconvenience for the recycling of silicon-calcium slag. According to the data, when limestone sintering is used to produce alumina, about 2.5 to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B12/00
CPCC04B12/005C04B28/006C04B14/04C04B14/06
Inventor 史迪张文生叶家元李巨才吴涛
Owner BEIJING ZHONGYANYI ENG TECH DEV CENT
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