A method for optimizing performance of calcium-based geopolymer by multi-component composite powder

A multi-component composite and optimization method technology, applied in cement production, etc., can solve the problems of alkali slag cement stone shrinkage and brittleness, durability impact, low cement stone strength, etc., to optimize the cement stone pore structure and reduce the total porosity , reduce the effect of refining the aperture

Inactive Publication Date: 2018-12-04
盐城桂友科技有限公司
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AI Technical Summary

Problems solved by technology

[0005] 1. Alkali slag cement prepared with a single slag component has high strength and good early strength, but its reaction products are mostly inorganic mineral oligomers, so its durability is affected to a certain extent
[0006] 2. The shrinkage and brittleness of alkali slag cement are relatively large, which limit the application of alkali slag cement
[0007] 3. Geopolymers prepared from materials such as metakaolin or fly ash, although the reaction product is an inorganic mineral polymer with good durability, but it requires a high curing temperature, and its cement stone strength at room temperature lower
[0008] 4. Geopolymers need to be in a strong alkaline environment before their strength can develop significantly, so that there is a hidden danger of damage caused by alkali-aggregate reaction; all of these greatly limit the application of geopolymers in engineering. large scale application

Method used

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  • A method for optimizing performance of calcium-based geopolymer by multi-component composite powder
  • A method for optimizing performance of calcium-based geopolymer by multi-component composite powder
  • A method for optimizing performance of calcium-based geopolymer by multi-component composite powder

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Experimental program
Comparison scheme
Effect test

Embodiment 2

[0047] Different forms of Na 2 SiO 3 Effect on compressive strength of slag slurry, solid Na 2 SiO 3 The modulus is 1, the high modulus liquid Na 2 SiO 3 Adjust its modulus to 1 with NaOH, Na 2 SiO 3 The dosages are 2%, 4%, 6%, 8%, and 10%, respectively, the granulated blast furnace slag is used as the cementitious material, the water-cement ratio is 0.45 for experiments, and the curing is carried out under standard conditions.

[0048] The preparation steps of the calcium-based polymer are the same as in Example 1.

[0049] The experimental results are shown in Table 3.

[0050] Table 3 Na in different forms 2 SiO 3 Influence on the compressive strength of slag slurry.

[0051]

[0052] It can be seen from Table 3 that the same modulus is 1, and the liquid Na 2 SiO 3 The excitation effect on slag powder is due to the solid Na 2 SiO 3 . Solid Na 2 SiO 3 In the case of a dosage of 2%-4%, there is no compressive strength for 3 days and 7 days, and very low co...

Embodiment 3

[0054] Liquid Na with different modulus 2 SiO 3 The impact on the compressive strength of the slag slurry, according to the calculated ratio, in the commercially available liquid Na 2 SiO 3 Add NaOH to make liquid Na with modulus 0.8, 1.0, 1.2, 1.4, 1.6 respectively 2 SiO 3 . Liquid Na 2 SiO 3 The dosage accounts for 6% of the mass ratio of the granulated blast furnace slag powder, the water-binder ratio is 0.45, and it is cured under standard conditions.

[0055] The experimental results are shown in Table 4.

[0056] Table 4 Liquid Na with different modulus 2 SiO 3 Influence on the compressive strength of slag slurry.

[0057]

[0058] At 6% dosage, the compressive strength of slag clean slurry varies with liquid Na 2 SiO 3 Modulus decreases and increases. At 3 days and 7 days, the compressive strength varies with liquid Na 2 SiO 3 The decrease in modulus increases steadily. However, the increase in the range of 0.8-1.0 is not large. On the 28th day, the ...

Embodiment 4

[0060] Liquid Na in different amounts 2 SiO 3 The impact on the compressive strength of the slag slurry, according to the calculated ratio, in the commercially available liquid Na 2 SiO 3 Add NaOH to prepare liquid Na with a modulus of 1.0 2 SiO 3 . Liquid Na 2 SiO 3 The dosage is 4%, 6% and 8% in the mass ratio of granulated blast furnace slag powder, the water-binder ratio is 0.45, and it is cured under standard conditions.

[0061] The experimental results are shown in Table 5

[0062] Table 5 Liquid Na in different dosages 2 SiO 3Effect on compressive strength of slag slurry

[0063]

[0064] It can be seen from Table 5 that with Na 2 SiO 3 With the increase of the dosage, the compressive strength of slag net slurry also increases; Na 2 SiO 3 After the dosage increases to a certain extent, the compressive strength of the slag clean slurry increases less; 2 SiO 3 In the case of different dosages, the compressive strength of slag clean slurry develops stea...

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Abstract

The invention discloses a method for optimizing performance of calcium-based geopolymer by multi-component composite powder. The method includes the following steps: an influence rule of NaOH on hardened slurry strength is analyzed by utilizing a single-component slag as a gelling material; the influence rule of Na2SiO3 with different forms on compressive strength of granulation blast furnace slagnet paste is analyzed, and Na2SiO3 in a liquid state is determined to be adopted as an exciting agent; through analyzing the rule of the Na2SiO3 with different moduli on the compressive strength of the granulation blast furnace slag net paste, the Na2SiO3 in the liquid state the modulus of which is 1 is determined to be adopted as the exciting agent; finally the influence rule of the Na2SiO3 in the liquid state with different mixing amounts on the compressive strength of granulation blast furnace slag net paste is analyzed; monomer activity of various gelling materials and the influence rulethereof on the hardened slurry strength are researched according to an obtained alkaline exciting agent experiment parameter; and 80% of slag powder, 10% of metakaolin and 10% of fly ash are selectedas the multi-component composite powder. The calcium-based geopolymer is prepared by the multi-component composite powder, an effect that a calcium-based geopolymer hydration product and a pore structure thereof are optimized is achieved, and the compressive strength of the prepared calcium-based geopolymer is higher.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a calcium base polymer prepared by multi-component compounding by using granulated blast furnace slag powder, metakaolin and fly ash and its performance optimization method. Background technique [0002] Since the invention of Portland cement in 1824, its large-scale application has promoted the great development of human society, but at the same time, it has also produced some urgent environmental problems, which seriously threaten the living environment of human beings. The traditional Portland cement adopts the "two grinding and one burning" process, which consumes a large amount of non-renewable energy such as oil, coal and natural gas, and its energy consumption accounts for about 15% of the world's total energy consumption; at the same time, it also emits a large amount of greenhouse gas CO 2 , causing the global average temperature to rise year by year, which ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/24C04B7/153
CPCC04B7/1535C04B7/243Y02P40/10
Inventor 吴卓谕
Owner 盐城桂友科技有限公司
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