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Method for preparing building material product by clinker-free steel slag gel material and multiple CO2 absorbing techniques

A technology of cementitious materials and building materials, applied in the field of building materials, can solve problems such as low early strength, low wearability, and poor stability, and achieve the effects of improving production efficiency, increasing strength, and improving greenness

Inactive Publication Date: 2017-02-22
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the chemical composition and mineral composition of steel slag fluctuate greatly, the hydration process is difficult to control, the early strength is low, the stability is poor, the wearability is not high, and the pretreatment of raw materials is difficult, so the general processing of improving the activity of concrete admixtures is adopted. The preparation process is far from meeting the requirements for the use of steel slag, which greatly limits the utilization of steel slag in the cement concrete industry, making steel slag one of the materials with the lowest utilization rate of solid slag in China

Method used

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  • Method for preparing building material product by clinker-free steel slag gel material and multiple CO2 absorbing techniques
  • Method for preparing building material product by clinker-free steel slag gel material and multiple CO2 absorbing techniques
  • Method for preparing building material product by clinker-free steel slag gel material and multiple CO2 absorbing techniques

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Select a company with a specific surface area of ​​300-400m 2 Converter steel slag powder between / kg, add appropriate amount of water (water-solid ratio is 0.15), stir for 240s by conventional stirring method, and use 5MPa pressure to form 2 groups (6 pieces in each group) of test blocks with a size of 40mm×40mm×20mm, One set was placed in a pressure vessel and injected with CO 2 gas that makes CO 2 The air pressure reaches 2bar, and carbonization curing is carried out. After 2 hours, the strength reaches 15.5MPa, and the carbon fixation amount reaches 12.9%. While the other group underwent standard curing, the strength was 0 after 2 hours, and the amount of carbon fixation was 0.

[0029] The XRD patterns of converter steel slag, carbonation curing 2h and standard curing 2h are as follows figure 1 shown. from figure 1 It can be seen that after two hours of carbonization curing, the Ca(OH) in the original steel slag 2 Diffraction peaks disappear, CaCO 3 The inte...

Embodiment 2

[0031] Select a company with a specific surface area of ​​300-400m 2 Converter steel slag powder between / kg, add appropriate amount of water (water-solid ratio is 0.1), in CO 2 Stir for carbonization in the atmosphere for 240s, then add water with 5% of the mass of steel slag and continue stirring for 120s in the air atmosphere. Formed into 6 test blocks of 40mm×40mm×20mm with 8MPa pressure. Put the group of samples in a pressure vessel, inject CO 2 gas that makes CO 2 The air pressure reaches 2bar and the temperature is 15-25°C for carbonization curing. After 2-8 hours, the maximum strength reaches 10.5MPa, and the maximum carbon fixation capacity reaches 15.2%.

[0032] The XRD patterns of converter steel slag and steel slag mixture samples after carbonization stirring are as follows figure 2 shown. from figure 2 It can be seen that after carbonization stirring, the Ca(OH) in the XRD pattern of steel slag 2 The diffraction peaks of CaCO are obviously weakened, and ...

Embodiment 3

[0034] Select a company with a specific surface area of ​​300-400m 2 / kg electric furnace steel slag powder, add appropriate amount of water (water-solid ratio is 0.1), in CO 2 Stir for carbonization in the atmosphere for 240s, then add water with 5% of the mass of steel slag and continue stirring for 120s in the air atmosphere. Form 6 test blocks of 40mm×40mm×20mm with 8MPa pressure, place the test blocks in a pressure vessel, and inject CO 2 gas that makes CO 2 The air pressure reaches 2bar, and the temperature is 15-25°C for carbonization curing. After 2-8 hours, the strength reaches 6.8MPa, and the carbon fixation capacity reaches 10.2%. Compared with converter steel slag, the amount of carbon fixation is lower.

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Abstract

The invention discloses a method for preparing a building material product by a clinker-free steel slag gel material and multiple CO2 absorbing techniques. The method comprises the following steps of using ground steel slag as the clinker-free gel material, and mixing with a proper amount of water; performing two steps of carbonizing mixing and conventional mixing, and compressing and forming a mixture; performing carbonizing curing and standard curing, so as to obtain a green building material product. The method has the advantages that by adopting the techniques, the steel slag is completely used as the gel material; compared with the single carbonizing, the content of solid carbon in a curing sample by the multiple carbonizing is increased by 18 to 20 percent; by performing multiple carbonizing and standard curing, the strength of the sample is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a method of using clinker-free steel slag cementitious material combined with multiple CO 2 Absorption technology is a method of preparing building material products. Background technique [0002] The extreme climate problem caused by greenhouse gas emissions is becoming more and more serious, and various technologies are being used in various fields to achieve the purpose of energy conservation and emission reduction, so as to reduce greenhouse gas emissions. Due to the large consumption of fossil energy in the field of building materials, CO emissions 2 more greenhouse gases. It is estimated that the CO in the cement industry 2 Emissions account for 5% of global carbon emissions. Therefore, in the field of building materials, apply low-carbon technology to reduce CO in this field 2 Emissions are imminent. [0003] Steel slag is one of the three main industrial wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/08
CPCC04B28/082C04B2201/50
Inventor 何真李振梁辰
Owner WUHAN UNIV
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