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High-carbon-absorption early-strength cementing material based on recycled concrete powder and biochar and application of high-carbon-absorption early-strength cementing material

A technology of recycled concrete and cementitious materials, which is applied in the field of building materials, can solve the problems of reduced initial porosity, limited carbonation degree of materials, and high initial porosity of products, so as to improve carbon absorption capacity and early strength, reduce Effect of primary energy consumption and promotion of efficient utilization

Active Publication Date: 2022-07-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As the molding pressure increases, the initial porosity of the product decreases, and the CO 2 Penetration is hindered, the carbonation degree of the material is limited, and the strength development is slow; the molding pressure is reduced, and the initial porosity of the product is high, although CO 2 The penetration depth increases, but the initial porosity of the product is relatively high and the strength is low

Method used

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  • High-carbon-absorption early-strength cementing material based on recycled concrete powder and biochar and application of high-carbon-absorption early-strength cementing material
  • High-carbon-absorption early-strength cementing material based on recycled concrete powder and biochar and application of high-carbon-absorption early-strength cementing material
  • High-carbon-absorption early-strength cementing material based on recycled concrete powder and biochar and application of high-carbon-absorption early-strength cementing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Weigh 87.8wt% recycled concrete powder and 12.2wt% sludge, mix and grind to a specific surface area of ​​250-350m 2 / kg, heat up to 850°C at a rate of 10°C / min, hold for 1 h; then heat up to 1250°C at a rate of 10°C / min, hold at a constant temperature for 3 hours; cool down to 525°C at a rate of 300°C / min, hold a constant temperature for 30 minutes, and then cool with the furnace to room temperature, and then ground to a specific surface area of ​​300-450m 2 / kg, to obtain γ-C 2 Carbon-absorbing cementitious material with S content of 56.7 wt%. The threshold of biochar volume dosage is V thre =7.47+2.01×2.0+0.13×172.42-0.0014×85.7×3.47 2 = 32.5%, the biochar used is straw charcoal, its average particle size is 172.42 μm, the porosity is 85.7%, and the average pore size is 3.47 μm, 1.1 times the V thre The carbon-absorbing cementitious material prepared by biochar and recycled concrete powder is mixed to form a high carbon-absorbing early-strength cementitious materi...

Embodiment 2

[0043] Weigh 88.1wt% recycled concrete powder and 11.9wt% clay brick powder, mix and grind to a specific surface area of ​​250-350m 2 / kg, heat up to 850°C at a rate of 10°C / min, hold for 1 h; then heat up to 1300°C at a rate of 10°C / min, and keep the temperature for 3 hours; cool down to 525°C at a rate of 300°C / min, keep the constant temperature for 30 minutes, and then cool with the furnace to room temperature, and then ground to a specific surface area of ​​300-450m 2 / kg, to obtain γ-C 2 Carbon-absorbing cementitious material with S content of 65.2 wt%. The threshold of biochar volume dosage is V thre =7.47+2.01×5.0+0.13×172.42-0.0014×85.7×3.47 2 = 38.5%, the biochar used is straw charcoal, its average particle size is 172.42 μm, the porosity is 85.7%, and the average pore size is 3.47 μm, 1.1 times the V thre The carbon-absorbing cementitious material prepared by biochar and recycled concrete powder is mixed to form a high carbon-absorbing early-strength cementitious...

Embodiment 3

[0046] Weigh 86.4wt% recycled concrete powder and 13.6wt% glass slag, mix and grind to a specific surface area of ​​250-350m 2 / kg, heat up to 900°C at a rate of 10°C / min, and hold for 0.5h; then heat up to 1350°C at a rate of 10°C / min, and keep the temperature for 2 hours; cool down to 525°C at a rate of 300°C / min, keep the temperature for 30 minutes, and then follow the furnace Cool to room temperature, then grind to a specific surface area of ​​300-450m 2 / kg, to obtain γ-C 2 Carbon-absorbing cementitious material with S content of 71.2 wt%. The threshold of biochar volume dosage is V thre =7.47+2.01×4.0+0.13×172.42-0.0014×85.7×3.47 2 = 36.5%, the biochar used is straw charcoal, its average particle size is 172.42 μm, the porosity is 85.7%, and the average pore size is 3.47 μm. thre The carbon-absorbing cementitious material prepared by biochar and recycled concrete powder is mixed to form a high carbon-absorbing early-strength cementitious material.

[0047] Mix 83.2w...

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Abstract

The invention provides a high-carbon-absorption early-strength cementing material based on recycled concrete powder and biochar and application of the high-carbon-absorption early-strength cementing material, and relates to the field of building material technologies and environmental protection. According to the invention, the recycled concrete powder and the siliceous adjusting component are taken as main raw materials, gamma-C2S is generated through directional induction by designing a sintering system, the CO2 diffusivity and the penetration depth are improved by doping porous charcoal particles, the carbon-absorbing cementing material with the CO2 absorption mass up to 15-20% is prepared, and aggregate can be cemented in the carbon-absorbing process to form a hardened body with the strength up to 50 MPa or above. The carbon-absorbing cementing material is prepared from wastes and biochar, so that the CO2 absorption capacity of a cement-based material can be improved, the early strength of a hardened body can be improved by utilizing carbonate reaction, and the carbon-absorbing cementing material has remarkable environmental and social benefits such as energy conservation and emission reduction, ecological environmental protection and the like.

Description

technical field [0001] The invention relates to the field of building material technology and environmental protection, in particular to a high carbon absorption early-strength cementitious material based on recycled concrete powder and biochar and its application. Background technique [0002] The carbon emissions of the construction industry account for about 40% of the carbon emissions generated by human activities, and are facing enormous pressure to reduce carbon emissions. Absorb CO using cement-based materials 2 , is to reduce carbon emissions in the building materials industry and achieve CO 2 important way of long-term storage. The calcium silicate minerals in Portland cement have high carbonation activity and can absorb a large amount of CO under carbonation curing conditions 2 However, the preparation of clinker needs to consume a large amount of high-grade limestone and coal resources, and the direct application of Portland cement to absorb carbon has a small ...

Claims

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Application Information

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IPC IPC(8): C04B7/24C04B28/00C04B40/02
CPCC04B7/246C04B7/24C04B28/00C04B40/0231C04B2201/52C04B14/02
Inventor 张同生王龙龙郭奕群韦江雄余其俊
Owner SOUTH CHINA UNIV OF TECH
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