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Method for improving strength of calcium hydroxide carbonized hardened body and product

A calcium hydroxide and calcium hydroxide technology, applied in methods and products to improve the strength of calcium hydroxide carbonized hardened body, can solve the problems of low carbonized hardened body strength, poor cementation of calcium carbonate grains, etc. Effect

Active Publication Date: 2021-10-22
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, it is necessary to provide a method and product for improving the strength of calcium hydroxide carbide hardened body, in order to solve the problem that calcium hydroxide releases a large amount of water during the accelerated carbonization process in the prior art, resulting in the formation of intergranular cementation of calcium carbonate The technical problems of poor performance and low strength of carbon hardened body

Method used

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  • Method for improving strength of calcium hydroxide carbonized hardened body and product
  • Method for improving strength of calcium hydroxide carbonized hardened body and product
  • Method for improving strength of calcium hydroxide carbonized hardened body and product

Examples

Experimental program
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Effect test

Embodiment 1

[0033] After mixing 100 parts of calcium hydroxide, 20 parts of ordinary portland cement, 20 parts of magnesium hydroxide and 15 parts of water evenly, add 50 parts of pottery sand, continue to mix evenly, form under 15MPa pressure, and carbonize in the carbonization reactor. The carbonization conditions are as follows: the carbonization curing temperature is 25°C, the relative humidity is 50%, the carbon dioxide concentration is 99.8%, the air pressure is 0.1MPa, the carbonization time is 8h, and after carbonization curing, it is naturally cured at 20°C to the specified age.

[0034] The obtained calcium hydroxide carbide hardening body 1d compressive strength of embodiment 1 is 60MPa, and the 7d compressive strength is 75MPa.

Embodiment 2

[0036] After mixing 100 parts of calcium hydroxide, 20 parts of ordinary portland cement, 20 parts of magnesium hydroxide and 10 parts of water, add 50 parts of pottery sand, continue to mix evenly, form under 15MPa pressure, and carbonize in the carbonization reactor. The carbonization conditions are carbonization curing temperature of 25°C, relative humidity of 50%, carbon dioxide concentration of 99.8%, air pressure of 0.1MPa, carbonization time of 8 hours, and natural curing at 20°C to the specified age after carbonization curing.

[0037] The obtained calcium hydroxide carbide hardening body 1d compressive strength of embodiment 2 is 49MPa, and the 7d compressive strength is 62MPa.

Embodiment 3

[0039] After mixing 100 parts of calcium hydroxide, 20 parts of ordinary portland cement, 20 parts of magnesium hydroxide and 20 parts of water evenly, add 50 parts of pottery sand, continue to mix evenly, form under 15MPa pressure, and carbonize in the carbonization reactor. The carbonization conditions are carbonization curing temperature of 25°C, relative humidity of 50%, carbon dioxide concentration of 99.8%, air pressure of 0.1MPa, carbonization time of 8 hours, and natural curing at 20°C to the specified age after carbonization curing.

[0040] The obtained calcium hydroxide carbide hardening body 1d compressive strength of embodiment 3 is 53MPa, and the 7d compressive strength is 69MPa.

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Abstract

The invention relates to a method for improving the strength of a calcium hydroxide carbonized hardened body and a product. The method for improving the strength of the calcium hydroxide carbonized hardened body comprises the following steps: uniformly mixing a calcium hydroxide raw material, ordinary Portland cement, magnesium hydroxide, pottery sand and water according to a mass ratio of 100: (15-20): (15-20): (40-80): (10-20), and carrying out compression molding, carbonization curing and natural curing to obtain the product. Through the synergistic effect of physical adsorption and chemical reaction, moisture generated by carbonization of calcium hydroxide is consumed, and meanwhile, the carbonization degree and the gelling property of a reaction product are further improved through the C-S-H gelling effect generated by hydration of cement, the cementing effect of a carbonized product of magnesium hydroxide and the gas transmission channel and internal curing effect of pottery sand; therefore, the strength of calcium hydroxide carbonized and hardened body is greatly improved.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a method and product for improving the strength of a calcium hydroxide carbide hardened body. Background technique [0002] Calcium hydroxide has excellent carbonization reactivity and is the main component of many bulk industrial solid wastes, such as carbide slag and thiourea slag. Using the above solid waste and CO 2 While preparing bricks, blocks and other products through the carbonization reaction, it can effectively absorb and consolidate CO 2 , and realize the resource disposal of solid waste, which has a good application prospect. [0003] However, although calcium hydroxide has high carbonization reaction activity, a large amount of water will be released during the reaction process, resulting in the inability to form an effective overlapping network between the generated calcium carbonate grains, and the strength of the carbonized hardened body is low, thu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/10
CPCC04B28/10C04B2201/50C04B7/02C04B9/00C04B18/021C04B28/04C04B20/002C04B22/064C04B22/066C04B38/08C04B40/0071C04B40/0231C04B14/06C04B38/0058C04B38/0074C04B28/12
Inventor 刘志超王发洲胡曙光
Owner WUHAN UNIV OF TECH
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