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Preparation method of carbon dioxide premixed cement-based composite material

A technology of carbon dioxide and composite materials, applied in the field of building materials, can solve the problems of complex process flow, inability to achieve carbonization, etc., and achieve the effect of broad application market, reduction of cement consumption, and excellent pore distribution.

Pending Publication Date: 2021-12-21
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are three restrictive factors in its application: First, when it is applied in industrial production, it often requires a relatively complicated process flow, involving pretreatment and pre-curing in the early stage of carbonization curing, etc., requiring multiple transfers and treatments of the product
2. Restricted by the diffusion efficiency of carbon dioxide, the carbonization that can be achieved by the carbon dioxide curing method only stays on the surface of the component, and cannot achieve uniform carbonization
3. This kind of curing method can only be applied to the curing of prefabricated components, but 70% of the concrete consumption is on-site pouring

Method used

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  • Preparation method of carbon dioxide premixed cement-based composite material
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  • Preparation method of carbon dioxide premixed cement-based composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1. A preparation method of carbon dioxide ready-mixed cement-based composite material, the operation method is as follows figure 1 As shown, the specific implementation steps are as follows: Accurately weigh the material according to the water-cement ratio of 0.5, pre-mix the water and cement evenly, and then continuously feed the mixed gas with a carbon dioxide concentration of 20% into the closed mixer, and the injection time The time is 2min, the gas flow rate is 100L / min, and the stirring speed is 60-80r / min. After the aeration is completed, add 1% water by mass of cement to the mixing pot to make up for the lost fluidity. Put the stirred slurry in a 20×20×20mm steel mold, vibrate for 30s, seal it with a black plastic film, and release it after natural curing for 24 hours; put the test block into a room with a temperature of 20°C and a relative humidity of 95%. Cultivate in a standard curing box until 28 days old.

[0029] The cement is ordinary Portland ...

Embodiment 2

[0035] Example 2. A preparation method of carbon dioxide ready-mixed cement-based composite material, the operation method is as follows figure 1 As shown, the specific implementation steps are as follows: Accurately weigh the material according to the water-cement ratio of 0.4, pre-mix the water and cement evenly, and then continuously feed the mixed gas with a carbon dioxide concentration of 20% into the closed mixer, and the injection time The time is 2min, the gas flow rate is 100L / min, and the stirring speed is 60-80r / min. After the aeration is completed, add 1% water by mass of cement to the mixing pot to make up for the lost fluidity. Put the stirred slurry in a 20×20×20mm steel film, vibrate for 30s, seal it with a black plastic film, and release it after natural curing for 24 hours; put the test block into a room with a temperature of 20°C and a relative humidity of 95%. Cultivate in a standard curing box until 28 days old.

[0036] The cement is ordinary Portland ...

Embodiment 3

[0042] Example 3. A preparation method of carbon dioxide ready-mixed cement-based composite material, the operation method is as follows figure 1shown, including the following steps:

[0043] Step 1: Inject carbon dioxide-containing gas into the cement slurry being stirred in a closed state for 30s to 240s;

[0044] Step 2: When the fluidity of the cement paste is significantly reduced, add water of 1% to 3% of the cement mass to restore its original fluidity; the carbonation reaction of ready-mixed concrete will consume a certain amount of water, resulting in cement and concrete Reduced flow of material. This reduction can be compensated by secondary hydration in the later stage of stirring, and a certain amount of strength gain can be achieved. Through subsequent natural maintenance, the cement paste and concrete materials will continue to be hydrated until they can be put into use;

[0045] Step 3: After completing Step 2, add sand, stones and admixtures to the cement p...

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Abstract

The invention discloses a preparation method of a carbon dioxide premixed cement-based composite material. The method comprises the following steps: 1, introducing gas containing carbon dioxide into cement paste which is stirred in a closed state for 30-240 seconds; 2, when the fluidity of the cement paste is obviously reduced, water accounting for 1%-3% of the mass of the cement is added into the cement paste so as to restore the original fluidity of the cement paste. The method has the characteristics of improving the material strength, reducing the cement consumption, relieving the greenhouse effect and being high in economic benefit.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a preparation method of carbon dioxide ready-mixed cement-based composite material. Background technique [0002] With the continuous development of industrialization, more and more steel mills and manufacturing plants are being built. The mining and combustion of fossil energy, and the large amount of carbon dioxide contained in the exhaust gas emitted by factories are important sources of greenhouse effect. At present, carbon emission reduction is a major issue facing the world, and "carbon peaking" and "carbon neutrality" have been put on the agenda. For the cement and building materials industries, which have extremely alarming carbon emissions, a very effective solution is to absorb and fix carbon dioxide through building materials. [0003] The method of carbonization curing has been studied as early as the last century. It achieves the purpose of early strength...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B40/00C04B28/04C04B40/02
CPCC04B40/0028C04B28/04C04B40/0231C04B2201/50C04B22/10C04B14/02C04B14/06
Inventor 林忠财汪珉璐罗双
Owner HUNAN UNIV
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