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Accelerator for preparing low-carbon cementitious materials with carbonized steel slag cement and its application method

A cement preparation and accelerator technology, which is applied in the field of accelerators for carbonized steel slag-cement preparation of low-carbon cementitious materials, can solve the problems of affecting the effect of carbonization curing to prepare building materials, and the low strength of carbonization curing, so as to avoid the production process and reduce the strength. Improve and implement the effect of simple steps

Active Publication Date: 2019-11-08
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the performance of carbonized products is affected by its chemical composition and microstructure, etc., and the strength of carbonization curing is low, which affects the effect of carbonization curing to prepare building materials

Method used

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  • Accelerator for preparing low-carbon cementitious materials with carbonized steel slag cement and its application method
  • Accelerator for preparing low-carbon cementitious materials with carbonized steel slag cement and its application method
  • Accelerator for preparing low-carbon cementitious materials with carbonized steel slag cement and its application method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Weigh 70g of cement, 30g of steel slag, CaCO 3 3g, 28g of water, mix and stir evenly, put it into a mold of 20mm×20mm×20mm and vibrate to form, put it in a curing box with a temperature of 20°C and a humidity of 95% for 12 hours to remove the mold, and transfer it to a carbonization kettle for carbonization for 12 hours. For: temperature 90°C, CO 2 Pressure 3MPa. After carbonization, continue to put it into the curing box for curing until 3d and 28d, and test its mechanical properties with an electro-hydraulic servo anti-compression and bending machine.

Embodiment 2

[0037] Weigh 70g of cement, 30g of steel slag, Mg(OH) 23g, 28g of water, mixed and stirred evenly, put into a mold of 20mm×20mm×20mm and vibrate to form, the curing and carbonization method is the same as that of Example 1.

Embodiment 3

[0039] Weigh 70g of cement, 30g of steel slag, Na 2 CO 3 3g, 28g of water, mixed and stirred evenly, put into a mold of 20mm×20mm×20mm and vibrate to form, the curing and carbonization method is the same as that of Example 1.

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Abstract

The invention discloses an accelerator for preparation of a low-carbon cementitious material from carbonized steel slag and cement and belongs to the field of energy saving and emission reduction and ecological building materials. One, two or three of a mineral accelerator fly ash, CaCO3 seed crystals, basic accelerators Mg(OH)2 and Na2CO3 and an acid accelerator C2H2O4 are added to a steel slag and cement composite cementitious material, and the accelerator has a better acceleration effect. After the accelerator is added, activity of easily carbonized components in the steel slag and cement composite cementitious material is improved, the components are subjected to a reaction more easily with H2CO3 formed by dissolving CO2 in water vapor, and stable carbonate is formed. The acceleration effect of Mg(OH)2 and C2H2O4 is better, the strength of the carbonized steel slag and cement composite cementitious material is improved greatly, CO2 is consumed to a larger degree, and the low-carbon cementitious material with good performance is prepared.

Description

technical field [0001] The invention belongs to the field of energy saving and emission reduction and ecological building materials, and in particular relates to an accelerator for preparing low-carbon cementitious materials from carbonized steel slag-cement and an application method thereof. Background technique [0002] Steel slag is a kind of industrial solid waste discharged from steelmaking plants when producing steel. In 2014, my country's crude steel output was 820 million tons, and the steel slag output was 10% to 15% of the crude steel output, which was 0.82 to 120 million tons. At present, about 70% of steel slag is in stockpiling and landfill, and the utilization rate is far lower than that of developed countries. If these steel slags can be recycled, not only can a large amount of valuable metals be recovered, but also the environmental burden can be reduced. [0003] The study found that the mineral composition of steel slag is very similar to that of cement, b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/08C04B24/04C04B22/10C04B22/06C04B22/00C04B103/12
CPCC04B22/0006C04B22/066C04B22/10C04B24/04C04B28/082C04B40/0039C04B2103/12C04B2201/50
Inventor 吴其胜顾红霞诸华军黎水平张长森吴阳
Owner YANCHENG INST OF TECH
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