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Method for preparing building material products through hydration-carbonation coupling technique

A technology of building materials and combined technology, applied in the field of building materials, can solve problems such as limitations, and achieve the effect of excellent product performance and low cost

Inactive Publication Date: 2014-05-07
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Patent CN200710014697.8 proposes carbonation of waste calcium-containing solids to prepare building materials, but limits the application of carbonation of fly ash, coal gangue and other calcium-less materials

Method used

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  • Method for preparing building material products through hydration-carbonation coupling technique
  • Method for preparing building material products through hydration-carbonation coupling technique

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Select calcium carbide slag discharged by a company in Shandong and fly ash from a company in Dalian to mix at a ratio of 1:2, add an appropriate amount of water (water-solid ratio 0.25), and make a 240mm×120mm×55mm brick, and resist compression after 2 days of hydration curing The strength reaches 6.8MPa, at a concentration of 25% CO 2 After 12 hours of carbonation and curing in the gas, the weight gain rate reaches 15.2%, and the compressive strength of the hydration-carbonation brick reaches 17.6MPa.

[0032] figure 1 It is calcium carbide slag, the XRD pattern of fly ash after hydration for 3 days and carbonization for 12 hours. It can be seen from the pattern that after hydration for 3 days, in addition to remaining a large amount of calcium hydroxide, C-S-H is also formed. After carbonization for 12 hours, the X-ray diffraction peak of calcium hydroxide disappeared, the X-ray diffraction peak of C-S-H weakened, and the content of calcium carbonate increased obvio...

Embodiment 2

[0035] The calcium carbide slag discharged from a company in Shandong and the slag from a company in Dalian were mixed at a ratio of 1:2, and an appropriate amount of water (water-solid ratio 0.20) was added to make bricks of 240mm×120mm×55mm. After 3 days of hydration curing, the compressive strength reached 6.2MPa, at a concentration of 50% CO 2 After carbonation and curing in gas for 12 hours, the weight gain rate reached 18.2%, and the compressive strength of the hydration-carbonation brick reached 25.6MPa.

Embodiment 3

[0037] Select calcium carbide slag discharged from a company in Shandong and steel slag from a company in Dalian to mix at a ratio of 1:3, add an appropriate amount of water (water-solid ratio 0.20), and make bricks with a size of 240mm×120mm×55mm. After 3 days of hydration curing, the compressive strength reaches 8.6MPa, at a concentration of 25% CO 2 After 12 hours of carbonation and curing in the gas, the weight gain rate reaches 20.3%, and the compressive strength of the hydration-carbonation brick reaches 32.5MPa.

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Abstract

The invention belongs to the technical field of building materials, and provides a method for preparing building material products through processing industrial solid waste by hydration-carbonation coupling technique. The method comprises steps of uniformly mixing the industrial waste comprising at least one of calcium oxide, calcium hydroxide, dicalcium silicate, tricalcium silicate and tobermorite with alkaline excitation material and proper amount of water so as to prepare the blank of the building material product, wherein the industrial waste comprises steel slag, mineral waste residue, furnace slag, coal ash or coal gangue, the alkaline excitation material comprises carbide slag, lime, Portland cement or waste cement; maintaining for a period through hydration, then maintaining through carbonation so as to obtain the carbonate-based building material product. The coupling technique can effectively use the industrial solid wastes such as steel slag, mineral waste residue, furnace slag, coal ash, coal gangue, carbide slag and the like, so that emission of greenhouse gases is reduced, the greenhouse effect is relieved, furthermore, the method can be used for producing the building material products with good properties, effectively uses the waste and is environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a method for preparing building material products through a combined hydration-carbonation technology. Background technique [0002] Modern industrial society burns fossil fuels such as coal, oil and natural gas excessively, and emits a large amount of CO 2 gas. Atmospheric CO by May 2013 2 The concentration has exceeded 400ppm. If no effective emission reduction measures are taken, the CO in the air will 2 The content of CO2 in the air will be 40-110% higher than that in 2000. By 2100, CO in the air will 2 The content of carbon dioxide will reach 540-970ppm, and cause the global average temperature to rise by 1.8-4°C, causing sea level rise, glaciers retreat, permafrost melting and other problems. This will cause serious harm to climate and environment, human health, ecological balance and even biodiversity. And with the increasing development of indu...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B40/00
Inventor 常钧房延凤李勇余鑫尚小朋曹明莉
Owner DALIAN UNIV OF TECH
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