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A high-strength all-steel slag block with enhanced carbon dioxide curing effect and its preparation method

A carbon dioxide and high-strength technology, applied in the field of green building materials, can solve the problems of high cost, high resource consumption, and low strength, and achieve the effects of low cost, simplified process, and reduced carbon footprint of aggregates

Active Publication Date: 2022-03-15
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of high resource consumption, high cost and low strength in the preparation of ordinary blocks, the present invention provides a high-strength all-steel slag block with enhanced carbon dioxide curing effect and a preparation method thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A high-strength all-steel slag block with enhanced carbon dioxide curing effect and its preparation method in this embodiment specifically include the following steps:

[0017] Step 1, using finely ground converter steel slag powder as the raw material for preparing blocks, and the average particle size of the steel slag powder particles is 6 μm;

[0018] Step 2: Weigh the brick-making water with the mass ratio (water-solid ratio) of water:steel slag powder being 0.13, and fully stir the steel slag powder and water in step 1 to form a mixture of steel slag powder and water;

[0019] Step 3: Weigh an appropriate amount of the mixture in Step 2, and use a pressure of 15 MPa to form it to obtain a formed block; calculate the initial porosity of the block based on the mass, volume, and water-solid ratio of the formed block, which is 27.96 %;

[0020] Step 4: Carry out carbon dioxide curing directly on the block in step 3, set the curing temperature to 20°C, relative humidi...

Embodiment 2

[0023] A high-strength all-steel slag block with enhanced carbon dioxide curing effect and its preparation method in this embodiment specifically include the following steps:

[0024] Step 1, using finely ground converter steel slag powder as a raw material for preparing blocks, and the average particle size of the steel slag powder particles is 10 μm;

[0025] Step 2: Weigh the water for making bricks with the mass ratio (water-solid ratio) of water:steel slag powder being 0.12, and fully stir the steel slag powder and water in step 1 to form a mixture of steel slag powder and water;

[0026] Step 3: Take an appropriate amount of the mixture in Step 2, and use a pressure of 10 MPa to form it to obtain a formed block; calculate the initial porosity of the block based on the mass, volume, and water-solid ratio of the formed block, which is 30 %;

[0027] Step 4: Carry out carbon dioxide curing directly on the block in step 3, set the curing temperature to 20°C, relative humidi...

Embodiment 3

[0030] A high-strength all-steel slag block with enhanced carbon dioxide curing effect and its preparation method in this embodiment specifically include the following steps:

[0031] Step 1, using finely ground converter steel slag powder as a raw material for preparing blocks, and the average particle size of the steel slag powder particles is 15 μm;

[0032] Step 2: Weighing the brick-making water with a mass ratio of water:steel slag powder (water-solid ratio) of 0.15, fully stirring the steel slag powder and water in step 1 to form a mixture of steel slag powder and water;

[0033] Step 3: Take an appropriate amount of the mixture in Step 2, and use 8MPa pressure to form it to obtain a formed block; calculate the initial porosity of the block from the information such as the mass and volume of the formed block and the water-solid ratio, which is 32 %;

[0034] Step 4, directly carry out carbon dioxide curing on the block in step 3, set the curing temperature to 30°C, rel...

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Abstract

The invention discloses an all-steel slag block with enhanced carbon dioxide curing effect and a preparation method thereof. It includes the following contents: select finely ground converter steel slag powder as raw material; add water according to the mass ratio of water: steel slag powder (water-solid ratio) of 0.10 to 0.15; fully stir the steel slag powder and water; weigh an appropriate amount of mixture, use 5MPa‑ The pressure of 15MPa controls the size of the block and forms it; after forming, verify the initial porosity of the block to make it greater than or equal to 25%; then the block is directly cured with carbon dioxide at normal temperature and pressure for 8 to 12 hours, which can enhance the high effect of carbon dioxide curing Strength all-steel slag blocks. This kind of block uses finely ground steel slag powder as the only material, does not need to use traditional cementitious materials, and can sequester carbon dioxide. It is green, environmentally friendly, low in production cost, and high in strength. The preparation process is simple, and the carbon dioxide curing effect can be enhanced only by controlling the water-solid ratio and the molding pressure without carbonization pretreatment. It is an optimized method for the existing carbon dioxide curing block technology and is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of green building materials, and in particular relates to a high-strength all-steel slag block with enhanced carbon dioxide curing effect and a preparation method thereof. Background technique [0002] Carbon dioxide curing technology is a hot spot in scientific research and industrial application in recent years. Its main principle is to generate carbonate and partial hydration products through the reaction of carbon dioxide and active calcium magnesium minerals, so as to achieve the purpose of rapid hardening of building materials. Its curing efficiency is comparable to steam curing, and it can rapidly increase the strength of building materials in a short period of time, while achieving lower energy consumption and carbon dioxide mineral sequestration. [0003] In the process of block preparation, high water consumption may lead to the saturation of its pores. Therefore, during carbon dioxide curing, the gas diffus...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B40/02
CPCC04B28/00C04B2201/50C04B2201/20C04B2111/00017C04B18/142C04B40/0231
Inventor 林忠财姜义
Owner HUNAN UNIV