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Self-repairing steel slag-slag concrete and preparation method thereof

A self-healing and concrete technology, applied in the field of building materials, can solve the problems of high price of solid sodium silicate, poor economy, and large specific gravity, and achieve the effects of avoiding concrete shrinkage, reducing environmental pollution, and improving activity.

Active Publication Date: 2021-03-16
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the silica fume and solid sodium silicate used in this method are expensive, have a large proportion, and are not economical.

Method used

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  • Self-repairing steel slag-slag concrete and preparation method thereof
  • Self-repairing steel slag-slag concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A preparation method of self-repairing steel slag-slag concrete, the steps are as follows:

[0035] 1) Take 20 parts by mass of steel slag, 10 parts by mass of water, and wet mill 0.2 parts by mass of polycarboxylate superplasticizer for 60 minutes to obtain slurry A. The median particle size of slurry A reaches 3 μm, and 80 parts by mass of slag, 40 parts by mass of water were wet milled for 60 minutes to obtain slurry B, and the median particle size of slurry B was 3 μm;

[0036] 2) Mix slurry A and slurry B obtained in step 1) to obtain slurry C, and stir for 15 seconds with a mortar mixer;

[0037] 3) Add 2 mass parts of prepared slow-release sodium silicate hydroxyapatite capsules, 2 mass parts of sodium phosphate hydroxyapatite capsules, 3 mass parts to the pre-stirred mixed slurry in step 2). Carbide slag dry powder, 5 parts by mass of Na 2 CO 3 , and then use a mortar mixer to stir slowly for 2 minutes and stir quickly for 2 minutes to obtain evenly stirred s...

Embodiment 2

[0039] A preparation method of self-repairing steel slag-slag concrete, the steps are as follows:

[0040]1) Take 20 parts by mass of steel slag, 10 parts by mass of water, and wet mill 0.2 parts by mass of water reducer for 60 minutes to obtain slurry A. The median particle size of slurry A reaches 2 μm, 80 parts by mass of slag, and 40 parts by mass Wet grinding with water for 60 minutes to obtain slurry B, the median particle size of slurry B is 4 μm;

[0041] 2) Mix slurry A and slurry B obtained in step 1) to obtain slurry C, and stir for 15 seconds with a mortar mixer;

[0042] 3) Add 3 parts by mass of prepared slow-release sodium silicate hydroxyapatite capsules, 3 parts by mass of sodium phosphate hydroxyapatite capsules, 3 parts by mass Parts of calcium carbide slag dry powder, 7 parts by mass of Na 2 CO 3 , and then use a mortar mixer to stir slowly for 2 minutes and stir quickly for 2 minutes to obtain evenly stirred self-repairing steel slag-slag concrete.

Embodiment 3

[0044] A preparation method of self-repairing steel slag-slag concrete, the steps are as follows:

[0045] 1) Take 30 parts by mass of steel slag, 15 parts by mass of water, and wet mill 0.2 parts by mass of water reducer for 60 minutes to obtain slurry A. The median particle size of slurry A reaches 2 μm, 70 parts by mass of slag, and 35 parts by mass Wet grinding with water for 60 minutes to obtain slurry B, the median particle size of slurry B is 3 μm;

[0046] 2) Mix slurry A and slurry B obtained in step 1) to obtain slurry C, and stir for 15 seconds with a mortar mixer;

[0047] 3) Add 2 mass parts of prepared slow-release sodium silicate hydroxyapatite capsules, 2 mass parts of sodium phosphate hydroxyapatite capsules, 3 mass parts to the pre-stirred mixed slurry in step 2). Parts of calcium carbide slag dry powder, 5 parts by mass of Na 2 CO 3 , and then use a mortar mixer to stir slowly for 2 minutes and stir quickly for 2 minutes to obtain evenly stirred self-repa...

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Abstract

The invention relates to the technical field of building materials, in particular to self-repairing steel slag and slag concrete and a preparation method thereof. The self-repairing steel slag and slag concrete is prepared from, by mass, 4-6 parts of porous hydroxyapatite capsules, 20-40 parts of steel slag, 0.1-0.2 part of water reducing agent, 60-80 parts of slag, 5-7 parts of sodium carbonate,3-5 parts of carbide slag dry powder and a proper amount of water. The steel slag and the slag are used as cementing materials to replace cement, so that the cost is reduced, the environmental pollution is reduced, and the strength grade of ordinary Portland cement 42.5 is reached; compared with strong base, carbide slag, sodium carbonate and other weak bases are added, cost reduction is facilitated, and environment pollution is avoided; meanwhile, the carbide slag can react with silicon dioxide and aluminum oxide in steel slag and mineral slag to generate hydrated calcium silicate and hydrated calcium aluminate; and due to the slow release effect of the porous hydroxyapatite capsule, material waste can be avoided, and the porous hydroxyapatite capsule is an intelligent repair material capable of being used for a long time.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a self-repairing steel slag-slag concrete and a preparation method thereof. Background technique [0002] In the current society, concrete has become the largest building material and structural material in the construction market. However, the concrete material is not only bulky and heavy, but also the biggest problem is that concrete is prone to cracks under the influence of different environments, loads and other adverse factors. Over time, the internal cracks will grow into cracks until they extend to the outer surface, and the concrete itself will undergo tensile deformation, exceeding the tensile strength of the concrete and eventually causing the concrete to crack. Concrete is easily corroded and damaged by the external environment and various harmful factors after forming through cracks, such as steel corrosion, concrete carbonation, decreased freeze-thaw resi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/08
CPCC04B28/082C04B2201/50C04B2201/52C04B22/16C04B18/141C04B18/0481C04B22/10C04B2103/302
Inventor 王迎斌杨杰贺行洋苏英肖虎成王文娜李欣懋熊光徐立刘文志李阳李齐
Owner HUBEI UNIV OF TECH
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