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Microbial corrosion-resistant concrete additive

A concrete admixture and anti-microbial technology, which is applied in the field of concrete admixtures, can solve the problems of shortened service life of concrete facilities, concrete surface fouling, economic losses, etc., achieve high-efficiency anti-microbial corrosion of concrete, and inhibit or reduce the effect of biological sulfuric acid Good effect of generation and dispersion

Inactive Publication Date: 2017-10-20
杨化飞
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Microbial corrosion leads to concrete surface staining, surface loosening, mortar falling off, aggregate exposure, cracking and steel bar corrosion in severe cases, shortening the service life of concrete facilities, and causing serious economic losses

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Preparation of bactericidal admixture: anhydrous copper sulfate, nitrite and metal phthalocyanine compound, the composition is anhydrous copper sulfate, sodium nitrate and metal iron phthalocyanine, the ratio is 1:1:1.

[0025] 2) After adding this 0.3% bactericidal admixture to the concrete, the corrosion test of the concrete sample was carried out

[0026] 3) Corrosion test of concrete samples

[0027] The corroded concrete specimen is a standard anti-seepage specimen with 0.3% admixture of 28 days old, which is soaked in a corrosive medium. The corrosive medium is artificially strengthened sewage with a large number of sulfate corrosion bacteria self-made in the laboratory.

[0028] During the test, the sample was first soaked in artificially enhanced sewage for 15 hours, and then dried for 6 hours. In this cycle test, the total time of each dry-wet cycle was controlled at (24+2)h. After 20 dry-wet cycles, measure the compressive strength of the concrete subjecte...

Embodiment 2

[0030] 1) Preparation of bactericidal admixture: composed of anhydrous copper sulfate, nitrite and metal copper phthalocyanine compound, the ratio is 1:1:1.

[0031] 2) After adding this 0.3% bactericidal admixture to the concrete, the corrosion test of the concrete sample was carried out

[0032] 3) Corrosion test of concrete samples

[0033] The corroded concrete specimen is a standard anti-seepage specimen with 0.3% admixture of 28 days old, which is soaked in a corrosive medium. The corrosive medium is artificially strengthened sewage with a large number of sulfate corrosion bacteria self-made in the laboratory.

[0034] During the test, the sample was first soaked in artificially enhanced sewage for 15 hours, and then dried for 6 hours. In this cycle test, the total time of each dry-wet cycle was controlled at (24+2)h. After 20 dry-wet cycles, measure the compressive strength of the concrete subjected to sulfate attack, and then calculate the compressive strength and cor...

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Abstract

The invention discloses a microbial corrosion-resistant concrete additive. The microbial corrosion-resistant concrete additive comprises anhydrous copper sulfate, nitrite and metal phthalocyanine (MPc) according to a weight ratio of (1-1.2):(1-1.2):(1-1.2), wherein M is Fe, Co, Ni, Cu or Zn. The additive has the advantages of small admixture, good dispersibility and effective and lasting inhibition or reduction of the generation of biological sulfuric acid when added to concrete, and is a high-efficiency concrete microbe corrosion-resistant concrete additive.

Description

technical field [0001] The invention relates to the category of concrete admixture, in particular to a concrete admixture resistant to microbial corrosion. Background technique [0002] There are many reasons for the corrosion of concrete. In addition to the corrosion of chemical media such as inorganic acids, alkalis, salts and organic acids, there is also microbial corrosion. This is a long-lasting corrosion phenomenon that is difficult to detect and seriously harmful. Microbial corrosion leads to concrete surface defacement, surface loosening, mortar shedding, aggregate exposure, and cracking and steel bar corrosion in severe cases, shortening the service life of concrete facilities and causing serious economic losses. According to statistics, the proportion of microbial corrosion in the destruction of concrete building materials in Germany is about 10% to 20%. In the 1970s, the maintenance cost of the sewage pipeline system in Hamburg alone due to microbial corrosion wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/40C04B103/67
CPCC04B40/0039C04B2103/67C04B22/142C04B22/085C04B24/40
Inventor 杨化飞
Owner 杨化飞
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