Concrete additive capable of resisting microbiological corrosion of concrete

A concrete admixture and microbial corrosion technology, applied in the field of concrete admixtures, can solve the problems of low net content and long-term retention rate of fungicides, environmental pollution of metal compounds, environmental management load, etc., to inhibit or reduce the generation of biological sulfuric acid , Efficient bio-corrosion effect, good dispersion effect

Active Publication Date: 2014-04-30
王桂长
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when used as a functional coating, the net content and long-term retention rate of the fungicide are low, and there are similar defects to the inert coating, which makes it difficult to ensure the long-term performance of concrete; and when it is mixed into concrete

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0031] Example 1

[0032] 1) Preparation of bactericidal additive: it is composed of cuprous oxide, nitrate and metal phthalocyanine compound, and its composition is cuprous oxide, sodium nitrate and metal iron phthalocyanine, the ratio is 1:1:1.

[0033] 2) After adding this kind of 0.3% of the total concrete bactericidal admixture to the concrete, conduct the corrosion test of the concrete sample

[0034] 3) Corrosion test of concrete sample

[0035] The corroded concrete specimen is a 28-day-old standard impermeable specimen with 0.3% admixture. The corrosion medium is immersed in a corrosive medium. The corrosive medium is artificially strengthened sewage with a large number of sulfate-corrosive bacteria produced by the laboratory.

[0036] During the test, the sample was first immersed in artificially enhanced sewage for 15h, and then dried for 6h. In this way, the total time of each dry and wet cycle is controlled at (24+2)h. After 20 wet and dry cycles, the compressive strength ...

Example Embodiment

[0037] Example 2

[0038] 1) Preparation of bactericidal additives: cuprous oxide, potassium nitrate and metal copper phthalocyanine compound, the ratio is 1:1:1.

[0039] 2) After adding this kind of 0.3% of the total concrete bactericidal admixture to the concrete, conduct the corrosion test of the concrete sample

[0040] 3) Corrosion test of concrete sample

[0041] The corroded concrete specimen is a 28-day-old standard impermeable specimen with 0.3% admixture. The corrosion medium is immersed in a corrosive medium. The corrosive medium is artificially strengthened sewage with a large number of sulfate-corrosive bacteria produced by the laboratory.

[0042] During the test, the sample was first immersed in artificially enhanced sewage for 15h, and then dried for 6h. In this way, the total time of each dry-wet cycle was controlled at (24+2)h. After 20 wet and dry cycles, the compressive strength of the concrete subjected to sulfate attack was measured, and then the compressive stre...

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PUM

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Abstract

The invention discloses a concrete additive capable of resisting microbiological corrosion of concrete. The concrete additive is composed of cuprous oxide, nitrate 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. When added into concrete, the additive has the advantages of a small doping amount, good dispersibility and capacity of effectively inhibiting or reducing generation of biological sulfuric acid for a long time and is a high-efficiency concrete additive capable of preventing a microbiological corrosion effect on the concrete.

Description

technical field [0001] The invention relates to the category of concrete admixtures, in particular to a concrete admixture resistant to concrete 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 [1], 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 pipe system in Hamburg alone due to microbial co...

Claims

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Application Information

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IPC IPC(8): C04B24/12C04B103/69
Inventor 任晨李思哲
Owner 王桂长
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