Concrete additive capable of resisting microbiological corrosion of concrete

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...

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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 as a functional component, its type, There is still a lack of systematic research on the choice of dosage and the impact on other properties of concrete, and some metal compounds will cause great pollution to the environment and bring new loads to environmental management.