Additive for improving carbonization resistance of concrete as well as preparation method and application of additive

Abstract

The invention provides an additive for improving carbonization resistance of concrete as well as a preparation method and application of the additive, and belongs to the technical field of concrete. The additive provided by the invention is prepared from the following components in parts by mass: 8-12 parts of mineral substance fine powder, 3-5 parts of silica fume, 10-15 parts of metakaolin, 3-5 parts of methyl silicate, 2-3 parts of an expanding agent, 5-8 parts of a super plasticizer and 6-12 parts of a self-healing expanding fiber anti-crack waterproof agent. Results of the embodiment show that the additive provided by the invention can reduce the internal porosity of concrete by 50% or more, and reduce the number of capillary pores and macropores. The strength of the prepared concrete can be improved by 70% in 3 days, the strength of the prepared concrete can reach the original strength on the 28th day in 7 days, and the strength can be improved by about 20% in 28 days. Energy spectrum analysis before and after concrete carbonization shows that the carbon content of concrete is relatively low even if the concrete is carbonized, which indicates that the additive has very good carbonization resistance.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to an admixture for improving the anti-carbonation ability of concrete and a preparation method and application thereof. Background technique [0002] Mr. Tang Mingshu, an academician of the Chinese Academy of Engineering, once pointed out that improving the service life of existing building concrete is the biggest energy saving and emission reduction measure in the construction field. It can be seen that improving the durability of concrete has become an inevitable requirement for the development of concrete technology. During the long-term use of concrete buildings, it is inevitable that they will be in contact with the external environment, and they are easily eroded by various corrosive media in the atmosphere. 2 As an acid gas, the erosive effect on concrete easily leads to neutralization (carbonization) of concrete, which in turn leads to a series of problems such as corrosi...

AI Technical Summary

Problems solved by technology

The decrease of pH leads to the destruction of the protective film of steel reinforcement in concrete, accelerates the corrosion of steel reinforcement, causes the decline of bearing capacity, seriously affects the durability of alkali activated concrete, and limits the application of alkali activated concrete in engineering

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