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

An admixture and concrete technology, applied in the field of concrete, can solve problems such as the decline of bearing capacity, affecting the durability of alkali-induced concrete, and accelerating the corrosion of steel bars

Pending Publication Date: 2022-01-07
CCCC FOURTH HIGHWAY ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

Examples

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preparation example Construction

[0037] In the present invention, the preparation method of the mineral fine powder preferably comprises the following steps:

[0038] (1) after the ore is crushed by the jaw crusher, the ore particles are obtained;

[0039](2) the ore particles obtained in the step (1) are sent to the storage hopper by the elevator, and then uniformly and quantitatively sent to the main grinding chamber of the European version pulverizer through the vibrating feeder for grinding to obtain ore powder;

[0040] (3) classifying the ore powder obtained in the step (2) by a powder concentrator, and the ore powder meeting the fineness enters the novel isolation type cyclone powder collector through the pipeline with the airflow, and is separated and collected. The discharge port is sent to the stone powder silo by the conveying device for use; the unqualified ore powder is separated by the powder separator and thrown to the cylinder wall, and then falls back to the main grinding chamber of the Euro...

Embodiment 1

[0058] An admixture for improving the anti-carbonation ability of concrete, which is composed of the following components in parts by mass: 8-12 parts of mineral fine powder, 3 parts of silica fume, 15 parts of metakaolin, and 3 parts of methyl silicate, 3 parts of expansion agent, 6 parts of superplasticizer and 9 parts of self-healing intumescent fiber anti-cracking waterproof agent;

[0059] The mineral fine powder is prepared from quartz, and the particle size of the mineral fine powder is 325 mesh; the mass percentage content of silica in the silica fume is ≥90%, and the particle size of the silica fume is 800-800 mesh. 1000 mesh, the silica fume is silica fume produced by Taibaili Building Materials; the metakaolin is metakaolin produced by BASF, Germany; the methyl silicate is sodium methyl silicate; the expansion agent is Weifang The U-shaped expansion agent produced by Puxin Building Materials Co., Ltd.; the superplasticizer is sulfonated melamine formaldehyde condens...

Embodiment 2

[0063] Change the mass fraction of metakaolin to 10, and other conditions are the same as in Example 1.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/42C04B28/00C04B103/65
CPCC04B40/0039C04B28/00C04B2103/65C04B2201/50C04B22/08C04B22/06C04B22/16C04B22/0006C04B24/42C04B2103/0068C04B2103/32
Inventor 刘志军于建新彭卫星赵晓辉吕廷建王清祥魏得恩张丽娜韦永博
Owner CCCC FOURTH HIGHWAY ENG
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