High-durability concrete product with gradient structure, and preparation method thereof

A technology of concrete products and gradient structures, which is applied in the field of building materials, can solve problems such as unfavorable early strength, insufficient durability, and easy peeling, and achieve the effects of reducing efflorescence, improving erosion resistance, and improving deformation resistance

Active Publication Date: 2019-04-30
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, domestic and foreign proposals to modify concrete materials to improve durability mainly include three aspects: one is to use a large number of active admixtures, such as the patent "a composite admixture for improving the durability of ordinary concrete and its preparation method" (application No.: 201510876654.5) and "An Anti-corrosion Agent for Concrete and Its Preparation and Application" (Application No.: 200910045612.1) replace cement with a large proportion of active admixtures such as fly ash, waste residue, tailings, etc., reducing the porosity of concrete , but due to the reduction of cement, it is not conducive to the early strength; the second is to properly adjust the cement clinker mineral system, such as the patent "Erosion-resistant Low-calcium Portland Cement and Its Preparation Method" (application number: 201510729601.0) by improving the cement Belite content, reduce the content of tricalcium aluminate to improve its anti-ion erosion performance, and introduce micro-expanded MgO to improve the crack resistance of the material; the third is to adopt surface protection measures, such as "An anti-carbonation and anti-chloride ion elastic Architectural Coating" (Application No.: 201020263050.6) and "A Protective Coating for Reinforced Concrete Substrates Used in Chloride Corrosion Environments" (Application No.: 201520631929.4) use a variety of polymer coatings to brush multi-layer protective layers on the concrete surface to improve The anti-carbonization and anti-ion erosion ability of the material, such protective measures are direct and efficient, but it is easy to age under light conditions, and it is easy to peel off due to the huge difference in thermal expansion coefficient at the interface with the substrate, and there is a problem of insufficient durability

Method used

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  • High-durability concrete product with gradient structure, and preparation method thereof
  • High-durability concrete product with gradient structure, and preparation method thereof
  • High-durability concrete product with gradient structure, and preparation method thereof

Examples

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Effect test

Embodiment 1

[0029] A highly durable concrete product with a gradient structure, the preparation method comprising the following steps:

[0030] (1) Select ordinary portland cement to prepare the formula of C40 concrete, use calcium olivine powder (Bretts specific surface area 6800cm 2 g -1 ) as a dense admixture to replace 15% of the cement component, according to the national standard for mixing and molding process molding, curing in a standard curing room with a humidity of >95% and a temperature of 20±2°C for 1 day to demould to obtain a concrete specimen ;

[0031] (2) Place the concrete specimen obtained in step (1) in a drying oven at 50° C. and a relative humidity of 20% to dry for 24 hours, and then place it in an autoclave to carry out carbonation curing under a carbon dioxide atmosphere. The curing conditions are temperature 10° C., The carbon dioxide concentration is 90%, the relative humidity is 70%, the carbonization curing time is 12h, and the pressure in the autoclave is ...

Embodiment 2

[0037] A highly durable concrete product with a gradient structure, the preparation method comprising the following steps:

[0038] (1) Select fly ash Portland cement to prepare C50 concrete formula, and use wollastonite powder and calcium olivine powder as a dense admixture in a mass ratio of 5:5 (the Blaine specific surface area is 5410cm 2 g -1 ) to replace 15% of the cement component, and molded according to the mixing and molding process specified in the national standard, and cured in a standard curing room with a humidity >95% and a temperature of 20±2°C for 1 day to demould to obtain a concrete specimen;

[0039](2) Place the concrete specimen obtained in step (1) in a drying oven at 50° C. and a relative humidity of 20% to dry for 24 hours, and then place it in an autoclave for carbonation curing under a carbon dioxide atmosphere. The curing conditions are 30° C., The carbon dioxide concentration is 99%, the relative humidity is 90%, the carbonization curing time is ...

Embodiment 3

[0045] A highly durable concrete product with a gradient structure, the preparation method comprising the following steps:

[0046] (1) Select the formula of slag Portland cement to prepare C50 concrete, and use wollastonite powder and calcium olivine powder in a mass ratio of 2:8 as a dense admixture (the Blaine specific surface area is 5000cm 2 g -1 ) to replace 30% of the cement component, according to the national standard for mixing and molding process molding, curing in a standard curing room with a humidity of >95% and a temperature of 20±2°C for 1 day to demould to obtain a concrete specimen;

[0047] (2) Place the concrete specimen obtained in step (1) in a drying oven at 50° C. and a relative humidity of 20% to dry for 24 hours, and then place it in an autoclave for carbonation curing under a carbon dioxide atmosphere. The curing conditions are 20° C., The carbon dioxide concentration is 95%, the relative humidity is 90%, the carbonization curing time is 8h, and the...

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Abstract

The invention relates to a high-durability concrete product with a gradient structure, and a preparation method thereof. The preparation method comprises the following steps: 1) mixing for obtaining concrete: mixing a dense admixture for substituting a part of a cementing material to obtain the concrete; 2) pouring the concrete into a mold, molding the concrete, and curing and demolding the moldedconcrete to obtain a concrete test piece; and 3) drying the surface of the concrete test piece, carrying out carbonization curing on the dried concrete test piece in an autoclave in a carbon dioxideatmosphere, and then carrying out standard curing to obtain the high-durability concrete product with the gradient structure. The gradient structure which gradually densifies from the inside to the outside is formed on the surface of the concrete test piece through the carbonization curing treatment, and the surface carbonized dense layer can improve the corrosion resistance of the concrete material and prolong the service life; and the outer layer has a high strength, so the confinement effect is formed, thereby the deformation resistance of the test piece is improved, and the hardening of the concrete test piece is accelerated.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a highly durable concrete product with a gradient structure and a preparation method thereof. Background technique [0002] Concrete material is a complex porous heterogeneous body, its pores mainly include gel pores (mainly refers to the pores between gel particles), capillary pores and a small amount of internal defects and microcracks of cement stone, harmful gases or liquids from the outside It is easy to transmit or diffuse to the interior of the concrete through the pore structure of the concrete. Therefore, although there are many factors affecting the durability and the damage erosion process is complicated, the durability of the concrete is mainly related to its ability to resist the penetration of external harmful gases or liquids into its interior. At present, domestic and foreign proposals to modify concrete materials to improve durability mainl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B28/08C04B28/02C04B40/02C04B111/24C04B111/20
CPCC04B28/021C04B28/04C04B28/08C04B40/0231C04B2111/20C04B2111/24C04B2201/52C04B14/043
Inventor 王发洲穆元冬刘志超何永佳
Owner WUHAN UNIV OF TECH
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