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Concrete rheological preservative and preparation method and application thereof

A technology for concrete and preservatives, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., to achieve the effects of improved resistance to chloride ion penetration, reduced emptying time, and simple preparation method

Active Publication Date: 2018-02-13
CHINA ACAD OF BUILDING RES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to significantly improve the sulfate corrosion resistance and chloride ion penetration resistance of concrete, and at the same time greatly improve the rheological properties of concrete, so as to solve the application problem of concrete in salt corrosion environment

Method used

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  • Concrete rheological preservative and preparation method and application thereof
  • Concrete rheological preservative and preparation method and application thereof
  • Concrete rheological preservative and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1: Preparation of concrete rheological preservative

[0028] Put fly ash, silica micropowder, limestone powder, metakaolin, and silica fume into the mixing equipment according to the proportion, and stir evenly. The component content implemented by each component is shown in Table 1.

[0029] Wherein, the "fly ash" used in the examples is the fine ash collected from the flue gas after coal combustion. The fly ash used for the concrete rheological preservative of the present invention is Class I fly ash, and the specific surface area is 1197m 2 / kg, the water requirement is 89%.

[0030] The "silica powder" used is processed from pure quartz powder through advanced ultra-fine grinding process. The concrete rheological preservative of the present invention uses silicon micropowder, specific surface area is 1311m 2 / kg.

[0031] The "limestone powder" used is a powdery material that is ground to a specified fineness with limestone of a certain purity as th...

Embodiment 2

[0036] Embodiment 2: performance test and result

[0037] In order to verify the performance effect of the concrete rheological preservative of the present invention, the inventor selected concrete with a strength grade of C45 to test the performance of the concrete rheological preservatives A1-A6 prepared in the above examples. The ratio of C45 is shown in Table 2. In accordance with the "Technical Regulations for the Application of High-Strength Concrete" JGJ / T281-2012, the emptying time test of the inverted slump cylinder was carried out, and the "Standard for Test Methods for Long-term Performance and Durability of Ordinary Concrete" GB / T 50082-2009 was carried out for the sulfate corrosion resistance test and anti-corrosion test. Chloride ion penetration test, its performance test results are shown in Table 3.

[0038] Basic properties of concrete raw materials: cement is Jidong P.O 42.5, fly ash is Class II fly ash, mineral powder is S95 grade mineral powder, sand is m...

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Abstract

The invention relates to a concrete rheological preservative as well as a preparation method and an application thereof, and belongs to the technical field of civil engineering materials. The concrete rheological preservative comprises the following components in percentage by weight: 50-60% of fly ash, 5-20% of silica micropowder, 5-15% of limestone flour, 10-20% of metakaolin and 5-15% of silica fume. According to the concrete rheological preservative, the preparation method is simple, the rheological performance of concrete can be remarkably improved, and the sulfate corrosion resistance and chloride penetration resistance of the concrete can be greatly enhanced.

Description

technical field [0001] The invention relates to a concrete rheological preservative and its preparation method and application, belonging to the technical field of civil engineering materials. Background technique [0002] Saline soil is widely distributed in my country, including inland saline soil, coastal saline soil and alluvial plain saline soil, covering an area of ​​more than 200,000 square kilometers. Saline soil and its groundwater contain a large amount of salt, mainly sulfate or chloride. Concrete is the most widely used structural material in engineering construction. When it is in the service environment of saline soil and groundwater, salts will continue to corrode concrete, seriously affecting the durability and service life of concrete structures. [0003] Aiming at the problem of salt corrosion, technical measures include: 1) Use anti-sulfate cement to improve the anti-corrosion performance of concrete, but the project cost is high. Studies have shown that ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B18/14C04B103/60
CPCC04B40/0042C04B2103/60C04B18/08C04B14/062C04B14/28C04B14/106C04B18/146Y02W30/91
Inventor 周永祥王晶王永海高超贺阳宋普涛
Owner CHINA ACAD OF BUILDING RES
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