Sulfate-erosion-resistant concrete admixture, preparation method thereof and concrete

A concrete admixture and sulfate-resistant technology, applied in the direction of hydrotalcite and other directions, can solve the problems of reducing the mechanical properties of concrete, complicated preparation process of the admixture, affecting the promotion and application of products, etc. Small, cost-reducing effect

Active Publication Date: 2022-06-24
BEIJING BUILDING MATERIALS ACADEMY OF SCI RES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, there are still some problems in the following two existing concrete admixtures for sulfate corrosion resistance: one is to add admixtures such as fly ash and mineral powder, and the amount of such admixtures is large to achieve sulfate corrosion resistance Therefore, it will reduce the mechanical properties of concrete; the second is to synthesize admixtures through chemical reagents. The preparation process of such admixtures is complicated and the cost is high, which seriously affects the promotion and application of products.

Method used

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  • Sulfate-erosion-resistant concrete admixture, preparation method thereof and concrete
  • Sulfate-erosion-resistant concrete admixture, preparation method thereof and concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The sulfate-resistant concrete admixture provided in this example contains the following components by mass: 100 parts of barium carbonate, 100 parts of barium hydroxide, 80 parts of hydrotalcite, 50 parts of fly ash, and 50 parts of mineral powder.

[0020] The preparation method of the sulfate-resistant concrete admixture provided in this embodiment includes: preparing hydrotalcite, and mixing barium carbonate, barium hydroxide, hydrotalcite, fly ash and mineral powder in prescribed amounts; the preparation method of the hydrotalcite includes mixing Magnesium nitrate, aluminum nitrate, sodium carbonate, sodium hydroxide and water are mixed in a mass ratio of 21:7:1:6:180 to prepare a mixed alkali solution, the pH of the solution is controlled to be 9, and after crystallization at a constant temperature for 24 hours, suction filtration, drying and grinding , calcined at 450°C for 200min.

Embodiment 2

[0022] The sulfate-resistant concrete admixture provided in this example adopts the same preparation method as in Example 1, except that the following components are used in parts by mass: 100 parts of barium carbonate, 100 parts of barium hydroxide, 80 parts of hydrotalcite, powder 60 parts of coal ash and 60 parts of mineral powder.

experiment example 1

[0030] The performance tests of the sulfate-resistant concrete admixtures in Examples 1-2 and Comparative Examples 1-3 were carried out. With reference to "Anti-sulfuric acid corrosion preservatives for concrete" (JC / T 1011-2006), the cement in the mortar is Portland benchmark cement, the sand is standard sand, and the water is tap water. During the test, the amount of sulfate-resistant concrete admixtures accounted for 12% of the cement, the performance test results of its mortar are shown in Table 1.

[0031] Table 1 Test results of performance of anti-sulfate corrosion concrete admixtures

[0032]

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Abstract

The invention relates to the field of concrete admixtures, in particular to a sulfate-attack-resistant concrete admixture, a preparation method thereof and concrete. The sulfate attack resistant concrete admixture comprises the following components in parts by mass: 90 to 120 parts of barium carbonate, 90 to 120 parts of barium hydroxide, 80 to 100 parts of hydrotalcite, 50 to 100 parts of fly ash and 50 to 100 parts of mineral powder. According to the sulfate-erosion-resistant concrete admixture provided by the invention, the adsorption effect of the admixture on sulfate ions is improved by adding barium carbonate and barium hydroxide, the sulfate-erosion-resistant performance of concrete is remarkably improved, meanwhile, the doping amount of hydrotalcite is relatively small, and the cost of the admixture is greatly reduced; the hydration activity of the fly ash and the mineral powder is improved by utilizing the strong alkalinity of barium hydroxide, so that the influence of the admixture on the mechanical property of the concrete is relatively small.

Description

technical field [0001] The invention relates to the field of concrete admixtures, in particular to a sulfate-resistant concrete admixture, a preparation method thereof, and concrete. Background technique [0002] Concrete is often eroded by salt solution during practical engineering applications (especially in high-salt environments). Sulfate attack significantly reduces the functionality and safety of concrete elements, shortens concrete life, and increases engineering structural repair or renovation costs. Sulfate attack of concrete is generally considered to include both physical crystallization damage due to sulfate and chemical damage through chemical reactions to produce aggressive products. Therefore, the use of external modifiers to improve the durability of concrete has become a research hotspot. Invention CN 109650769 A discloses a preparation method of modified emulsified asphalt. The admixture can improve the anti-sulfate corrosion resistance of concrete while ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/10C04B22/06C01F7/785C04B28/04C04B111/20
CPCC04B40/0039C04B28/04C04B22/10C04B22/064C04B2111/2015C04B2201/50C04B22/06C04B18/08C04B18/12C04B14/06Y02W30/91
Inventor 康旺黄天勇房桂明陈军亮张晶晶卢爽兰皓翔
Owner BEIJING BUILDING MATERIALS ACADEMY OF SCI RES
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