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Anti-freezing concrete and preparation method thereof

A technology for concrete and cementitious materials, applied in the field of concrete, can solve the problems of excessive admixtures, complex process, difficult mixing ratio design, etc., and achieve the effects of excellent frost resistance, simple formula, and uncomplicated production process

Inactive Publication Date: 2021-01-05
SHANGHAI CONSTR NO 1 GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, although traditional anti-freeze concrete has strong anti-freeze performance in extremely low temperature environments, it has defects such as difficult design of mix ratio and complicated process due to the addition of too many admixtures.

Method used

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  • Anti-freezing concrete and preparation method thereof
  • Anti-freezing concrete and preparation method thereof
  • Anti-freezing concrete and preparation method thereof

Examples

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Effect test

Embodiment 1

[0039] A kind of frost-resistant concrete, the raw materials used are composed of aggregate, cementitious material, water-reducing agent, waterproofing agent and water, calculated on the basis of each cubic meter of frost-resistant concrete:

[0040] The amount of raw material aggregate, cementitious material, water reducing agent and waterproofing agent used is as follows:

[0041]

[0042] The amount of raw material water used is 176kg, which is calculated according to the ratio of water: gelling material weight ratio of 0.44:1;

[0043] The aggregate is composed of 745kg medium sand and 1072kg crushed stone, the ratio of medium sand and crushed stone is calculated by weight ratio, medium sand: crushed stone is 1:1.44;

[0044] The medium sand has a fineness modulus of 2.7, a porosity of 42%, and an apparent density of 2610kg / m 3 , the particle size is 0.35-0.50mm;

[0045] The 1072kg gravel is mixed by 429kg of 5mm≤particle diameter D<20mm gravel and 643kg of 20mm≤part...

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Abstract

The invention discloses anti-freezing concrete and a preparation method. The anti-freezing concrete is composed of aggregate, a cementing material, a water reducing agent, a waterproof agent and water, each cubic meter of the anti-freezing concrete contains 18-17kg of the aggregate, 400kg of the cementing material, 7.2kg of the water reducing agent and 10kg of the waterproof agent, the content ofwater is calculated according to the weight ratio of water to cementing material of 0.44: 1, the aggregate is composed of medium sand and broken stone, the broken stone is formed by continuously proportioning broken stone with the particle size D of greater than or equal to 5mm and less than 20mm and broken stone with the particle size D of greater than or equal to 20mm and less than or equal to 40mm in two stages. The preparation method comprises the steps of adding water accounting for 1 / 3-1 / 2 of the total volume into the water reducing agent, uniformly mixing the obtained water reducing agent aqueous solution with the cement, the II-grade fly ash and the waterproof agent, adding the medium sand, the gravels and the residual volume of water, controlling the rotating speed to be 80-100r / min, and stirring for 60-180 seconds, thereby finally obtaining the anti-freezing concrete with high compactness, small shrinkage and excellent anti-freezing property.

Description

technical field [0001] The invention relates to a concrete composition, in particular to a frost-resistant concrete and a preparation method thereof, and belongs to the technical field of concrete. Background technique [0002] In construction projects, the unstable ambient temperature also poses a great challenge to the concrete structure of roads and buildings. Therefore, the concrete structure is required to have high durability, especially in the cold season in the north. The temperature is lower than minus 20 degrees all the year round, which has extremely high requirements on the frost resistance of concrete. In cold regions, the biggest problem of concrete durability is frost damage. Therefore, it is of great engineering value to study the anti-freeze performance of concrete, prevent concrete from being damaged by freezing, and propose a concrete with excellent anti-freeze performance. [0003] Most of the antifreeze concretes currently on the market are aimed at are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B14/02C04B14/06C04B111/27C04B111/76
CPCC04B14/02C04B14/06C04B28/04C04B2111/27C04B2111/76C04B2201/50C04B7/26C04B2103/302C04B2103/65
Inventor 孙云飞周宗博陈志阔侯金辰张子恺
Owner SHANGHAI CONSTR NO 1 GRP
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