Anti-freezing concrete and preparation method thereof

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...

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.

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