Freezing-thawing resistant concrete mixture and preparation method thereof

Abstract

Relating to the technical field of concrete, the invention discloses a freezing-thawing resistant concrete mixture and a preparation method thereof. The key point of a technical scheme lies in that: the freezing-thawing resistant concrete mixture comprises the following raw materials by weight: 320-340 parts of cement, 700-720 parts of sand, 940-980 parts of rubble, 100-120 parts of an admixture,6-10 parts of reinforced fiber, 10-20 parts of anti-permeability agent, 10-12 parts of a water reducing agent and 120-140 parts of water. Through cooperation of the reinforced fiber and the admixture,the porosity of concrete can be reduced, the compactness of concrete can be enhanced, the anti-permeability and anti-cracking performance and freezing-thawing resistance of concrete are improved, andthe setting and hardening speed of concrete can be increased.

Description

technical field [0001] The invention relates to the technical field of concrete, more specifically, it relates to a freeze-thaw resistant concrete mixture and a preparation method thereof. Background technique [0002] Ordinary concrete refers to the artificial stone with cement as the main cementitious material, mixed with water, sand, stones, admixtures and mineral admixtures evenly, densely formed and cured; according to the different use environments of concrete, the performance of concrete The requirements are also different; among them, hydraulic concrete refers to the concrete used by buildings (or parts of buildings) that are often or periodically subjected to water and can guarantee the long-term normal use of buildings under the above conditions; hydraulic concrete Concrete is often used in water, underwater, and water level fluctuation areas. When it is often in contact with environmental water, it is required to have good impermeability; in cold areas, especially...

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Problems solved by technology

[0003] For hydraulic concrete exposed to the atmosphere and water for a long time, it should also require low calorific value to avoid temperature cracks. Therefore, it is necessary to reduce the heat of hydration of cement as much as possible. In order to reduce the heat of hydration of cement, in addition to reducing In addition to the amount of cement, a retarder should also be added to reduce the hydration rate and heat of hydration of the cement, so that it has a long enough time to release heat, thereby reducing the cracks caused by the temperature difference between the inside and the outside of the concrete; but the retarder The addition of the concrete will reduce the early strength of the concrete and affect the construction progress, especially in the construction environment in contact with water. Although the addition of traditional accelerators can make the concrete harden quickly, the heat of hydration after hardening is difficult to release. The temperature difference between the inside and outside of the concrete is large, and it is easy to crack

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