What are the concrete crack prevention measures? Measures to prevent cracking of concrete

The painting method is carried out by hand.

Adjust the repair material and apply it to the concrete, and then close the surface of the concrete, which can repair the damaged concrete.

You can also use the method of surface stitching to repair the damaged concrete, you can drill holes or groove on both sides of the concrete cracks, and then put the U-shaped steel bar in the groove, and then the epoxy resin will be poured into the groove, waiting for fixation, you can quickly repair the damaged concrete.

The measures to prevent concrete cracking are as follows:

1. Preferential use of slag cement with low heat of hydration to mix concrete, and appropriate use of retarder.

2. Under the premise of ensuring the design strength level of concrete, appropriately reduce the water-cement ratio and reduce the amount of cement.

3. Reduce the temperature of concrete into the mold and control the temperature difference between the inside and outside of the concrete.

4. Cover the concrete with thermal insulation and moisturizing materials in time.

5. The cooling water pipe can be pre-embedded, and the circulating water can be used to bring out the heat inside the concrete for artificial heat conduction.

6. Concrete, referred to as:"Concrete (tóng).": refers to the general term of engineering composite materials that cement aggregates into a whole by cementitious materials. The word concrete usually refers to the use of cement as cementitious material, sand and stone as aggregates; Cement concrete, also known as ordinary concrete, is widely used in civil engineering engineering when it is mixed with water (which can contain admixtures and admixtures) in a certain proportion and is mixed to obtain cement concrete.

7. Concrete has the characteristics of abundant raw materials, low quality and simple production process, so that the amount of concrete is getting larger and larger. At the same time, concrete also has the characteristics of high compressive strength, good durability and wide range of strength grades.

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For concrete structures with large cross-sectional differences, the deep part can be poured first, and the static stop can be 2 3 hours, and after the settlement is stable, it can be poured at the same time with the upper thin cross-section concrete to avoid cracks caused by excessive settlement. Secondly, the ground must be poured through when pouring! Let it absorb enough water to prevent cracking!

The main reason for the cracking of large-volume concrete is the temperature stress crack caused by the temperature difference, so it is mainly from the perspective of controlling the temperature stress to take temperature control and anti-cracking measures in the construction

1. Control the maximum temperature inside the concrete, the specific operation is to first reduce the pouring temperature of the concrete, then control the thickness of the pouring layer, then cool the water, and then install the snake Qiaoqiao water pipe in the concrete body to cool down the water, and finally cured through the surface flowing water;

2. Control the intermittent time of the level;

3. Strengthen the insulation of the concrete of the dam body, and reduce the temperature difference between the inside and outside of the concrete;

4. Improve the crack resistance of the concrete layer.