What points should be paid attention to when pouring concrete in rainy days?

1, when pouring in light rain, the following measures should be taken:

1, appropriately reduce the water consumption for concrete mixing and the slump of export concrete, and appropriately reduce the water-binder ratio of concrete when necessary;

2. Strengthen the drainage in the warehouse to prevent the surrounding rainwater from flowing into the warehouse;

3. Do a good job of protecting the surface of fresh concrete, especially the joints.

Second, how to deal with the sudden rainstorm:

1. If the rain continues to flow down the concrete, the concrete will fall down, just like a handful of flour thrown into the water, and it will be diluted. The concrete without strength will be reworked in a large area in the future.

2. In the pouring process, in case of heavy rain and rainstorm, stop feeding immediately, keep the construction joints, and cover the concrete that has been put into the warehouse after vibrating compaction.

3. After the rain, the accumulated water in the warehouse must be removed first, and the parts washed by the rain should be treated immediately. If the concrete can be reshaped, the joint concrete shall be laid and poured continuously. Generally speaking, concrete has been initially set. If the surface is poor, it should be chiseled away and treated with higher concrete.

Third, matters needing attention:

1, all materials should be stacked off the ground, covered and protected, and the ground should be kept dry. There should be drainage measures around, and the reinforcement materials should be padded with wooden boards for waterproofing.

2, template support system to ensure support on a solid foundation. Column, plate, wall template cleaning mouth, help to eliminate water, product.

3. Formwork coated with water-soluble release agent should prevent the release agent from being washed away by rain, so as to ensure smooth and safe demoulding and concrete surface quality.

4, steel welding shall not be carried out in rainy days, to prevent weld or joint embrittlement.

5, beam slab concrete construction, all build fortification canopy, in case of heavy rain or rainstorm, stop construction. For continuous pouring concrete, prepare enough rain gear and adjust the construction mixture ratio.

6, the rainy season construction in a timely manner to determine the moisture content of aggregate, adjust the mixture ratio at any time, to ensure the quality of concrete. The measuring scale should regularly check the accuracy and sensitivity to ensure accurate measurement.

Extended data structure preparation

I. Materials:

Cement: P.S32.5 slag portland cement. Have the factory certificate and retest report.

Sand: fine sand. The silt content of concrete is not more than 5% when it is lower than C30 and not more than 3% when it is higher than C30.

Stones: particle size 16-30mm; when the concrete is lower than C30, the silt content is not more than 2%. When it is higher than C30, it is not more than 1%.

Concrete admixture: FJ- 1 pumping agent. Should comply with the provisions of the relevant standards, its dosage after the test meets the requirements, before use.

Second, the operating conditions

1. Concrete layer formwork, steel bar, top embedded parts and pipes have all been installed, which meet the design requirements after inspection, and the concealment and pre-inspection procedures have been handled.

2. Shelves and. After the concrete pouring is completed and passed the inspection.

3. Cement, sand, stone and admixture meet the requirements of relevant standards after inspection, and the laboratory has issued a notice of concrete mixture ratio.

4. The scale (or automatic feeding system) has been tested accurately, and the vibrator (rod) has passed the trial operation.

5. The foreman has conducted comprehensive construction technical training for the operation team according to the construction scheme, and the application for concrete pouring has been approved.

References:

Baidu encyclopedia-concrete pouring? Construction preparation work