The demand for housing construction has been rising so far, and it has attracted a lot of attention. When the house is built, the construction of the floor slab is very important, on the one hand, it is necessary to pay attention to the stability of the structure, on the other hand, it is also necessary to pay attention to the distance between the floor slabs. The following is the reason for the cracks in the floor slab shared by the waterproof duck, let's learn it together.
First, the cause of cracks in the floor slab analysis
1. Base surface causes. Below the concrete floor is the base surface of the concrete, and the flatness of the base surface determines whether the concrete structure can be evenly stressed. When the floor slab encounters a weight load, if the thickness of the floor slab is different and the bearing force is different, the force strength is different and the demarcation part is broken.
2, water ash ratio problem. Concrete is made of clear water, sand, cement, gravel and other materials, generally has a fixed ratio, can not be easily changed.
3, aggregate problems. Aggregate needs to be added to concrete, mainly sand and gravel, but the selectivity of aggregate is more, and the material and size are different. If you choose fine sand and stone, then the fine stone concrete of the floor slab will cause sand or dust due to the increased shrinkage of the concrete. To reduce the likelihood of sanding concrete, aggregates that are clean, contain less active silica and are continuously graded should be selected as much as possible.
4. Maintenance problems. After the completion of the concrete floor construction, the dry shrinkage reaction is easy to occur in the case of water shortage, which leads to cracking of the floor slab, and it is necessary to maintain with water, which can be sprinkled with water or use concrete maintenance materials to prevent cracks on the surface of the floor slab.
5. Cement problem. Cement is the main component of concrete, is the premise of concrete strength, the use of expired cement or unqualified cement products, concrete floor is prone to cracks.
6, the influence of temperature. Since concrete does not conduct heat, heat dissipation is slow. Thermal expansion and contraction, the concrete floor will be deformed due to temperature changes, especially if the large area of concrete is not cut according to the construction standards.
Second, the repair method of cracks in the floor slab
1. Local caulking. Clean the crack area, remove the loose material around the crack, wet the crack with clean water, and let it stand for 24 hours. Fill in the cracks with grooved grout and smooth the base surface with a spatula.
2. Large area filling. Generally, it can be filled with crack-resistant plaster mortar, scrape the base surface, find the flatness and perpendicularity of the base surface, and scrape the base surface flat.
Finally, a warm reminder, waterproof engineering needs a professional waterproof engineering team, choose professional and high-quality waterproof materials, waterproof duck care for every customer service.