We all know that an important feature of epoxy floor paint is that it is seamless as a whole. No matter how large the area is, there is no joint. Therefore, before the construction of epoxy floor paint, concrete cement ground cracks need to be treated. The following epoxy floor paint manufacturers will give you a detailed introduction to the causes of concrete cement ground cracks and treatment methods. Reasons for concrete cement ground cracks: 1、施工缝
1. Construction Joints
Construction joints are not real "joints", but a joint between concrete poured after exceeding initial setting time and concrete poured first according to design requirements or construction needs.
2. Temperature stress cracks
Temperature stress cracks often occur in the construction of concrete floor. The main causes of these cracks are the excessive temperature difference between the foundation and the inside and outside of the concrete or the stress release caused by other reasons. According to the different manifestations, they can be divided into surface cracks, deep cracks and through cracks. Under certain conditions, surface cracks will develop into deep cracks and deep cracks will develop into penetrating cracks. Therefore, if cracks are not repaired in time, it will directly affect the decorative effect of epoxy floor.
3. Expansion joint
According to the structure layout, geological conditions and construction layout, construction intensity and other transverse joints in the structure, in order to meet the requirements of structural deformation, there should be no rigid filler between joints. Because the expansion joints need to meet the stress changes of the whole building, elastic materials are needed for the treatment of expansion joints, and metal sheets are laid outside to protect them
Repair of Cement Ground Cracks混凝土水泥地面裂缝处理方法：
Treatment of concrete cement ground cracks:
1. Surface repair
The main point of surface repair with epoxy resin paste is to clean the surface to be treated first, then brush the epoxy resin paste with brush repeatedly, every 3-5 minutes, until the thickness of the coating reaches about 0.5 mm. The penetration depth of epoxy resin slurry treated by this method can reach 5-15 mm, which can effectively rivet micro-cracks and prevent their continued diffusion.
2. Seam Sealing Method
Seam method is the most commonly used method in crack repair. It is used to repair concrete cracks when only surface treatment can not be fully repaired. It usually uses a high-speed rotating cutting machine to cut 15 mm x 30 mm "V" or "U" grooves along the cracks, clean and dry them, and insert plastic or rigid repair materials into the grooves to repair the cracks. To achieve the purpose of sealing cracks.
Methods for preventing cracks in concrete and cement floors:
1. Construction of Base Surface
Base construction has great influence on the construction quality of the whole project. We should arrange a scientific and reasonable construction plan according to the actual situation, require the basic quality of concrete to meet the standard, control the thickness of non-aggregate concrete cushion, and improve the compactness of foundation.
2. Strengthening Maintenance
Hydration reaction of concrete needs humid environment. Moist curing can improve early strength and crack resistance of concrete.
In addition, wet curing makes full use of the "dry shrinkage and wet expansion" characteristics of concrete, reducing the probability of dry shrinkage cracks in the early stage of concrete pouring. After the initial setting of concrete, the plastic film is covered immediately to prevent water loss. Especially for micro-expansive concrete, we must always keep wet and give full play to the expansive effect.
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