Roof concrete cracks to find property.

The main causes of transverse cracks in cement concrete pavement are: ① the concrete pavement is not cut in time and is broken due to temperature shrinkage and drying shrinkage; ② The cutting depth is too shallow, because the cross section is not weakened obviously and the stress is not released, so a new shrinkage joint is generated at the shrinkage joint; (3) Uneven settlement of concrete pavement foundation (such as crossing rivers, trenches and widening road sections), resulting in slab bottom void and fracture; I hope my answer is helpful to you.

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If the crack does not affect the structural safety, the following methods can be adopted: 1. Surface repair method. This method is suitable for narrow joints to restore the surface beauty and improve the durability of components. Usually, film materials are laid along the surface of concrete cracks, and epoxy resin or resin impregnated glass cloth can be generally used. 2. Filling method. When the cracks are wide, V-shaped or U-shaped grooves can be chiseled along the cracked concrete surface, which can be filled with resin mortar materials or cement mortar or asphalt. 3. Injection method. When the crack width is small and deep, the repair method of injecting repair material into concrete can be adopted. Firstly, an injection tube is arranged at the crack, and other parts are sealed by surface treatment. Inject the material with low viscosity epoxy resin, and inject it with electric pump or manual pump for repair. If cracks affect the safety of the structure, it is necessary to strengthen the structure.