How to mend concrete crack?

Concrete is a typical heterogeneous material, itself there are a lot of micro defects, due to improper maintenance, construction of early plastic shrinkage will greatly increase the number of micro cracks in the concrete, the micro cracks can improve the concrete internal stress concentration factor, reduces the tensile strength of concrete, there are some cracks will naturally phenomenon, when cracks in large concrete structures should be how to repair? Suggest you still understand first cracks in concrete situation! Concrete appear crack are as follows: the first kind of cracks are: along the reinforcement or the line direction of crack and fracture of time is usually within 24 hours after casting, the shape of the cracks are generally along the reinforcement or the direction of the line, the length is longer. Such fracture is mainly caused by settlement shrinkage and plastic shrinkage. The second crack is: the more structural cracks, the cracks are generally within one month after the casting time. Cracks appeared on the surface of four corners, fracture direction and edge almost 45 degree Angle, usually perfoliate crack. The most common place is located in the basement at both ends of the fracture, elevator shaft or core tube plate. Structure is more complex, more prone to this type of crack.

concrete crack repair method: when appear as above two situations of concrete crack, can use the polymer cement waterproof mortar ( Such as LeiBangShi pipe grouting, plugging king) Construction is convenient, repair, repair mortar with good construction and performance. Construction without vibration, mixed with water in the can use; High early strength, can maximum limit to speed up the construction schedule; Permeability resistance is strong, has the good artesian and penetration resistance, accord with the requirement of permeability in concrete; Adhesive performance is good, can maximize the chance that repaired polymer cement mortar and repair the tightly bonding between the grassroots.

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