How to repair concrete cracks?

Concrete is a typical heterogeneous material, and there are a lot of micro-defects in itself. Due to improper construction and maintenance, the early plastic shrinkage greatly increases the number of micro-cracks in the concrete. These micro cracks increase the stress concentration in the concrete. The coefficient, which reduces the tensile strength of the concrete, will naturally appear some cracks. How to repair the cracks in large concrete buildings? Xiao Bian suggests that you first understand the cracks in the concrete!

Concrete cracks are:

The first type of crack is the crack that appears along the direction of the reinforcement or pipeline. The time for the crack to appear is generally within 24 hours after pouring. The shape of the crack is generally along the direction of the reinforcement or pipeline, and the length is relatively long. Cracks of this type are mainly caused by sinking shrinkage and plastic shrinkage.

The second type of crack is: Most of the structural cracks, cracks appear in the time generally within one month after pouring. The cracks appear at the four corners of the board, and the direction of the crack is almost at an angle of 45 degrees to the board edge, usually a penetrating crack. The most common places for cracks are at the base of the basement, at the bottom of the elevator shaft or core tube. The more complex the structure, the more likely it is that this type of crack has occurred.

Concrete crack repair method:

When concrete cracks occur in the above two cases, the polymer cement repair mortar can be used for repair. The repair mortar is easy to construct and has good construction and easy performance. No vibration is needed during construction. It can be used by adding water and stirring at the site. The early strength is high, and the compressive strength can reach 20Mpa a day, which can maximize the progress of the project. It has strong impermeability, good impermeability, and impermeability of 1.7Mpa. Pressurized water is impervious and meets the requirements of impermeability of P16 concrete. Adhesion performance is good, and it can ensure the close adhesion between polymer cement repair mortar and repair base.