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After the concrete has begun to harden, cracks will start to show. These are known as “green” cracks, and are a normal occurrence. Green cracks are the result of uneven drying shrinkage of the concrete. Green cracks are not considered to be a cause of concern.
Cracks of this width cannot be repaired. However, they are often dealt with by lengthening or reducing the distance between the cracks. If concrete can be spackled over a crack, it can often be concealed, and the integrity of the structure is not usually compromised.
After the concrete has begun to set, cracks of 20 mm or more in width are considered a potential concern. Such cracks are usually found in floors (where concrete is thin) and walls (where concrete is thick). These cracks are also referred to as “dry” cracks, and are typically caused by the movement of the building during construction. Dry cracks can also be found in concrete that has failed to harden in a timely manner, or concrete that has failed to re-drape itself over the top of the form.
After the concrete has set, cracks of 20 mm or more in width are considered a potential concern. Such cracks are usually found in floors (where concrete is thin) and walls (where concrete is thick). These cracks are also referred to as “dry” cracks, and are typically caused by the movement of the building during construction. Dry cracks can also be found in concrete that has failed to harden in a timely manner, or concrete that has failed to re-drape itself over the top of the form.
After a building is completed, cracks can slowly widen again. This will typically occur in walls, floors, and ceilings, and typically within the first year. The most common reason for cracks to widen is that the building was improperly constructed. The problem can become exacerbated by changes in temperature, moisture, air pressure, wind or vibration.
After a building is completed, cracks can slowly widen again. This will typically occur in walls, floors, and ceilings, and typically within the first year. The most common reason for cracks to widen is that the building was improperly constructed. The problem can become exacerbated by changes in temperature, moisture, air pressure, wind or vibration. An EOR can typically address this by performing a visual inspection, and providing recommendations to the contractor.
Consider a 450,000 sq. ft. office building featuring a concrete tilt-up wall system with a floor slab on grade. The building is to be constructed with four panel wall heights of 30, 30, 30 and 24 feet. The floors slabs are to consist of 4 inch thick reinforced concrete precast slab panels with a 12% depth-to-thickness ratio for crack resistance. The tilt-up wall panels will be attached to the building frame with a reinforced diaphragm chord at the roof and foundation for restraint, whereas the floors will be grouted at the site, with positive surface connections at the slab. A maximum allowable panel width of 30 feet is specified, and the potential for cracking in the tilt-up wall panels is calculated as a restraint force. 827ec27edc