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Curling concrete floor. Curling in concrete floors causes consequences and solutions. If the total curl is less than 1 4 inch or curling occurs primarily in low traffic areas or under storage racks the owner can often live with it provided that cracking isn t excessive. Page 4 of 6 curling of concrete slabs if the curling had not been highlighted by the cracked brickwork joints it would probably not have been evident as the extent of curling is within typical floor construction tolerances for residential buildings. The best time to pour concrete is when temperatures are expected to remain above 50 degrees for five to seven days but plans can go awry with the arrival of.
When concrete slabs on grade curl the curling sometimes has little effect on floor performance. There are occasions however when curling isn t tolerable and repairs are needed. Both the canadian standards association csa and the american concrete institute aci recognize that control of curling is a designer responsibility. Curling is the distortion of a slab into a curved shape by upward or downward bending of the edges.
Curling of concrete slabs. Data from floor slabs indicates that tolerances losses from curling can result in up to a 50 reduction in tolerances that were originally. This occurs primarily due to differences in moisture and or temperature between the top and bottom surfaces of a concrete slab. N stepping at joints curling of adjacent panels may result in stepping ie a variation in the.
The occurrence is primarily due to differences in moisture and or temperature between the top and bottom surfaces of a concrete slab. Written by ramon planas masip. The american concrete institute. As a new concrete floor dries during the first year surface tension caused by this drying of the concrete creates shrinkage and more specifically a lifting or curling of the floor at all floor joints.
Reinforcing steel placed near the top surface of the slab can help restrain curling. Tolerance floor covering conundrum concrete international july 2003 includes two examples of measured floor flatness and levelness that decrease by as much as 50 in a year due to curling. Curling is the distortion of a slab into a curved shape by upward or downward bending of the edges. Placing 4 bars on 18 inch centers both ways and chairing the bars to keep them within an inch of the surface has been suggested see controlling curling and cracking in floors to receive coverings concrete construction july 1998 pp.
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