A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Concrete Slab Curling Over Vapor Retarders
Concrete slab curling (also termed "warping") is the upward deformation of the slab at cracks or joints due to the development of a temperature and/or moisture gradient through the depth of the concrete after slab placement. Shortly after the placement, heat is generated in the slab interior by hydration of the cement. If the surface of the slab is exposed to cooler air, a temperature gradient can develop, causing the slab surface to contract relative to the slab interior and bottom and resulting in curling deformation. This generally occurs shortly after slab placement (within the first day), which supports the need to saw-cut contraction joints so that cracking resulting from the curling stresses occurs beneath the saw-cuts and not randomly. Placing concrete directly on a vapor retarder does not substantially impact the temperature-induced deformation, but it does affect the moisture-induced distortion. However, the general belief throughout the industry that a vapor retarder increases the curling is untrue -- a vapor retarder generally reduces the magnitude.
Concrete Slab Curling Over Vapor Retarders
Concrete slab curling (also termed "warping") is the upward deformation of the slab at cracks or joints due to the development of a temperature and/or moisture gradient through the depth of the concrete after slab placement. Shortly after the placement, heat is generated in the slab interior by hydration of the cement. If the surface of the slab is exposed to cooler air, a temperature gradient can develop, causing the slab surface to contract relative to the slab interior and bottom and resulting in curling deformation. This generally occurs shortly after slab placement (within the first day), which supports the need to saw-cut contraction joints so that cracking resulting from the curling stresses occurs beneath the saw-cuts and not randomly. Placing concrete directly on a vapor retarder does not substantially impact the temperature-induced deformation, but it does affect the moisture-induced distortion. However, the general belief throughout the industry that a vapor retarder increases the curling is untrue -- a vapor retarder generally reduces the magnitude.
Choosing Vapor Retarders and Concrete Mixtures
| British Library Online Contents | 2004
Prediction of moisture curling of concrete slab
| Online Contents | 2011
Prediction of moisture curling of concrete slab
| Online Contents | 2010
Prediction of moisture curling of concrete slab
| Online Contents | 2010
Prediction of moisture curling of concrete slab
| Springer Verlag | 2010