Early-Age Thermal Cracking in Laser-Screeded Concrete Slabs

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Title: Early-Age Thermal Cracking in Laser-Screeded Concrete Slabs

Author(s): H. Haynes

Publication: Special Publication

Volume: 204

Issue:

Appears on pages(s): 43-56

Keywords: case history; concrete slabs; cracks; curling; early age; fog curing; laser screed; slab-on-grade; temperature and shrinkage; thermal strain; thermal stress

Date: 8/1/2001

Abstract:
A case history is presented in which a laser-screeded slab showed more cracks than would be expected in conventional strip-cast slabs. It was determined that laser-screeded slabs are more sensitive to early-age, thermal cracking than strip-cast slabs because of extra restraint provided by fixed-edge boundary conditions. Among the possible solutions is closer spacing of contraction joints and fog curing during the first day.