Transcription of Concrete Defects – Causes and Remedies
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Concrete Defects – Causes and Remedies
Concrete Defects Causes and RemediesByM. Al Nasra, PhD, PE9/25/20081 Concrete Methods and Principles, (c) Al NasraCrackingCracking may result from one or more of the following:1.) Restraint: Restraint of movements brought about by drying shrinkage or thermal contraction due to poor practice such as:a.) Contraction joints/construction joints are too far apartb.) Contraction joints are not deep enough (1/4 slab depth)c.) Slabs are strongly restrained at perimetersd.) No isolated joints around columnse.) No joint at re-entrant anglesf.) Low strength, high w/c ratiog.) Deficient curingh.) Bonding to subterranean structures such as footing pads9/25/20082 Concrete Methods and Principles, (c) Al NasraCracking (continued)2.) Uneven support by a poorly prepared sub-grade, poor drainage, or uneven support due to curling3.) Expansive clay in the ) Sulfates in sub-grade moisture5.
Concrete Defects –Causes and Remedies By M. Al Nasra, PhD, PE 9/25/2008 Concrete Methods and Principles, 1 (c) Al Nasra
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