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Concrete Q & A: Shrinkage and w/cm
Title: Concrete Q & A: Shrinkage and w/cm
Publication: Concrete International
Volume: 35
Issue: 7
Date: July 1, 2013
Q. Section 9.5.1 of ACI 302.2R1 states that concretes with a water-cementitious material ratio (w/cm) of 0.40 to 0.45 and compressive strengths of 4500 to 5000 psi (31 to 34 MPa) are likely to have an increased potential for shrinkage, curling, and cracking. Can you explain why? It was my understanding that using lower w/cm would produce concrete with lower shrinkage and curling.
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