HOW TO PREVENT PLASTIC SHRINKAGE CRACKS

By Luke M. Snell Director, Concrete Industry Management, Del E. Webb School of Construction Arizona State University, Tempe, Arizona ABSTRACT: One of the problems that contractors face is to identify the weather conditions and to determine if the concrete placements should proceeds. From past research, it has been shown that the three weather conditions (air temperature, humidity and wind velocity) and the concrete temperatures are the best indicators to determine if plastic shrinkage cracks will develop. A Nomograph was developed and published in many American Concrete Institute (ACI) committee reports as well as by the Portland Cement Association (PCA). Unfortunately,...

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