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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Altitude and Mountain Climbing: Kestrel 2500 and Kestrel 4000

Kestrel Weather & Environmental Meters have long been an essential tool used by mountain climbers, hikers, and outdoor enthusiasts alike to stay one step ahead of inclement weather.   Climbers have even used Kestrel meters under the most extreme weather conditions while scaling Mt. Everest. Last month, EXP Adventures, LLC, a company whose innovative approach toward providing time-pressed, intrepid travelers with challenging and culturally immersive experiences, took a group of climbers to brave Mt. Washington, the highest mountain in the Northeastern United States. Located in the White Mountains range of New Hampshire at an elevation of 6,288 feet, Mt. Washington is...

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