June 1992 Table of Contents

Problem Clinic Timing Joint Sawing in Cold Weather

We placed a 46x90-foot concrete floor slab that's 5 inches thick. The plans called for sawed control joints at 15- to 18-foot spacings. The slab was placed during cold weather so we used heated mixing water and 2% calcium chloride in the concrete. Concret Read more

Problem Clinic Causes of Spot Retardation

What causes one part of a concrete slab pour to set slower than the rest of the pour? The amount of concrete involved is less than a truckload. The finishers have to wait longer for these spots to set up or settle for a slab that's wavy because some parts Read more

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