September 1992 Table of Contents

Problem Clinic Saving a Non-Air-Entrained Concrete Curb

We did concrete curb and gutter work for a school parking lot. Concrete was supposed to be air-entrained but it was a long haul to the job and the concrete lost air. We placed it anyway. Now the owner says we have to rip out $5,000 worth of curb and repla Read more

Problem Clinic Friction Factor for Concrete on Concrete

We're designing a retaining wall that consists of precast concrete units stacked on each other. What's the coefficient of friction for concrete on concrete? The manufacturer of the units says it's 0.75, but that sounds high to me. Read more

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