May 1974 Table of Contents

Problem Clinic Curing Walls in Hot Weather

We have been told to leave our wall forms in place in hot weather even after the wall is strong enough to strip. It was said they are needed for continued curing of the concrete. This wreaks havoc with our form reuse schedule. Is there any alternative? Read more

Problem Clinic Reducing Cavitation Damage

How can damage from high velocity water be reduced? We understand that cavitation occurs where turbulence causes vapor bubbles of very low pressure so that the concrete is torn out. Read more

Problem Clinic Tilt-In or Tilt-Out

In tilt-up construction is the crane used on the inside or the outside of the building? Read more

Problem Clinic Calcium Chloride Not the Most Damaging Deicer

We have been given to understand in the past that calcium chloride eats the cement that binds the aggregate in much the same way battery acid can eat a hole in our trousers. Last summer and fall we put in a plaza area of about 3,000 square feet of exposed Read more

Problem Clinic Brick for Exposed Aggregate Sidewalks

We are interested in building a sidewalk with exposed aggregate concrete that for architectural purposes matches the brick face of a building. Can the same brick used in the building be crushed and used as the exposed aggregate Read more

Problem Clinic Good Fractured Concrete

What is meant by a mechanically fractured surface, and why would anyone want it? Read more

Problem Clinic Protection Against Acid Attack in Sewage Plants

How much protection is needed for the concrete in a new sewage treatment plant? Read more

Problem Clinic Restraint Needed for Expansive Cements

In using shrinkage-compensating cement is it always necessary to provide restraint? If so, is it possible to keep the concrete from expanding beyond a certain amount? Read more

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