September 1975 Table of Contents

Problem Clinic Rubber Void Formers Shorten When Inflated

If we use pneumatic tubes to form voids how much extra length should we allow? Read more

Problem Clinic Frost Protection From Vacuum Treatment

Does vacuum treatment remove enough water from a floor so that it is adequately protected against early frost damage without supplying heat from salamanders or providing other winter protection? Read more

Problem Clinic Concrete for Stairways

We had trouble placing a stairway with some leftover concrete. What is a good mix for stairways? Read more

Problem Clinic Reducing Popouts From Alkali-Aggregate Reaction

Popouts from alkali-silica reaction are common in our area, but worse on some jobs than others. Besides using low-alkali cement what can we do to minimize the problem? Read more

Problem Clinic Admixtures and Additions

What is the difference between an admixture and an addition? Read more

Problem Clinic Driving Dowels Into Stiff Concrete

Is it all right to stick or drive dowels into concrete that has been placed 60 to 90 minutes earlier when the temperature is about 70 degrees F? Read more

Problem Clinic Age of Mix Being Placed Doesn't in Itself Predetermine Cold Joint

Can a mix that is more than two hours old be placed without producing a cold joint? Read more

Problem Clinic One-Way and Two-Way Slabs

What is meant by a one-way and a two-way slab? Read more

Problem Clinic Special Trowels for White Concrete

How can we avoid trowel burns on hard-troweled concrete made with white cement? Read more

Problem Clinic Preventing Curling of Floor Slabs

What is a reliable method of preventing curling in floor slabs? Read more

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