February 1974 Table of Contents

Problem Clinic Aid From Researchers

We have sometimes found help for some of our construction problems by talking to someone at a nearby research institute or university. Problems sometimes arise, however, that are outside the realm of their activities. Is there any catalog of research work Read more

Problem Clinic Finding the Heat Leaks

Now that fuel shortages are here we are interested to know if there is any rapid way of detecting the locations of heat leaks in building walls. Read more

Problem Clinic Bad Breaks Aren't Good Signs

Is a nonconical test cylinder fracture a sign that something specific is wrong with the concrete or the test? Read more

Problem Clinic Cleaning Concrete Decks From the Inside Out

Part of the problem with deteriorating bridge decks is the attack of salts on reinforcing steel. If we repair the bad concrete how can we be sure there is no salt that has penetrated the good concrete where it may attack the steel at a later time? Read more

Problem Clinic Small Forming Errors Make Big Problem

When we formed the second lift of a 94-foot wall we found that the first lift was about one inch too long. We were using prefabricated forms and don't think that much variation should have occurred. Are all prefabricated forms that bad? Read more

Problem Clinic Buggy Power

How much more production does a power cart deliver than a hand cart? Read more

Problem Clinic Smooth Rides for Your Grandchildren?

What can be done to make concrete pavements give a smooth ride for a longer time? Read more

Problem Clinic Concrete Counterweight Design

Counterweights for cranes must often fit a small volume. Sometimes a counterweight of concrete with a density of 150 pounds per cubic foot is not heavy enough. Is it possible to make concrete of various higher densities tailored to meet the volume require Read more

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