May 1992 Table of Contents

Problem Clinic Removing Keel Marks From Formed Surfaces

On an elevated deck job we're doing, ironworkers used black lumber crayons on the deck forms to mark the location of rebar. When we stripped the forms we found that the black marks had transferred to the concrete surface on the underside of the deck. They Read more

Problem Clinic Why Did Algae Growth Skip One Span of a Bridge?

What causes the dark discoloration seen on many old concrete surfaces, particularly bridges? Read more

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