October 1988 Table of Contents

Features Curved Beams Precast on Site

A six-level cast-in-place parking structure caused some problems for a Maryland forming contractor. Read more

Features Shear Collars Save a Parking Garage Slab

During an inspection of the elevated deck for a 16-year-old parking garage, extensive cracking was found above all 14 interior columns. Read more

Features Trap Rock Aggregate for Floor Construction

Trap rock and other materials such as quartz, emery, and metallic aggregates are often used in dry shakes to improve floor wear resistance. Read more

Features Truck-Mounted Crane Cuts Forming Time in Half, Saves Workers' Backs

Buck Sweet, a poured wall contractor, makes wall forming and stripping as easy as possible for his crew. Read more

Features Concrete Bleeding

Bleeding isn't always bad. It lowers the water-cement ratio and densifies the concrete. But concrete that bleeds too fast or too long can cause a number of problems. Read more

Features Reduce Back Injuries by Lifting Correctly

Back injuries are costly. Workers pay the highest price, enduring pain and coping with disabling effects. Read more

Features Forming Impressions in an All-Concrete Bathroom

Almost everything in Mark Story's bathroom is cast-in-place concrete, including the walls, ceiling, floor, skylight well, tub, shower, and shelves. Read more

Features Interpreting Test Reports: Look Above the Bottom Line

When you look at a concrete test report is your eye drawn immediately to the bottom line--cylinder strength? If so, you may miss valuable information. Read more

Problem Clinic What Do Compressive Strength Results on Cement Mill Test Reports Tell You?

A mill test report from a manufacturer of Type I cement gives compressive strength at 3 and 7 days. Can this information be used to determine how much cement is needed for a cubic yard of 3000-psi concrete? Read more

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