June 1989 Table of Contents

Features Forming Convention Center Fins

Forming 27,000 cubic yards of architectural concrete at the San Diego Convention Center provided a real challenge for architect, contractor, and form supplier. Although the job had its share of conventional walls, concrete decks, and pan slabs, it also had large amounts of complex, unconventional column, arch, and beam forming, for which the architect specified steel forms. Read more

Features Seal Cracks Carefully Before Injecting Epoxy Resin

Failing to cap a crack properly before injecting epoxy resin can cause a leak that wastes costly resin. Why do setups leak? Usually it's because of incorrect capping methods. Using the right method prevents leaks. Read more

Features Repairing Joints in Industrial Floors

Deteriorated joints are the most troublesome problem for plant engineers at warehouses. Four common joint problems were described in the August 1988 issue of Concrete Construction. This article shows how to solve those problems before owner occupancy. For successful repairs, keep the following principles in mind: Read more

Features Perimeter Channel Drain Solves Pool Deck Drainage Problem

Problems caused by poor drainage and a dirty slab surface for an indoor pool were corrected by placing a topping that sloped uniformly to a continuous channel drain. Read more

Features OSHA's New Rules for Crane-Suspended Personnel Platforms

In October 1988, the U.S. Occupational Safety and Health Administration (OSHA) issued a new standard to regulate the use of crane-suspended personnel work platforms. Read more

Features Why Some Contractors Succeed and Some Don't

We, as contractors, blame our failure to make profits on conditions over which we have no control. Actually, this is not the case. Management decisions alone determine success or failure in the construction business. Many contractors believe that quality construction and a few breaks should guarantee business success. They don't. Identifying the elements of past failures help achieve future success. Read more

Features How to Get Paid for Undisclosed Surprises on the Job

As a contractor, you know that jobs always have some surprises that may cost you money. You build that risk into your bids. But when a job is substantially changed from the one you bid, you can end up paying a lot more than your built-in risk factor. Sometimes you can recover that money by proving that the owner held back superior knowledge. Superior knowledge is information about a jobsite that was known by the owner but not told to the contractor--and that was essential to bidding and performing the job. Read more

Features Preventing Further Corrosion in Repaired Concrete

A sacrificial coating for rebar may be the solution for a perplexing concrete repair problem--recurrence of corrosion after the repair is made. Zinc-rich epoxy resin protects rebar in the repair zone and in surrounding concrete. The zinc coating allows electrical contact between the bar and the active zinc. Zinc then acts as a sacrificial anode, protecting the steel. Read more

Features Repair Widens Bridge and Preserves Original Charm

The Dublin Scioto Bridge near Columbus, Ohio, was built in 1935. The rib-arched concrete bridge with stone facing needed repair after 50 years of use. Read more

Features Formwork Becomes Art at National Building Museum

A recent installation by artist and journeyman carpenter Linda Wysong in the Great Hall of the National Building Museum, Washington, DC, involved some 40 workers and 50 tons of modular formwork. Read more

Features Using Tilt-Up for Salt Storage Saves Money

Road salt is usually stored in igloo-type wood-frame buildings that cost around $160,000 to build. In Kokomo, Indiana, though, the street department is using a building with tilt-up concrete walls to house road salt. Built last fall, the structure cost $105,000, including an 8-inch-thick concrete floor, and took only 60 days to construct. Read more

Problem Clinic Slab Form Removal in Multistory Work

We frequently are asked to strip slab formwork based on compressive strength, as determined by test cylinders, reaching 80% to 85 % of the 28-day specified compressive strength. Often we get this strength 3 days after placing the concrete. However, we not Read more

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