November 1989 Table of Contents

Features Self-Lifting Forms

Self-lifting forms offer a way to expedite construction of columns, spandrels, shear walls, and core walls of high-rise buildings. Read more

Features Building Concrete Slabs Composite with Steel Frames

Many concrete contractors have worked on older-style (pre-1980) steel-frame buildings that had enough strength to support all the loads from deck forming and pouring operations without anything else to brace or hold them. Currently designed frames frequently lack that strength in the steel members and only achieve adequate design strength when the fully cured concrete is in place. Read more

Features Concrete Sludge-Holding Tanks Repaired with Shotcrete and Two Colors of Epoxy Coating

A scheduled inspection showed that two 8-year-old concrete sludge-holding tanks at the Hopewell, Virginia, wastewater facility were being attacked by hydrogen sulfide fumes. Read more

Features Countering Alkali-Silica Reaction in Concrete

Before 1976, no concrete aggregates in the United Kingdom were thought to react harmfully with alkalies. But that year researchers found that some structures had indeed cracked because of an alkali-silica reaction (ASR). Most of the affected members are exposed to groundwater, rain, or heavy condensation and the concrete generally contained more than 760 pounds of cement per cubic yard. Read more

Features Coordinating Formwork Plans with Overall Project Planning

The concrete forming plan and selection of form handling equipment can have serious consequences for other trades and operations, including both subcontractors and the general contractor. Read more

Features Party Tents Make Good Enclosures for Winter Concreting

In Glenview, Illinois, a home builder used a party tent for cold weather concreting of a townhouse development. Read more

Features Form Ties, Common and Uncommon

Commercially available form ties have safe tension load ratings of 1,000 to 50,000 pounds or more. Read more

Features Growing Up Alongside Your Construction Firm

The only real difference between the continuing successful construction companies and the early failures is management skill. It's staggering how many contractors have enjoyed years of success only to fail because they let their companies get larger than they could effectively manage. Management skill is more than supervisory skills. It includes a certain amount of vision so that planning for the future can take place. Read more

Features Construction Claims: How to Keep Them from Degenerating into Disputes

In many instances, the claim process has become impersonal, formal, and complex. But it doesn't have to be. If you are entitled to collect for extras and you stick to the basics, keeping the claim simple, you have a good chance to collect the amount due without going to war--even in today's litigious atmosphere. Read more

Problem Clinic Painting Concrete in Bright Colors

Where can we get a deeply colored paint for concrete, one that is highly saturated with primary color? We need it for a multiuse building 600 feet tall. The owner wants several bright colors, not the stains, pastels, and earth tones commonly used on concr Read more

Problem Clinic Protecting Concrete Exposed to Hydrofluoric Acid

We re replacing concrete floors, pads, and pedestals damaged by hydrofluoric acid spills in an oil fuel processing plant. The acid is at ambient temperature and concentration varies from 10% to 60%. How do we protect the new concrete so it doesn't deterio Read more

Problem Clinic Floor Isn't Flat Enough for Racquetball Courts

We placed the concrete for post-tensioned decks for a three-story health club. Read more

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