February 1995 Table of Contents

Features Handling Concrete on Small Pours

The method a contractor chooses for placing concrete can actually have more impact on a small project than on a larger job. Job conditions, site access, and cost considerations affect the choice of handling methods and equipment for most projects. But on small jobs, choosing the right placement technique can mean the difference between profit and loss on the job. Read more

Features Transporting Basement Wall Forms with Ease

Poured-wall contractors can increase form-handling speed and efficiency by using truck-mounted cranes to hoist form panels off the truck and form baskets to lower them directly into the basement excavation. By reducing the need to handle the forms manually, this equipment allows contractors to complete jobs sooner using less labor. It also reduces form wear and tear and backbreaking lifting. Read more

Features Vibrating Concrete in Wall Forms

Internal vibrators - also known as immersion, spud, or poker vibrators - are the type most commonly used to consolidate concrete in wall forms. External vibration usually is only needed to supplement internal vibration in reinforcement-congested areas. Read more

Features Alcatraz: Concrete on "The Rock"

Alcatraz, the infamous island prison located in the mouth of San Francisco Bay, is now a popular tourist attraction administered by the National Park Service. One of the major draws to this fascinating historical site is the reinforced-concrete cell house built more than 80 years ago. Designed as a solid fortress to prevent the escape of prisoners, the structure is now showing signs of serious deterioration. Read more

Problem Clinic Preventing Bugholes

On some recent small concrete wall jobs, we found small surface air voids, or bugholes, on the surfaces of the hardened concrete. Although the walls seem structurally sound, I'm concerned about their appearance. Is there anything I can do to prevent bugho Read more

Problem Clinic Protecting Shotcrete from Freezing

Because shotcrete usually has a higher cement content than normal concrete, do I have to protect shotcrete from freezing as long as for normal concrete? Read more

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