October 1995 Table of Contents

Features Selecting and Using Plywood Forming Panels

Contractors typically need to evaluate structural wood forming panels to properly construct job-built forms and use prefabricated forming systems. Versatile and economical, job-built forms can be used for projects ranging from small residential walls to large domed structures. And because of the efficiency of mass production, prefabricated plywood forming systems such as ganged forms, slipforms, jump forms, and flying truss systems can be used to save material and labor costs. Read more

Features Advances in Vertical Slipform Construction

If construction speed is a priority when you build a tall concrete structure, slipforming may be the answer. Slipforming differs from conventional concrete forming because the forming panels move semicontinuously in relation to the concrete surface being formed and form ties are not used. Read more

Features Forming System Speeds Elevated-Slab Construction

A unique hand-set, aluminum slab-forming system designed for quick, safe installation and removal recently helped concrete formwork subcontractor Ceco Concrete Construction Corp., Kent, Wash., meet a tight eight-week schedule for construction of about 300,000 square feet of elevated office building slabs. Read more

Features Taking Concrete to the Outer Limits

On September 30, 1994, the space shuttle Endeavour roared off the launch pad carrying the world's first portland-cement-based- mortar experiment into space. The results of this important experiment, conducted by researchers at Master Builders Inc., Cleveland, and students from the University of Alabama, Huntsville, may help shape the future of concrete technology. Read more

Features Choosing Supports for Welded Wire Reinforcement

Welded wire reinforcement (WWR) is primarily used in slabs on grade to control cracking caused by shrinkage, thermal stresses, and other effects as well as to control crack width. Heavier styles of WWR can even be used as structural reinforcement in a slab. Read more

Problem Clinic Air-Content Specifications for Exterior Flatwork

Presently, our specifications for exterior flatwork call for a compressive strength of 3500 psi with 4% (±1%) entrained air. Read more

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