June 1980 Table of Contents

New Expansion Joint for Plastered Walls

The need for expansion joints is created by movement of materials as they shrink and swell from cyclic changes in moisture and temperature. Read more

An Energy-Efficient Precast Wall System

A funny thing happened to Jesse Savell Jr. on the way to developing a better precast concrete wall system. Read more

Insulated Concrete Walls Built Without Forms

A new idea in composite walls with insulation values reportedly attainable up to R-19 is being used to build homes and other structures at considerable savings. Read more

A Monument to a Cherished Tradition

Creative uses of both cast-in-place and precast concrete have played a prominent role in constructing the Kentucky Horse Park in Lexington, Kentucky. Read more

Control Joints Can Eliminate Leaking Cracks in Basement Walls

A poured wall contracting firm of Mason, Michigan has been installing control joints with water stops it its walls for the past ten years. Read more

A Simple, Efficient Insulation System for Poured Concrete Walls

A new type of curved insulation panel system provides architects, builders and developers with a practical, cost-cutting product for the wall insulation market. Read more

Leave-in-Place Forms for Wall Insulation

A new system of leave-in-place forms incorporates lightweight insulating panels of expanded polystyrene that: fit together with tongue-and-groove joints that contribute to alignment; provide an added thermal resistance of R16 without requiring a separate construction operation to install the insulation; are held in position with plastic ties to avoid thermal short circuits; are stiff enough to withstand the pressure of a 32-inch lift of 4- to 5-inch-slump concrete; and provide anchorage, through plates on the snap ties, for attaching wall finishing. Read more

Stop the Presses?

Stop the presses? No at least not when additions are made to a tilt-up building. Read more

Problem Clinic Hand Rubbing and Weather Protection

After the forms have been removed does hand rubbing the surface actually improve the weather resistance of the concrete? Are there other methods that will provide the same amount of protection? Read more

Problem Clinic Take Care With Oversize Crane on Tilt-Up

We have been cautioned against using too large a crane on a tilt-up job. What is the disadvantage and what harm could it do? Read more

Problem Clinic Calcium Chloride Likely to Corrode Metal Deck

Through an error, 1 percent calcium chloride was added to a 3000-psi concrete mix which was used for a slab over a galvanized metal deck. Is the calcium chloride detrimental to the concrete or the deck? Read more

Problem Clinic Formwork Pressure Calculations

American Concrete Institute formulas for lateral pressure of concrete (ACI 347-78, Section 2.2) show that pressure is inversely related to the temperature of the concrete in the forms. However, the temperature of the concrete is rarely (if ever) monitored in the forms. Read more

Problem Clinic Contractor Name Imprinting Tools

We've been scouring your Product Progress pages looking for a tool we require but without success. We need a concrete stamping tool to imprint sidewalks and other flat work with our company name and the year. Read more

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