March 1988 Table of Contents

Features Worker Safety in Formwork Operations

Major categories of accidents in forming and shoring activities are: falling from one level to another; being hit by falling objects; improper lifting practices. Read more

Features Cracks in Structures

Every building constructed using concrete in any shape or form has cracks. It is the size, frequency, and reason for their existence that matters, not that they happen to occur. Read more

Features New System Casts Footings After Erecting Wall Panels

One, two, three. Dig a trench. Erect the precast wall panels in the trench. Then fill the trench with concrete. Read more

Features Recycling Concrete Pavements

Breaking up an old concrete pavement and reusing it as aggregate is a cost-effective option for reconstructing deteriorated pavements. Recycling eliminates disposal problems and tipping fees. In urban areas where landfill space is scarce, dumping concrete is difficult and costly. The cost of recycling concrete pavements only includes the cost of crushing. Costs for aggregate hauling and concrete disposal are eliminated. Read more

Features Improved Cathodic Protection System

Cathodic protection (CP) stops corrosion and eliminates the need for periodic patching or deck replacement. Improved materials and methods have reduced costs and simplified installation of CP systems. Read more

Features Wet Shotcreting Machine Gives Nozzleman Total Control

Wet-mix shotcrete is more commonly used for high-production shotcreting applications than for repair jobs. But a Chicago-area contractor has designed and produced a wet method shotcrete machine specifically for repair work. Read more

Features Resistance of High-Strength Concrete to Freezing and Thawing

Two developments have made possible the new generation of high-strength concrete now available for routine construction: superplasticizers, and silica fume. Read more

Features Saw Cuts Concrete Immediately After Finishing

Joints should be sawed in concrete slabs before drying or cooling causes random cracking. Read more

Features Can Concrete Fly?

Sure, concrete can fly--with the help of a helicopter, a fearless pilot, and an experienced ground crew. Read more

Problem Clinic Tilt-Up Uses Trompe L'Oeil

What does a French term like trompe l'oeil have to do with concrete? I've seen it several times recently. And also how do you pronounce it? Read more

Problem Clinic Cracks in the Curing Membrane

We completed a floor pour and were surprised to find fine pattern cracks in the surface the next day. The mix wasn't particularly rich, with a cement content of 550 pounds per cubic yard. We carefully limited slump to 3 inches and didn't overtrowel the su Read more

Problem Clinic Rained-On Slab May Not Require Repair

We finished an air-entrained concrete ramp at a truck loading dock and left it uncovered late one evening. It rained shortly afterward and surface mortar was washed off. We didn't try to refinish the surface then. What can be done to repair it now? Read more

Problem Clinic Source for Predrilled, Unframed Plywood Form Panels

An article on residential concrete formwork in your November 1985 issue (page 921) shows predrilled, unframed plywood panels. Read more

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