January 1983 Table of Contents

Features Frame Shortening in High-Rise Concrete Buildings

Frame shortening in high-rise concrete buildings is a concern for both designer and builder, causing lost time and lost dollars. Read more

Features The Business of Repairing Concrete

Unlike new construction, repair and restoration work involves varied and unusual operations. Also, in many instances, neither the final design nor construction budget can be established before proceeding with at least some of the work. This is particularly true in major restoration where surprises almost always greet the contractors and designers once removals are commenced and the actual existing construction can be viewed. Read more

Features Old Silos Transformed into Luxurious Homes

Minneapolis' Calhoun Isles' stately, rounded condominium towers are actually 50-year old grain elevators converted into homes through renovation and new construction. Read more

Features Four Steps to Successful Concrete Repair

To participate in repair and rehabilitation successfully, the contractor must pay close attention to four basic steps in the repair process--evaluation of causes, extent, and consequences of deterioration; selection of repair material; preparation for repair; and placing of repair material. Read more

Features Bridge Rehabilitation with Cable-Stay Design

An Indianapolis' bridge over an Interstate Highway did not have the necessary clearance below its span for a proposed new two-lane entrance ramp. Built less than 10 years earlier, the existing structure was a four-span continuous variable depth concrete girder bridge that could still provide many years of service. Rather than replacing the entire bridge, the west span of the bridge was transformed into a cable-stay structure, extending it from 64 to 103 feet while leaving the east half of the bridge intact. Read more

Features Sculpture Protected Against Acid Rain

Acid rain is rainwater that has combined with automobile and smokestack emissions in the air to form sulfuric or sulfurous acid. Read more

Features Pavement Joints That Last 5 Years?

With good materials and strict procedures, warranties required by engineers and architects can be given on field-molded elastomeric joint sealants in Portland cement concrete highway and airport pavements. Read more

Features CPR (Concrete Pavement Restoration): the Band-Aid That Works

CPR offers a cost-effective, energy-efficient formula for maintaining an aging highway. CPR is recommended where much of the pavement slab remains in good condition with only limited areas of deterioration/loss of riding quality due to problems at joints and cracks. Read more

Features Grooving, Grinding, Cold Milling -- What's the Difference?

Grooving has significantly reduced accidents on pavements that exhibit a low co-efficient of friction or high accident rate. Signs installed on some sections of highway indicate that the highway surface has been grooved when it has, in fact, been cold milled by equipment using carbide-tipped teeth to cut the surface. Read more

Problem Clinic Popouts in New Concrete

In New York State we noted excessive popouts in the flat concrete work which was poured during the latter part of last year. At first we blamed the use of deicing salts. However, closer examination of the damaged portions revealed a piece of either flint Read more

Problem Clinic Some Articles Available as Reprints

Our field engineers are often asked for information on subjects that our own literature may not cover, or at least not in sufficient detail. In the past, we have found photocopies of articles from Concrete Construction to be very useful in answering quest Read more

Problem Clinic Heaving Floor in Basement

The concrete floor in my brother's basement has cracks along both sides and both ends, about 3 feet out from the walls. There are also some diagonal cracks running from these cracks to the corners. There aren't any other cracks in the floor. The floor als Read more

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