February 1996 Table of Contents

Features Cable Stays Keep Bridge Formwork Above Water

Before tackling construction of the 180-foot-span Presumpscot River Bridge in Falmouth, Maine, general contractor Cianbro Corp. realized it couldn't complete the job on schedule using conventional falsework to support forms for the structure's cast-in-place spandrel arch ribs. Read more

Features Tips for Reconstructing Concrete Intersections

Intersections represent a special challenge in concrete pavement construction. Having to accommodate traffic flow while striving to meet project specifications for drainage, smoothness, and other structural requirements tests a contractor's construction and organizational skills. Read more

Features Lining the Calumet Tunnel

Completed in September 1995, the $194.5 million Calumet Tunnel in south suburban Chicago represents public-works construction at its best. Read more

Features Stop Water in Its Tracks

Waterstops play a crucial role in concrete construction, preventing seepage of water or other liquids through construction, contraction, and expansion joints. Read more

Features Using the F-Number System to Manage Floor Installations

Presented here are sample specification excerpts that show contractors and specifiers how F-number requirements are typically addressed in project specifications for random-traffic floors. Read more

Features Slipform Paver Rises to the Occasion

Well before the first winning athlete is acknowledged at the 1996 Summer Olympics in Atlanta, a construction team building a public stadium for the much-anticipated event has put in a performance worthy of a gold medal. Read more

Features Concrete Super Bowl '95

Dubbed "Concrete Super Bowl 95" by its construction team, an incredible 31-day building effort last summer resulted in the placement of 600,108 square feet of concrete slabs--enough concrete to cover nearly 13 football fields. Read more

Problem Clinic Preventing Lignite From Floating to Slab Surfaces

We're having a problem with lignite (coal) in the sand we use to make concrete. There's no cost-effective way to remove it, and it floats to the surface in concrete slabs. Read more

Problem Clinic Permissible Levels of Chlorides and Sulfates in Aggregate

We're designing a concrete structure in Egypt, and I received test results for the aggregate to be used in the concrete. Read more

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