September 1993 Table of Contents

Features Denver's New International Airport

Scheduled to open in December 1993, Denver's new $2.7-billion International Airport will be the nation's second largest public works project. Read more

Features Isolation and Expansion Joints in Concrete Pavements

The purpose of isolation and expansion joints is to prevent damage from differential movements. Read more

Features Foundation Repair

A small percentage of foundations fail or become distressed, and the deficiency usually puts much more than the foundation at risk. Read more

Features Concrete Boom Trucks

Dependability is one of the hallmarks of modern boom trucks. They work hard and run long. Breakdowns are rare. In addition, they place concrete quickly and efficiently. Some pumps are capable of delivering more than 200 cubic yards of concrete per hour. Versatility is another attribute of today's boom trucks. Some models with five-part booms can reach up or out more than 200 feet. Read more

Features U.S. Tour of European Concrete Highways

During the summer of 1992, a group of 21 U.S. highway and pavement experts including contractors, engineers, and representatives of government and trade organizations observed the condition and construction of highways in western Europe. Called the U.S. Tour of European Concrete Highways (U.S. TECH), the group visited 5 countries and met with experts from 4 more to learn about portland-cement-concrete highway pavements in those countries. Read more

Features Students Paddle It Out in Concrete Canoe Competition

In June 1993, students gathered in Sacramento, Calif., to find out who had the best-designed and fastest concrete canoe. They represented 20 universities that had claimed regional championships and been invited to take part in the Sixth Annual American Society of Engineers National Concrete Canoe Competition. The contestants competed not only for bragging rights to the best and fastest boat, but also for $9,000 in scholarships offered by competition sponsor Master Builders Inc. Read more

Problem Clinic Old Reinforcing Bar Systems

Where can we find information on systems for reinforcing building slabs built in the 1930s, and earlier? Read more

Problem Clinic Patching With Black Concrete

We sometimes patch existing asphalt parking lots with concrete. On a couple projects, we sawcut the area to be patched, removed the bad material, and replaced it with air-entrained concrete. This seems to be economical. The one drawback is the patches are Read more

Problem Clinic Curing Lightweight-Concrete Test Cylinders

For the first time in years we have a job calling for lightweight concrete, but we haven't kept up-to-date on specifications for testing. The aggregate supplier told us to air dry the test cylinders after a seven-day moist cure. Is this correct? Read more

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