February 2004 Table of Contents

Features Project of the Month: Egyptian Ambition

Egypt today has much poverty, and its population is crowded into a narrow strip adjacent to the Nile, with the remaining 95% of the country a vast desert. As the population increases, the small amount of arable land near the river is being converted to living space, a conundrum that makes it increasingly difficult for Egypt to feed its people. To address this, an aggressive program is underway to develop industrial areas and irrigated desert outside of the traditional living areas. Two projects designed by Cairo-based Hamza Associates that are part of this effort are the Al-Sokhna Port near the Suez Canal on the Red Sea, and the South Valley Development Project near Toshka in southern Egypt. Read more

Features Florida's Concrete Kingdom

The solution for future transportation problems in larger metropolitan areas, believes Linda Figg, president of Figg Engineering Group, Tallahassee, Fla., rests with the Lee Roy Selmon Crosstown Expressway, now being constructed by the Tampa Hillsborough Expressway Authority in Tampa, Fla. It’s a 5-mile-long bridge being constructed in the median of the existing tollway; it will add three reversible lanes for traffic going into and out of Tampa each day. The bridge will reach as high as 70 feet, providing great views of the city. And, best of all, it’s all concrete! Read more

Features Are We Placing Too Much Air in Our Concrete?

Adding microscopic air bubbles to concrete in order to increase its resistance to freeze/thaw cycles was one of those fortunate accidents. Read more

Features Working Together for Better Concrete Floors

Concrete flatwork makes up a large part of the concrete construction industry. Advances in placement and finishing equipment, as well as in mix design, have enabled contractors today to build better slabs than ever before. And yet problems continue to occur. Chief among these are cracking and curling of the concrete, and moisture issues that cause floor coverings to delaminate. Read more

Features The Many Faces of Overlaid Plywood Form Panels

This article will provide you with information to help you make better decisions by answering many questions regarding overlaid forming panels. It will also help you to know what questions to ask so you make sure the right panel is on the job. Read more

Features The Future of MasterFormat

Many of the biggest changes in the new MasterFormat will be in areas seriously underserved in previous editions: telecommunications, integrated building systems, audio-visual, security, public works, and process engineering, among others. Read more

Features Finding the Right Waterproofing System

Seventy years after its 1933 debut as a state-of-the-art facility, Kansas City, Missouri’s Nelson-Atkins Museum of Art is receiving a face-lift of gigantic proportions. This major campus-enhancement project includes significant renovations to the existing building, a new parking structure, and a new building that adds 160,000 square feet of space for galleries and offices. With 25,500 cubic yards of concrete poured for the project, a key concern for the owners was ensuring protection of the museum’s treasures for generations to come. This led to the decision that waterproofing would be a key component. Read more

Features F-numbers for a Floor Test Section

Sponsored by Concrete Construction, a limited study was undertaken to measure F-numbers on a test section of a floor with three different measuring devices. Read more

Residential Concrete Casting Residential Foundation Walls in Cold Weather

Cold weather concrete technology is founded largely on the premise that concrete freezes early as the temperature declines, and that once frozen, concrete will no longer gain strength. The concrete industry, and particularly the residential wall industry, has seen its share of contractors who “soup” up mixes by adding excessive water onsite to every truckload, making it easier to work with—at least easier on the worker’s back. This misuse of water is one primary reason for misconceptions about cold-weather concreting and is also responsible for code requirements that are far too restrictive, despite evidence for less restrictive measures. As a result, building officials and inspectors routinely shut down foundation projects because they don’t know what is really important. Read more

Decorative Concrete Concrete Countertops; Reinforcing and Concrete Mixes

As simple as the idea of casting a concrete countertop may seem, there are significant problems in designing reinforcement to eliminate cracking and in developing a concrete mix to minimize shrinkage and porosity. Read more

Problem Clinic Air Test Variability

Is it common to get different air readings when using a pressure meter and a roll-a-meter or volumetric meter? I continually get a difference of about 0.8% to 1%, but I feel very sure my meters are calibrated correctly. The higher reading is from the pres Read more

Problem Clinic What Caused Non-Bonding?

I have a customer who tore out a slab that had delamination problems. He subsequently found some sections where the #4 bar had not bonded to the concrete at all. Naturally he is assuming the concrete is "bad." Besides oil and rust, what other reasons can Read more

Problem Clinic Concrete Too Salty?

Does the water for concrete have to be completely void of salt (from seawater)? What happens if it is not? Read more

Problem Clinic Concrete For a Pond

About 5 years ago I built my first pond. It measured 5x8 feet and was about 2 feet deep. I just dug a hole with outward sloping sides and used bagged posthole-type cement from Home Depot. I made it 2 1/2 inches thick, with a little chicken wire, and have Read more

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