March 2001 Table of Contents

Features Coaching Employees to Be Champions

As the coach of a construction team, you should continually observe your "players"—at all skill levels and then do everything possible to motivate them. This article considers some coaching strategies. Read more

Features Document Your Performance with Daily Reports

Daily reports often contain the best clues as to how and where a project lost money. Read more

Features Draining the Water Away

In the Denver area, most claims against home builders are due to foundation problems. Contractors across the country face a similar dilemma. Read more

Features Resisting the Pressure

With most available modular wall forming systems offering pressure ratings no higher than 1650 psf, EFCO made news at World of Concrete 2001 when it introduced a new modular form system designed to handle 2400 psf lateral pressure. Read more

Features New Life for Harbor Towers

Soon after Harbor Towers in Boston was built in 1972, residents complained about water leaking into their units. Over the next several years, saltwater from winds coming off the sea penetrated the porous concrete and corroded the steel reinforcement. Carbonization reduced the alkalinity of the concrete surrounding the steel, making the condition even worse. The concrete began to crack and scale. Freeze/thaw action accelerated the process and made the building unsafe. The homeowners' association authorized $10 million to complete repairs. Read more

Features Concrete Perspectives

Although we don't actually want concrete to crack, we certainly expect it to, and all good designs plan for it. Indeed, the reinforcement in concrete doesn't even begin to work until it cracks. We even put in lines of weakness and beg the cracks to follow, which of course they sometimes don't. Read more

Features Troubleshooting: Low Cylinder Strength

Low compressive strength test results can be due to one of three things. This article discusses the three causes of low results and how to prevent these problems. Read more

Decorative Concrete Sandblasting Stenciled Patterns into Concrete

Sandblasted stenciling is one of the cutting-edge finishes in the decorative concrete market today, with possibilities for creativity as limitless as artistic minds can take them. The process involves sandblasting texture into a concrete surface through stencils, or masks, to create patterns, borders, and logos with dramatic effect. The most common types of stencils are logos, centerpiece medallions, and border patterns. Read more

Problem Clinic Effect of Concrete Strength and Slab Thickness on Floor Strength

The specification for the floor of a maintenance building called for a 6-inch slab thickness and concrete with a design compressive strength of 3000 psi. The actual average cylinder strength for the floor concrete was 3630 psi. Four months after the floor Read more

Problem Clinic Use Pad Caps When Testing Cores?

ASTM C 42-99, Standard Test Method for Obtaining and Testing Drilled Cores and Sawed Beams of Concrete, requires measuring the length of the capped specimen to the nearest 0.1 inch (2 mm) and using this length to compute the length-to-diameter ratio prior Read more

Problem Clinic Concrete Construction Information

I'm in a concrete apprenticeship-training program and would like any information you could send me about concrete construction. Read more

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