September 2001 Table of Contents

Features Understanding Polymers in Concrete

Polymer-modified concrete is commonly used in many applications. You should know what polymers you are using and their strengths and weaknesses. Making the right choice could determine the success or failure of an installation—and the resultant liabilities. Read more

Features New Generation of Reinforcement for Transportation Infrastructure

Fiber-reinforced polymer (FRP), stainless steel, stainless-clad steel, and MMFX steel bars comprise the new generation of concrete reinforcing materials being used for durable construction. Their service life impressively surpasses traditional materials. Read more

Features Is Your Business Improving?

While financial statements are critical to managing a profitable company, other key measurements can also shed light on the operational and customer satisfaction improvements your business is making. This article examines one measurement that sheds light on operations, sales, and satisfaction—"customer callbacks." Read more

Features Will New Generation Reinforcing Materials Solve Our Corrosion Problems?

Deterioration of the nation's concrete bridges and transportation infrastructure has reached alarming levels. Bridge engineers and federal transportation officials have been using and experimenting with new reinforcing materials that provide corrosion protection not provided by traditional black steel rebar. We asked Gerardo G. Clemena, principal research scientist for the Virginia Transportation Research Council, and Doug Gremel, director of nonmetallic reinforcing with Hughes Brothers, to discuss the economic and structural pros and cons of FRP reinforcing, stainless steel, stainless-clad steel, and a new corrosion-resistant steel. Read more

Features Finishing Too Early

Troweling the surface of a slab while the concrete is still bleeding. Read more

Concrete Basics Preventing or Minimizing Slab Curling

Slab edges that curl upward and slab centers that are slightly depressed from their original elevation are common in suspended slabs and slabs on grade. This curling is caused by differential drying shrinkage and by moisture or temperature differences across the thickness of the slab. Read more

Problem Clinic What To Do About Popouts

Our garage floor has several popouts, some as large as a hand and 1/2 to 3/4 inch in depth. What causes them, and what is the best way to repair them? We live in Minnesota and thought the salt in the winter time was the culprit. Any information would be a Read more

Problem Clinic Misdirected FF numbers?

We recently placed a concrete floor with a laser screed. The floor had an FF requirement of 35 and an FL of 30. Read more

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