January 2000 Table of Contents

Features A Clear View of Sealers

Many surface-protection options are available to prevent water from entering concrete. Waterproofing coatings or membranes can provide a complete barrier to water, but their impermeability can be a drawback because they can trap within the concrete water that would otherwise evaporate. Read more

Features Are Moisture Tests on Target?

For contractors who place concrete floors that require coverings, the results of moisture-vapor emission tests can mean the difference between a project that remains on schedule and one that falls weeks behind. Consider the following scenario. Read more

Features Basement Wall Cracks: No Problem? Or Signs of Trouble?

Owners don't like cracks in concrete, and homeowners are particularly paranoid about cracks in basement walls. Read more

Features Troubleshooting: Blowup

Blowups are usually caused by compressive forces produced when concrete expands during hot weather. If the concrete is prevented from moving, the expansive forces cause vertical displacement of the slab at each side of the crack or joint. Read more

Features The Equipment Revolution

In the 1950s, paving 2,000 lineal feet of 24-foot-wide concrete pavement or placing and finishing 5,000 square feet of floor was considered a good day's work. Read more

Features Ten Ways to Speed Sales

When concrete contractors involved in residential or decorative work tell me they need more sales, my first question is: "What is your current cycle time for your sales process?" Most admit they don't know. Read more

Decorative Concrete Decorative Concrete: Travertine Finish

By applying a mortar or grout finish coat to new or old concrete flatwork, you can simulate the look of travertine. Read more

Problem Clinic Length of Protection Period in Cold Weather

We plan to place a 6-inch-thick slab on grade in cold weather and cover it with insulating blankets. How long after placement do we have to wait before removing the blankets? Read more

Problem Clinic Test Cylinders Always Needed?

We're building a concrete swimming pool in a rural area. For any placement using more than 5 cubic yards of concrete, the specifications require cylinders to be molded and tested for compressive strength. The closest testing lab is 100 miles away, so gett Read more

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