Other Articles

  • 2000 Pavement Awards

    Concrete paving contractors are placing more and more overlays--a repair option once dominated by the asphalt paving industry. Of the record 26 winners and finalists in 12 categories in the 2000 National Awards Program for Excellence in Concrete Pavement, more than one-fourth of the projects...

  • Move Over, Round Dowels

    Steel dowels, when aligned carefully and debonded from the concrete, help to carry loads across joints in concrete slabs even after the joints have opened too much to prevent load transfer by aggregate interlock. However, traditional round dowels may cause slab cracking by restraining movement...

  • Concrete Streets for Navajo Nation

    Late in the fall of 1999, Ft. Defiance, Ariz., became the first town in Navajo Nation to replace potholed asphalt streets with concrete. The project was so successful that several other towns in the reservation are following Ft. Defiance's example. Navajo Nation is the largest Indian reservation in...

  • Concrete Pump Attaches to Loaders

    The skid-steer loader is one the workhorses of the concrete construction industry--especially on small jobs. It can maneuver in tight spaces, excavate for slabs on grade, place and fine grade stone subgrade, and haul loads over rough terrain. More recently, it has become a tool carrier for various...

  • Are You Ready for 2001?

    If you are like most contractors, you are probably sprinting to get jobs completed by the end of the year, eager to get expenditures fulfilled and "off the books." But what about next year? Have you set aside time to plan ahead? Unfortunately, many contractors miss out on the opportunity to plan...

  • Do Pan Floats Cause Blisters or Delaminations?

    Pan floating significantly increases floor flatness and improves finishing productivity, but can it also cause floor imperfections?

  • Troubleshooting: Honeycomb and Voids

    Honeycomb forms when mortar fails to fill voids between coarse-aggregate particles. The defect may be purely cosmetic or, depending on the location and extent of honeycombing, may be structural and require repair. Voids form when concrete fails to fill areas in a form, typically those under large...



Other Articles

  • Coloring Concrete Integrally

    Integral color--achieved by adding pigments to concrete before placement--is the most common method for coloring concrete. But successfully installing colored concrete requires that you understand and learn how to manage the problems that can arise. The concrete mix design, weather conditions, and...



  • Vertical Rebar Placement in Footings

    When placing vertical rebar in a residential footing, is it necessary to tie them in place before the concrete pour, or can workers just "stab" them in after the concrete has been placed and struck off?

  • Epoxy-Terrazzo Problem

    An epoxy-terrazzo coating on a concrete floor we placed is beginning to blister in two locations. The concrete was placed on a 4-inch-thick granular subbase over a 6-mil vapor barrier placed directly on the subgrade. Do you know of anyone who has tried us

  • Does Aggregate Size Affect Concrete Shrinkage?

    I've heard that pea-gravel concrete shrinks more than concrete made with a larger maximum-size coarse aggregate. Why?