Problem Clinic

  • Stripping Product

    To avoid problems stripping product, be sure the form is in good conditon.

     
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    Controlling Shrinkage

    Many factors influence shrinking and curling of concrete floors.

     
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    Incompatibility Problems

     
  • Staying Connected

    ASTM C-1644-06 provides guidance on connectors between concrete wastewater tanks and pipes.

     
  • Spec Watch

     
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    Internal Concrete Curing

    There's a renewed interest in developing methods to incorporate internal curing as a tool to reduce cracking.

     
  • Spec Watch

     
  • Designating Blended Cements

    ASTM standard defines specifications for 'green' concrete mix design.

     
  • Spec Watch

     
  • Mortar Aggregate Ratio

     
  • Silica Fume's Advantages

    As a producer, I would like to learn more about adding silica fume to my mix. What are its effects and where can I get more information?

     
  • The Benefits of P2P Mixes

    Our county water department recently announced plans to build a new facility. This high-profile project would be the perfect opportunity to present the advantages of a performance-based mix design. What are some of the aspects we should focus on? How should we tout the benefits of performance-based...

     
  • Vacuum Drying

    Q. We are about to begin a large project that will require our technicians to take hourly field test samples of the fine materials. We’ve started to investigate alternatives to our normal oven-drying procedures. One method we recently discovered is vacuum drying. Do you know anything about this...

     
  • Measuring Compressive Strength

    Compressive strength is one of the most important measurements in manufacturing concrete. As a producer, I need to know whether this measurement is accurate. How can I be sure my concrete compressive strength results are correct?

     
  • English to Metric

    We recently won the bid to supply a large project. The good news is that there’s a large volume of concrete; the bad news is that the engineer has called for all of the measurements to be in metric. Converting our batching system to metric is a breeze, as the software supplier has provided an...

     
  • Preventing Sand Streaking

    We make precast septic tanks and often get water trails on the tank surfaces, even though we use admixtures. Is there a way to avoid these, or will they always have some trails?

     
  • Controlling Entrained Air Content

    We have started having problems with variations in air content of our air-entrained mix designs. Air content stays uniform for a while, then goes out of the specification range. Usually, measured air content is too low, but sometimes we get exceptionally high values. I know that many factors affect...

     
  • Lightening Hardened Concrete

    We’ve been asked to bid on an upcoming concrete bridge deck. The project requires a hardened concrete that will resist corrosion. Normally on jobs like this we recommend micro-silica. But in this case, there’s a catch. The bridge is part of a high-profile project that features decorative concrete...

     
  • Predicting Fresh Concrete Temperatures

    I am a concrete producer in the Upper Midwest and always must adjust my product for very hot weather conditions in the summer and cold temperatures in the winter. What advice do you have for producers like me who must figure how cool to make our aggregate in extreme weather conditions?To answer...

     
  • Looking for Certifiably Competent Persons

    I’ve heard that ACI may soon be offering a certification program for competency in concrete design. Does this have anything to do with NRMCA’s P2P and the move toward performance specifications? And what can you tell me about the certification program?

     
 
 
 
 
 

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