Concrete Technology

  • More Control for the Big Testing Labs?

     
  • Foundation Releases Updated Pervious Concrete Research Compilation

    Silver Spring, MD -June 26, 2008: The RMC Research and Education Foundation is proud to announce the release of the revised version of its Pervious Concrete Research Compilation.

     
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    Modern Moisture Testing

    Changes have occurred in testing floor dryness.

     
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    Integrating Technology

    Concrete producers, who long have used some computer programs in their back office and batching areas, are seeing the benefits of adding new programs and integrating their systems. Computer companies, meanwhile, are taking advantage of high-efficiency chips, larger memory capabilities, and wireless...

     
  • Testing for Bridge Deck Shrinkage

    Q: We plan to bid on some state bridge deck work planned in our area. Our district engineer is open to allowing a high-performance mix that will help mitigate the possibility of undue cracking. Our lab is analyzing several mixes with standard features such as strength, set time, and chloride...

     
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    Towering Achievement

    The 52-story Wachovia Corporate Center is the focal point of the new mixed-use Wachovia Cultural Campus, which will include a 42-story condominium tower, art museums, and 1200-seat performing arts theater. The two towers, along with a nine-story building annex, sit atop an eight-story parking...

     
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    Decorative Slab Core Samples

    We are involved in a dispute on the quality of a decorative slab for which we supplied concrete last fall. The project appears to be fine, but one set of test cylinders failed to meet compressive strength requirements.

     
  • Testing for Quality Block

    We recently supplied several split-face blocks for a large commercial project. The work continued for several months, and with about two weeks left, we started receiving complaints about the quality of the units from the mason contractor.

     
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    Putting Testing Technology to the Test

    Modern technology and automation have finally entered the concrete testing laboratory. Several technical committees have updated traditional standards to accommodate this new technology.

     
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    Strength Testing Woes

    Concrete strength testing is a much larger problem for ready-mix producers than many in the industry realize.

     
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    What's Worrying Your QC Manager?

    QC managers say testing labs often fail to follow correct procedures. The burden of proof of good performance falls to the producer.

     
  • Staying Connected

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

     
  • 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?

     
  • The Cost of Testing

     
  • Standardized Tests for SCC

    More of our customers are starting to ask us about the possibility of using self-consolidating concrete. What’s going on with the development of standardized tests for SCC?

     
  • Concrete Under Fire

    How thick should concrete be to withstand four hours of temperatures of 2000 degree F without degrading or failing? The concrete barrier likely will be exposed to more than 2000 degrees F. The barrier would be more than 30 feet tall and more than 30 feet long. It will be outdoors and subject to...

     
  • Testing Aggregates to Avoid Staining

    Is there a quick test to detect the presence of iron sulfide in aggregates? The aggregate I am considering will be used in an exposed decorative application, so repeated wetting and drying of the aggregate will occur at the surface. I also am concerned it may cause staining.

     
  • Compressive vs. Flexural Strength

    Is there a good way to correlate core compressive strength and flexural strength? I have a job in which there was only one beam broken, at 28 days, and there are not enough sets to perform any statistical analysis. We are planning to core the pavement and are looking for a comparison between the...

     
  • More on SCC

    Editor's note: Two readers responded to recent articles on self-consolidating concrete (SCC).

     
  • Relativity and Rheology

    Editor's note: Two readers responded to recent articles on self-consolidating concrete

     
 
 
 
 

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