• E-Concrete

     
  • What's New

     
  • Fleet Factors

     
  • As the Drum Turns

     
  • On the Beach

     
  • A Tale of Two Concretes

     
  • Air Supply

     
  • A Caisson Problem

    I have a ready-mix customer who is supplying concrete for caissons. The mix design is an ordinary caisson mix (similar to CDOT Class BZ) designed for 6- to 8-inch slump placements. The caissons range from 30 to 60 inches in diameter and are 20 to 25 feet deep. They have not encountered any water...

     
  • Will this Design Work?

    I’m a mason working in an area devoid of building codes and cannot afford an engineer. I’m building a 16-foot diameter circular gazebo that will have a concrete floor. I will lay 12-inch half blocks side by side in a circle beginning 9 feet below grade and would like to use this space under the...

     
  • Eliminating Corrosion

    I recently read some papers on the corrosion of concrete in sewer manholes. Apparently, this is not a problem of gasses floating around in the sewer, but an issue of anaerobic bacteria (Thiobacillus) living on the surface of the concrete, creating sulfuric acid, which corrodes the concrete. The...