More stories about Aggregates

  • Sticking With Quality

    A new adhesive system increases reveal quality without damaging casting beds.

  • In The Mix

    Join the Editors for bauma 2007

  • Mortar Aggregate Ratio

  • 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...

  • 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...

  • 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...

  • Too Little Cover

    We are continually running up against structural engineers who push the limits of the cover for rebar and post-tensioning cables for suspended slabs in concrete structures. We normally never like to work with rebar cover less than 1/4 inch above the aggregate size. We are finishing an underground...

  • Tips on exposed aggregate finishes

    A local contractor we supply is doing after some renovation work in an upscale area and has asked us about exposed aggregate. Specifically, he wants to know the best way to install the exposed aggregate finish and if there are durability and maintenance issues to be concerned about. What can we can...

  • 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...

  • 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.