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Caltrans and industry work together to improve Section 39

Author: Mike Cook Posted by Mike Cook on Tue, March 1st, 2016, 11:21 am

Over the past few years, Caltrans has worked on a major overhaul of theSection 39 specificationfor producing and placing hot mix asphalt on state roads.The idea behind the change was to bring California more in line with national asphalt standards and to produce more consistent and accurate test results.But when the new Section 39 changes first showed up in paving contracts, it quickly became apparent that some aspects of the new specification were not truly “street ... Read More

Operation McDonalds

Author: Mike Cook Posted by Mike Cook on Tue, March 31st, 2015, 3:23 pm

The challenge to deliver the same product every timeIf you have gone to McDonalds once, chances are you’ve been there many times. McDonalds prides itself in delivering the same flavorful experience with every visit. Whether it’s a Big Mac, McNuggets or a cup of coffee, McDonalds knows if they do it right and the same way each time, you’ll be back.Graniterock customers are no different. They expect our rock products, concrete and asphalt to be consistent ... Read More

Major Changes in Hot Mix Asphalt: Caltrans Adds More "Superpave" Concepts to Improve Performance

Author: Mike Cook Posted by Mike Cook on Wed, March 18th, 2015, 8:16 am

In recent years the California Hot Mix Asphalt (HMA) industry has seen major changes in technology and state specifications.Warm mix asphalt, recycled asphalt pavement and anti-stripping agents have already been implemented, and the use of intelligent compaction and asphalt shingles are hitting the street soon. Further changes in specifications include a new binder grading system (PG grades), a shift in responsibility for quality control from owner to contractor (QC/QA) and tighter tolerances for materials used in ... Read More

A Good RAP: Reclaimed Asphalt Pavement

Author: Mike Cook Posted by Mike Cook on Wed, March 18th, 2015, 8:16 am

Reclaimed Asphalt Pavement (RAP) can be used as an aggregate and partial oil replacement in the hot recycling of asphalt paving mixtures. The most common method (conventional recycled hot mix) involves a process in which RAP is combined with virgin aggregate and new asphalt cement in a central mixing plant to produce new hot mix paving mixtures.Although some form of pavement recycling had been practiced as early as 1915, the first sustained efforts to recover and ... Read More

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