Aggregate Terminology

The terminology used to describe aggregates throughout the United States is not consistent.  It seems to vary most from region to region, but can also vary within regions, within types of organizations, and even within companies.  The terms that tend to cause the most confusion are “Rock” and “Gravel”.

ROCK
Gravel Products uses the word “Rock” to refer to various products that have had all (or nearly all) of the sand and clay removed.

GRAVEL
Gravel Products uses the word "Gravel" to refer to various products that contain a mixture of rock, sand and clay.          

CRUSHED GRAVEL v. SCREENED GRAVEL              

  • Crushed gravel typically contains slightly more rock and slightly less clay.
  • Screened gravel typically contains slightly less rock and slightly more clay.
  • Crushed gravel contains fractured particles that were mechanically produced (crushed) as well as fractured particles that were produced by the forces of nature.
  • Screened gravel contains fractured particles that were produced by the forces of nature.            
  • Gravel Products considers crushed gravel to be a superior product.        

               
CLASS 5 v. CLASS 13        

  • When processed gravel meets the North Dakota Department of Transportation specifications for Aggregate Base Class 5, it can accurately be referred to as "NDDOT Class 5".
  • When processed gravel meets the North Dakota Department of Transportation specifications for Aggregate Surface Class 13, it can accurately be referred to as "NDDOT Class 13".
  • Most of our processed gravel meets both NDDOT Class 5 and NDDOT Class 13 specifications.      

               
COMPACTION GRAVEL 
The percent of fractured particles, the distribution of particle sizes, the amount of and physical properties of the clay, the moisture content, and other characteristics all contribute to compaction.

  • Both crushed gravel & screened gravel compact well.
  • Usually, a little more effort is required to achieve good compaction with crushed gravel.
  • Gravel Products believes that the additional compaction effort is worthwhile.
  • Gravel Products recommends crushed gravel when customers ask for "compaction gravel".       

 

Click on the following link for more detailed information about NDDOT specifications.
http://www.dot.nd.gov/dotnet/supplspecs/StandardSpecs.aspx

 




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