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Highway Materials (aggregates)

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This article is about highway and transport engineering, this time we talk about the Highway Materials (aggregates)

The term aggregate refers to granular mineral particles that are widely used for highway bases, subbases, and backfill. Aggregates are also used in combination with a cementing material to form concretes for bases, subbases, wearing surfaces, and drainage structures. Sources of aggregates include natural deposits of sand and gravel, pulverized concrete and asphalt pavements, crushed stone, and blastfurnance slag.
pict source: www.cct-inc.net

Properties of aggregates
The most important properties of aggregates used for highway construction are:
  • particle size and gradation
  • hardness or resistance to wear
  • durability or resistance o weathering
  • specific gravity and adsorption
  • chemical stability
  • particle shape and surface texture
  • freedom from deleterious particles or substances


(source: Wright, P.H, with contributions by James S. Lai, Peter S.Parsonson, Michael Meyer., Highway Engineering, 6th edition ,John Wiley & Sons, Inc.New York, 1996.)


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