On the Face of It

This article, part of a special series on the chemistry of road building materials, discusses the chemistry of aggregates used in bituminous and portland cement concrete pavements. The physiochemistry of aggregates has a substantial effect on how liquid asphalt, cement/water and asphalt emulsions set, cure and perform. Several types of aggregates are available, including construction aggregates, premium aggregates, lightweight aggregates and even smart aggregates that incorporate nanotechnology for monitoring movement of stresses within concrete. Chemical composition, residual moisture, porosity, mixing heat and heat of hydration are all critical factors to consider when selecting aggregate. In asphalt pavements, the physiochemistry of aggregates and binders should be analyzed to select combinations that are most resistant to moisture damage and will perform best with other additives. In Portland cement concrete, minimizing the alkali-silica reaction that begins at the cement paste/aggregate interface is critical.


  • English

Media Info

  • Media Type: Print
  • Features: Illustrations; Photos;
  • Pagination: pp 16-17, 19, 21-25, 27
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 01445967
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 14 2012 11:14AM