Abstract
Research work and field experience show that in Iceland aggregate properties and petrography are usually closely related. All rocks are volcanic, and the main types are basalt, rhyolite and hyaloclastite (consolidated tuffs). Unaltered basalt has in most respects high qualities, but impact and abrasion strength, durability and other propertis diminish rapidly with increased alteration. Porosity has an influence on the wear of road surfaces, but in other relations, porous and fresh basalt lava is advisable. Rhyolite can cause damage in concrete by alkali-aggregate reaction, and overall, both rhyolite and hyaloclastite have worse properties than basalt.
Published Version
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