Gravel aggregates are aggregates acquired as the result of sifting quarried rock and by crushing natural stone rock. In strength, gravel aggregates are inferior to granite aggregates, but they also have their advantages: their radioactive background is usually very low and they are cheaper than granite aggregates.
Gravel aggregates are used for foundations and concretes and in products made of reinforced concrete and in road construction.
There are two types of gravel aggregates:
• Scabbled stone- – regular natural or crushed,
• Gravel – rounded pebbles usually of river or sea origin.
Fractions of gravel aggregates are as follows: 3-10 mm, 5-20 mm, 5-40 mm, 20-40 mm.