 Aggregate is produced in or near most cities and towns in South Africa. Annual per capita consumption of aggregate is about 2 000kg per capita in SA. and 10 000kgs in the United States.
Industrial sand and gravels are used for purposes such as foundry operations, glass manufacturing, abrasives and filtration beds of water-treatment facilities, as a source of calcium in fertilisers, as a metallurgic fluxstone, as filtration systems.
Aggregates make up 70 to 80 percent of the volume of concrete and aggregates used in asphalt mixtures (roadways – hot mix asphalt, cold mix asphalt, surface treatments) comprise approximately 95 percent of the mix mass. Thus, all roads, sidewalks, buildings, structures and anything made from concrete require aggregate.
Aggregate include crushed stone, sand and gravel and are the most abundant natural resource available. Used as a primary raw material component in construction, agriculture and other chemical and metallurgical industries. Since the value of aggregate is low and the weight of the product is high, the cost of transportation becomes a primary factor in the consumer cost. Aggregates uses are a major contributor to and a key indicator of the economy in any region.
Aggregates are produced for a number of reasons:
Concrete aggregates
Road base and coverings and road stabilisation
Asphaltic concrete aggregates and other bituminious mixtures
Construction fill
Concrete products, such as blocks, bricks, pipes, etc.
Plaster and gunite sands
Railroad ballast
Roofing granules
Filtration
Other miscellaneous uses
Various definitions for aggregates?
Aggregate: A mixture of sand and stone and a major component of concrete.
Aggregate: Crushed stone, gravel, sand or other material added to cement to make concrete mortar.
Concrete: Concrete is very durable and strong and since it starts as a liquid, concrete can be formed into almost any shape.
Aggregate: (also referred to as ballast) is used for concrete and consists of various sized particles from fine grains of sand to small stones.
Aggregate: A course material, such a gravel, broken stone or sand, with which cement and water are mixed to form concrete. Crushed stone is usually designated as course aggregate and sand as fine aggregate.
Aggregate: A surfacing or ballast for a roof system. Aggregate can be rock, stone, crushed stone or slag, water-worn gravel, gushed lava rock or marble hips.
Aggregate: Stone gravel sand of different sizes to form the bulk to mixtures such as concrete plaster or asphalt or a macadam road. The major component of plaster, concrete, asphalt or tarmacadam. It is usually broken stones, slag, gravel or sand.
Aggregate: Crushed rock used as a top layer in some flat-roof applications.
Aggregate: (1) crushed stone, crushed slag, or water-worn gravel, used for surfacing a built-up roof; (2) any granular mineral material.
Aggregate: Crushed stone, slag or water-worn gravel that comes in a wide range of sizes that is used to surface Quilt-up roofs
Aggregate: Gravel (coarse) or sand (fine) used in concrete mixes.
Aggregate: Natural sands, gravels and crushed stone used for mixing with cementing materials in making mortars and concrete. Also can be added to paint for texture or non-slip flooring surface.
Aggregate: A mixture of sand and stone and a major component of concrete.
Aggregate: Crushed rock or stone.
Aggregate: Particles of inert material, usually stone, which is mixed with cement and water to form concrete or plaster.
An Aggregate system of hydroponics uses inert material, such as clay pebbles or foam chips to surround the roots and provide support to the plant,
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