Depending on the source of aggregate it can be categorized into two types, namely natural aggregates, and manufactured aggregates. 1. Natural Aggregates

A test sieve that has been examined and certified by an authority for the purpose of complying with the specifications and tolerances of the applicable standard. Also, see Certified Sieve A test sieve that has been examined and certified by an authority, accredited for the purpose, as complying with the specifications and tolerances of the applicable standard. Also, see Verified Sieve The specific surface area of the fine aggregate is very much lesser than that of the coarse aggregate. 11. Deleterious Materials All About Coarse Aggregate: Definition, Types, Properties, and Classification 21They should not have the cover of organic materials, clay, and dust otherwise it will affect the bonding strength of concrete and aggregate.

The aggregates used in building construction must possess and fulfill the following requirement. The quality of concrete used for concrete making affect the grade of the concrete.Coarse aggregates are used in different ways in the construction industry. The aggregates are also used as ballast in road and railway works to resist the overall load, distribute the load properly to the soil base, and drain off the rainwater A group of sieves with a mathematically defined set of opening sizes, wire diameters, and tolerances Different industries often specify a certain sieve size or set of sieve sizes to define particular material types. Particle sizing determinations are not limited to these sieve sizes, but they provide boundaries to classify the materials. The two examples shown below are for mineral aggregates used for the production of asphalt and concrete mixes, and for soils used in geotechnical engineering applications.

Mineral aggregates for use in asphalt and concrete mixes are classified as coarse or fine. Coarse sieve sizes include sieves with openings larger than 4.75mm (No. 4), and fine sieve sizes are smaller than 4.75mm (No. 4), ranging down to 75µm (No. 200). The table below includes fine and coarse aggregate sieve sizes. The aggregates are mainly classified into three categories according to density. 1. Lightweight Aggregates All About Coarse Aggregate: Definition, Types, Properties, and Classification 18 Aggregate which has a size bigger than 4.75 mm or is retrained on a 4.75 mm IS Sieve is known asCoarse aggregate. Origin Of Aggregates Aggregates are used in the soil stabilization process using cementitious materials (blends of cement, fly ash, slag, and lime).A riddle may be square, rectangular or circular in shape, with a rim made from wood, metal, plastic or beechwood, holding in place a steel wire mesh that may either be handwoven or machine-made. A typical circular riddle is approximately 18 inches (46cm) in diameter and the mesh may have a spacing of something like 1 + 1⁄ 2 inches (3.8cm), 1 inch (2.5cm), 5⁄ 8 inch (1.6cm), 1⁄ 2 inch (1.3cm), or 3⁄ 8 inch (0.95cm). [2] Kinnally KW, Antonsson B (2007) A tale of two mitochondrial channels, MAC and PTP, in apoptosis. Apoptosis 12:857–868