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Fineness modulus of coarse aggregates represents the average size of the particles in the coarse aggregate by an index number. It is calculated by performing sieve analysis with standard sieves. The cumulative percentage retained on each sieve is added and subtracted by 100 gives the value of fine aggregate.

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Since 20 mm is commercially available, and we cannot use 40 mm for slabs below 200 mm thickness, we usually use 20 mm coarse aggregate in all the designs. If the max size of aggregate is greater than 1/5th of the least dimension, the chances of failure in shear are extremely high.

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Jul 07, 2014· For example 20 mm single size aggregate mean an aggregate most of which passes 20 mm IS sieve and its major portion is retained on 10 mm IS sieve. All in Aggregate. It is the aggregate composed of both fine aggregate and coarse aggregate. According to size Allinaggregate is described as allinaggregates of its nominal size, 40mm, 20mm etc.

### CHAPTER 4 AGGREGATES Civil Engineering Department

• The porosity of aggregate, its permeability, and absorption influence the bonding between aggregate and cement paste, the resistance of concrete to freezing and thawing and resistance to abrasion. • When all the pores in the aggregate are full it is said to be saturated. • If just the surface of aggregate …

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Depending on the mix design, either can be used to make essentially any range of concrete strengths. When you use a smaller aggregate, such as the 10mm as your nominal coarse aggregate size, the specific surface area of the total volume of coarse aggregate is much higher than for the 20mm aggregate.

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aggregate: [adjective] formed by the collection of units or particles into a body, mass, or amount : collective: such as. clustered in a dense mass or head. formed from several separate ovaries of a single flower. composed of mineral crystals of one or more kinds or of mineral rock fragments. taking all …

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Aggregates for Concrete bination of gravels or crushed stone with particles predominantly larger than 5 mm ( in.) and generally between mm and mm (3⁄ 8 in. and 11⁄ 2 in.). Some natural aggregate deposits, called pitrun gravel, consist of gravel and sand that can be readily used in concrete after minimal processing. Natural ...

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