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Aggregates-1

Aggregates
Aggregates
 Introduction
 Aggregates are the inert materials that are mixed in fixed proportion with cementing material to produce concrete 
  These act as fillers or volume increasing components on the one hand and are responsible for strength hardness and durability of the concrete on the other hand 
  Most of the aggregates used are naturally e or curing aggregates such as coarsed rock, gravel and coarse sand         
  Artificial and processed aggregates may be broken break or crushed air-cooled blast furnace slag 
  These aggregate are bound together by means of cement
Properties of good aggregates
Following are the desirable properties for requirement of a a good aggregates
  It should be chemically inert
  the aggregate should be sufficiently strong to withstand the stress developed due to the wheel loads of the traffic
  It should process is sufficient toughness two with stand impact and vibratory loads
  The aggregate should be responsibility hard to offer resistance to the actions of of abrasion and attrition
  It should be strong enough to wear compressive and normal tensile load in ordinary concrete
  It should process is sufficient hardness to resist scratching and abstraction in the set and hardened concrete
  The aggregate should be free from impurities, inorganic or organic in nature with can affect adversely on the quality of concrete
  The aggregate should be capable of producing an easily workable plastic mixture on combining with concrete, water and other aggregate
Use of aggregates
The various uses of aggregates are as follow
  Aggregates are generally used to make concrete
  The fine aggregates serve the purpose of filling all the open space in between the course particles and thus by decreasing the the velocity of the final mass its strength is considerably increased
  The function of the course aggregates is to act as the main load-bearing component of the concrete the nature of work decides the maximum size of the course aggregates
  For making light-weight concrete, blast furnace slag is very suitable aggregates
  Heavy congrats are specifically useful as a sales against x-ray and radiation in atomic power plants for such concrete high-density aggregates are used
  Lightweight aggregates are used for lightweight concrete switch are used in sound proofing and heat proofing
  Aggregates are used as road metal, ballast for railway sleepers etc

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