Construction

Specification of Coarse Aggregate


Coarse Aggregate

Coarse Aggregate consists of natural occurring stones (crushed, uncrushed or broken). It should be hard, strong, dense, durable, and clean. It must be free from veins, adherent coatings and injurious amounts of disintegrated pieces, alkali, vegetable matter and other deleterious substances. It should be roughly cubical in shape. Flaky pieces should be avoided. It should confirm to IS: 2383(I).

Grading of coarse aggregate


Coarse Aggregate should be either graded or single sized as specified in the table given below.

Characteristics of coarse aggregate

1. The coarse aggregate is clean, hard, non porous, free from lumps of clay and vegetable matter.
2. Water absorption of aggregate is not more than 10 % of its weight after 24 hours immersion in water.
3. Angular and roughly cubicle particles are ideal. River gravels make the best coarse aggregate.
4. Aggregate is chemically inert material.
5. Brick aggregate is not used in RCC work. 





S. No.   IS Sieve size of Designation(mm)

 Percentage   

40mm      

passing

20mm       

(by weight)    

16mm     

 for nominal 

12.5mm   

 1.   75   100  ----    ----     ----   
 2.     37.5   95-100          100           ----     ----     
 3.    19       33 - 70        95-100    100     ----       
 4.     16   ----               ----    95 - 100         100
 5.   11.2       ----           ----  ----     90 -100
 6.    9.5        10 - 35     25 -35      30 - 70        40 -85 
 7.     4.75    0-5     0-10      0-10          0 - 10

Deleterious substances in coarse aggregate

Coarse Aggregate should not contain any of the following deleterious materials.  
  •  Pyrites
  •  Coal
  •  Lignite
  •  Mica
  •  Clay
  •  Alkali
  •  Soft fragments
  •  Sea shells
  •  Shale or similar laminated material
    NOTE: The maximum quantity of deleterious materials should not be more than 5% of the weight of the aggregate when determined in accordance with IS: 2386(I).


Precautions while using coarse aggregate

The following precautions should be taken while using coarse aggregate in RCC (Reinforced Cement Concrete) Work.
 
1. Aggregate should be stacked on a hard, dry and level patch of ground.  
2. Coarse aggregate should not contain any material liable to attack steel reinforcement.
3. Aggregate which are chemically reactive with alkalies of cement should not be used.   
4. Proper graded material should be used for achieving good bond stress.
5. Aggregate should be washed with clean water before the use. 
 

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Coarse Aggregate
Coarse Aggregate
Coarse Aggregate
Coarse Aggregate
Coarse Sand
Coarse Sand

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