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. 
 

;
Sub standard material reduces the strength of RCC, Reinforced Cement Concrete, by 10 to 30 %. Use these steps to ensure the procurement of right quality material at right price
Kota stone flooring is a subtle blend of grandeur and luxury giving the interior and exterior a gorgeous look.......
To get maximum ventilation and natural light in your house, make sure the building is properly oriented. Orientation of building saves energy and provides comfortable living as well. This article tells you about various factors and benefits of building orientation.
Preview some of the most impressive pictures of kitchen from GharExpert Gallery.
A solid roof on building is very important for everybody living in the house. The roof should be constructed in a way that assures you great safety. Here are given details about different types of roofing.
Frames of doors and windows are most important parts of your doors and windows. They are available in different size, height, width and shapes. Frames hold locks and hinges and support door and windows to shut and open easily. Here is what you need to know about different doors and windows frames.
Different steel bars are recommended for their relative tensile stresses.Steel bars are major components of construction.Here is what you need to know about steel bars (Sariya).
Brahmasthan is a powerful zone of the house. It should have open space for flow of energy in the house. The positive energy is very useful for living beings of the occupants of the house.
Brick work is an important part of construction work done with the help of bricks and cement mortar. It is done with different quality of bricks with different ratios of cement mortar according to the requirement.
Are you remodeling your bathroom? Bathroom shower doors make your bathroom a style icon. Read the following article that will help you select the bathroom shower door that will exactly suit your bathroom.
Living room or Drawing room should be located in east or north direction. The ideal location of a living room depends on plot facing.
Without knowing perfect mixture of cement and sand you can not achieve your goal.
Manufacturing date, grade and type play vital role in purchasing right cement and there should be no lumps in it.
First Class Bricks must be homogeneous in texture without showing appreciable sign of efflorescence.
A coupler connects the two pipes to each other. If the material and size of the pipe are not the same,it is called a 'reducing coupler'.
Fine sand should consist of natural sand or crushed stone sand. It should be hard, durable, clean and be free from organic matter etc. and should not contain any appreciable amount of clay balls and harmful impurities such as alkalis, salts, coal, decayed vegetation etc.
Bricks provides several choices for quality. Select a type according to your need.
The beading is of plain variety with square edges.
Window Grills are required for the safety of homes. Window glasses should be well covered with grills. Here are various designs of grills which provide safety to window glasses.
Cracks can happen due to foundation movements and settlements of building, thermal movements, chemical reactions, elastic deformations and shrinkage etc. in buildings. They can damage plaster of walls, ceilings and destroy the beauty of the structure also. Let’s know their reasons in detail and get preventive measures.


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

Contact us About us
Copyright 2007- GharExpert.com All rights reserved.