Aggregate and types of Aggregate's

AGGEREGATES

In this post we will study-

What is aggregate?

Source of aggregate?

Classification of aggregate?

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Classification of Aggregates according to source -

 Small pieces of stones

Artificial aggregate obtained from bricks

Watch video Concrete and Types of concrete

 Source of Aggregates

1. Naturally - Obtained from Rocks
2. Artificially - Obtained From Brick slag

Natural Aggregates

It is obtained from the following 

1. Igneous Rock

Ex.- Granite, Basalt, Trap, Dolerite

2. Sedimentary Rocks

Ex.- Lime Stone, Sand Stone, Chalk, Gypsum, Kankar

3. Metamorphick Rocks

ex- Quratzite, slate, marble

Watch video on Basic civil engineering | building materials and construction | Mohan Dangi: https://www.youtube.com/playlist?list=PLiYAH68F-CTDIg4A8aycsMiU6HdZpXBkT

Note- Aggregates obtained from  Igneous Rock  is of the best quality

Classification of a aggregates According to size-

Acc. Size Aggregates are Classified in 2 types-

1. Coarser Aggregates

2. Finer Aggregates

1. Coarser Aggregates - Aggregate  passed through 75mm sieve and retained on 4.75 mm Sieve is known as Coarser aggregate

2. Finer Aggregates - Aggregate passes through 4.75mm Sieve and retained on 0.150mm sieve is known as fine aggregate

Classification of a Aggregates According to surface texture -

1. Smooth surface
ex- Slate, marble, chert
2. Rough surface (Angular)
ex- sand stone, oilites
3. Glassy
Ex- Black flinsh
4. Honey Combed surface
Ex- Scoria, Pumile
5. Crystal Surface
Ex- Basalt, Dolerlite, Granite, Glassic

Weakest aggregate obtained from glassy surface stones

Classification of Aggregates According to Shape :-

According to shape Aggregates are classified as below -
1. Rounded particals
2. Angular or cubical particals
3. Elonginated particals
4. Flakiner particals

1. Rounded Particals -
  for Better Workability in concrete Rounded aggregate are used

2. Angular or cubical particals -for  higher strength concrete Angular or cubical Aggregate preffered

3. Elonginated Aggregate - if Aggregate length is more than
9/5 Mean Dimension of Aggregate the such aggregate is known as elonginated aggregate

Lenght are exceed : 1.8 x mean dimension of Agg.

4. Flakiness Aggregate : Aggregate thickness is less than 3/5 x mean dimension it is known as flakiness aggregate
[If thickness of agg are less than 0.60x mean dimesion]