Post on 21-Jan-2015
description
Submitted To:
Sir Shafiullah
Submitted by:
Huzaifa Shafiq (797)
Muhammad Abdullah Ijaz (798)
Afzaal Ahmad (850)
Numan Majeed (789)
Jamil Alam (801)
Umer Perveez (788)
Topic
Aggregates
Definition
Aggregate is a type of material used in construction, including sand, gravel, crushed tones etc.
Purpose of Aggregates
Strength Weight
Economically
Uses Of Aggregates
Concrete
Roads
Railway
Types Of Aggregates
Classification according to formationClassification according to size
Classification according to formatting
Natural AggregatesArtificial Aggregates
Natural Aggregates
Natural aggregates consists of rock
fragments that areUsed in their natural
state, or are used after mechanical
Processing such as crushing, washing, and
sizing.
Artificial Aggregates
For making special type of concrete we should make special type of
artificial aggregates. In these aggregates most
are light weight aggregates and heavy
weight aggregates
Classification According to Size
Fine AggregatesCoarse Aggregate
Fine Aggregates
“Fine aggregate” is defined as
material that will pass a No. 4 sieve and will, for the
most part, be retained on a No.
200 sieve
Types Of Fine Aggregates
Sand Stone dustCinderSurkhi
Sand
The first type of fine aggregate is Sand. Sand is
little particles of silica. Larger particles are
categorized as gravel; smaller particles are
categorized as silt or clay.
Types of Sand
Pit SandRiver SandSea Sand
Pit Sand
Sand from a pit, as distinct from river or sea sand. When
we washed and screened it is good
sand for general purposes.
River Sand
River Sand obtained from the banks and beds of rivers is also coarse
and fine. Coarse sand is best for use
in construction works.
Sea Sand
This sand is obtained from the shore of sea. The shape of this sand is rounded. Due to
water of sea it mixes with different
chemicals.
Stone Dust
This is the 2nd type of fine aggregate.
Stone dust is a finely crushed material used to fill in the spaces between
gravel
CinderCinder is the slag
from a metal furnace. Before use this slag we crushed this so
that its size remains in fine aggregate.
SurkhiSurkhi is finely
powdered burnt clay and
generally made from slightly under burnt
bricks.
Coarse Aggregate
Course aggregate basic material of the concrete. Crushed
stone or gravel used in concrete are called
coarse aggregate and it will not, pass when
it is dry through a sieve with ¼-inch-
diameter.
Types of coarse Aggregates
Stone BallastGravelBrick BallastClinker
Stone Ballast
Stone ballast produced by mining a suitable rock deposit
and breaking the removed rock down to the desired size
using crushers.
Gravel
Gravel is a mix of rock pieces or small
rocks. These are also called rounded
rocks.
Brick Ballast
For unimportant works we can use
brick ballast in concrete as coarse
aggregates. For this purpose well burned bricks are
chosen.
Clinker
Clinker is uses for produced Portland
cement. It may also be combined with other active ingredients or chemical admixtures
to produce.