2. RATIO OF CEMENT AND
AGGREGATE
SHAPE, SIZE, TEXTURE OF THE
AGGREGATE
MODE OF COMPACTION
CURING
CONCRETE MIX
WATER-CEMENT RATIO
2
3. Aggregates Are The Key
Factors That Will Affect
The Impact Strength Of
Concrete
3
4. SHAPE, SIZE, TEXTURE OF
THE AGGREGATE
The most common size of
aggregate used in concrete is
20mm
coarse aggregate larger than
4.75 mm
fine aggregates below 4.75
mm.
4
5. MODE OF COMPACTION
Compaction is a process that
brings about an increase in soil
density or unit weight,
accompanied by a decrease in air
volume
Compaction leading to air void
content of 5% and 10 % results in
loss of strength of 30% to 55%
respectively. 5
6. CURING
Curing of concrete is
defined as providing
adequate moisture,
temperature, and time to
allow the concrete to
achieve the desired
properties for its intended
use.
Curing must be done 7 to
14 days
6
7. 7
• The main object of
mixing concrete is to
obtain a uniform and
easily workable
concrete paste
• Concrete mix ratio
1:2 :4
8. WATER-CEMENT RATIO
The water-cement ratio
is ratio of volume of
water in concrete to the
volume of the cement
Water–cement ratio
is 0.45 to 0.60
8