The document discusses several factors that affect the impact strength of concrete, including the shape, size and texture of aggregates, compaction methods, curing processes, and water-cement ratio. It notes that aggregates are key factors, and that proper compaction to 5-10% air void content and curing for 7-14 days are important. An ideal concrete mix ratio is listed as 1:2:4 cement to aggregate.

1. MUBARAK ALI
L-18CE-11
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2. RATIO OF CEMENT AND
AGGREGATE
SHAPE, SIZE, TEXTURE OF THE
AGGREGATE
MODE OF COMPACTION
CURING
CONCRETE MIX
WATER-CEMENT RATIO
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3. Aggregates Are The Key
Factors That Will Affect
The Impact Strength Of
Concrete
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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.
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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
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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
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