CHAPTER – 7
DISCUSSION
DISCUSSION
The following conclusion may be drawn from the experimental
investigation. In this study, the strength of concrete varied with changing
coarse aggregate in constant mix proportion. The design strength was 2800 psi
but the experimental result shows that
•
For compressive strength
Types of coarse aggregate
|
Average
strength (psi)
|
Stone chips
|
2135.33
|
Brick chips
|
2229.67
|
So the ratio of the average strength
of coarse aggregate is
Stone
chips: Brick chips = 2135.33: 2229.67
= 1: 1.05
•
For tensile strength
Types of coarse aggregate
|
Average
strength (psi)
|
|
Stone
chips
|
143.33
|
|
Brick chips
|
166.33
|
So the ratio of the average strength
of coarse aggregate is
Stone
chips: Brick chips = 143.33: 166.33
= 1: 1.16
•
For flexural strength
|
Types of coarse
aggregate
|
Average strength (psi)
|
|
Stone chips
|
525
|
|
Brick chips
|
450
|
So the ratio of the average strength
of coarse aggregate is
Stone
chips: Brick chips = 525: 450
=
1: 0.86
•
For shear strength
|
Types of
coarse aggregate
|
Average
strength (psi)
|
|
Stone chips
|
98.33
|
|
Brick chips
|
84.5
|
So the ratio of the average strength
of coarse aggregate is
Stone chips:
Brick chips = 98.33: 84.5
= 1: 0.86
There are some limitations and
difficulties which are as follows:
(1) Compaction was done by tamping rod.
At the time of compaction a little quantity of water was forced out of the
mould that reduced the required quantity of water.
(2) Twelve cylinders and six beams were
tested. We think if we would increase the number of test specimens that would
certainly give more accurate results.
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