### STUDY ON STRENGTH OF CONCRETE USING VARIOUS COARSE AGGREGATES, PART-21

CHAPTER – 7

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)

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.