foundation system of burj al arab

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)

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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