3.0) Result and Analysis

Test

Ref

Test

Locatio

n

Recorded R

Value

Mean R Inclina

tion

Angle

Corrected

R

Compressive

Strength(N/mm²)

Beam

40 28 39 433 ÷12

= 36.083 90 36 30.1538 39 37

22 42 28

42 40 38

Slope

36 36 42 423 ÷12

= 35.25 90 35 28.4536 34 32

36 36 38

35 31 31

Stairs

42 48 41 474 ÷12

=39.50 45 40 36.9539 41 46

40 42 41

50 40

Column 32 31 35 382 ÷ 12

=31.833 90 32 23.732 28 31

27 30 38

31 29 38

Slope 41 43 47 525÷12

=43.75 45 44 44.2548 41 44

46 41 39

51 42 42

Concrete

Cube

24 28 31 383 ÷12

=31.917 90 32 23.734 38 32

38 32 30

32 34 34

Compressive Strength (N/mm²)

(1) Beam = (33.5 + 26.8)/2

= 30.15 N/mm²

(2) Slab = (31.8+25.1)/2

= 28.45 N/mm²

(3) Stairs = (40.5 + 33.4)/2

= 36.95

(4) Column = ( 26.9 + 20.5)/2

= 23.7

(5) Slope = ( 47.9 + 40.6)/2

= 44.25

(6) Concrete Cube = (26.9 + 20.5)/2

= 23.7

Beam Slab Stair Column Slope Concrete Cube

0

5

10

15

20

25

30

35

40

45

50

Compressive Strength

Compressive Strength

Rebound hammer test method is based on the principle that the rebound of an elastic mass depends on the hardness of the concrete surface against which the mass strikes. The operation of the rebound hammer is shown in figure above.The highest compressive strength are shown by Slope test 44.25 N/mm² and followed by Stairs 36.95 N/mm².The lowest strength are shown by Column test t 23.7 N/mm²