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Table 8 Effects of RHA on strength properties of concrete (free w/b = 0.55).

From: Strength and Some Durability Properties of Concrete Containing Rice Husk Ash Produced in a Charcoal Incinerator at Low Specific Surface

RHA replacement (%)

Average compressive strength (N/mm2)

Tensile strength (N/mm2)

3 days

7 days

14 days

21 days

28 days

90 days

180 days

28 days

0

21.24

25.75

31.47

30.71

34.86

40.27

42.95

3.297

5

21.34

27.28

32.94

34.82

37.72

41.08

44.10

3.812

10

19.09

29.57

29.05

34.13

35.53

38.75

42.88

3.834

15

18.96

24.53

29.19

34.40

34.13

37.75

41.61

3.483

20

18.07

24.06

28.33

32.73

32.84

35.81

38.82

3.182

25

17.01

21.07

26.29

30.60

29.38

33.45

34.71

3.176