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Table 3 Experimental mechanical properties of concrete.

From: A Unified Formula for Calculation of Crack Width and Spacing in Reinforced Concrete Beams

Mixture

fcu (MPa)

fck (MPa)

fts (MPa)

Ec × 104 (MPa)

Age (days)

Batch number

C30

37.7

26.4

2.0

3.8

200

1

C40

42.6

32.3

2.7

3.7

250

2

C50

53.0

33.3

3.4

3.7

260

3

C60

66.3

61.8

3.3

4.1

290

4

C60

67.1

62.3

3.4

4.1

300

5