Table 1 Concrete mix proportions used for casting girders.

Cement type-III

218

308

415

Fly ash type-F

89

147

119

Cementitious content

307

455

534

Fine aggregate

685

685

634

Coarse aggregate

1304^a

1125^a

1304^b

Coarse agg./fineagg. ratio

1.91

1.64

2.06

Water

107

136

142

Water/cement ratio

0.49

0.43

0.34

Water/cementitious materials ratio

0.35

0.30

0.27

Superplasticizer (mL/100 kg)

–

624^c

832^d

Retarder (mL/100 kg)

–

65

260

Slump (cm)

16.5

21.6

26.7

Actual average strength (MPa)

48.3^e

89.6^e

110.3^e