Table 2 Summary of calculated statistical metrics for different compression test specimens, and conversion factors among different shapes and sizes.

From: Compressive strength and maturity of UHPC cubes and cylinders: new conversion factors and recommendations for early-age quality control

UHPC Type

St. Deviation [MPa]

Coeff. of Variation [%]

Conversion Factors

cylinder

cube size 1

cube size 2

cylinder

cube size 1

cube size 2

cube 1 to cyl.

cube 2 to cyl.

cube 1 to cube 2

Site-cured specimens

A – 2% SFs

2.7

2.9

2.3

15.2

32.4

17.9

1.19

1.59

1.37

B1–1% SFs

0.7

2.5

2.9

1.7

13.3

24.2

1.10

1.10

0.99

B2–2% SFs

2.0

3.5

3.3

13.9

29.2

23.6

1.23

1.11

0.90

C1–1% SFs

1.9

2.0

3.3

12.0

11.6

33.2

1.01

1.42

1.45

C2–2% SFs

1.8

3.4

2.7

9.6

28.7

15.0

1.34

1.15

0.86

D – 2% SFs

1.3

1.2

1.4

5.4

3.7

5.4

1.35

1.24

0.94

E1–2% SFs w/o acc

1.8

2.1

2.3

11.7

13.7

18.7

0.96

1.00

1.04

E2–2% SFs w/acc

1.4

2.3

1.8

6.0

24.2

16.7

1.13

0.93

0.84

Mean site cured

1.7

2.5

2.5

9.4

19.6

19.3

1.16

1.19

1.05

Lab-cured specimens

A – 2% SFs

1.8

1.5

1.9

12.2

5.6

12.7

1.18

1.43

1.22

B1–1% SFs

1.7

2.0

2.3

9.0

12.8

16.9

1.16

1.38

1.23

B2–2% SFs

3.5

2.5

3.0

34.1

20.7

33.0

1.12

1.40

1.49

C1–1% SFs

2.7

3.0

2.8

21.1

27.9

27.3

1.09

1.39

1.34

C2–2% SFs

2.9

2.5

3.3

19.5

16.8

26.7

1.21

1.05

0.89

D – 2% SFs

2.3

2.7

2.1

17.8

25.2

15.2

1.11

0.91

0.82

E1–2% SFs w/o acc

1.2

1.6

2.4

4.8

11.6

29.5

1.05

1.04

0.96

E2–2% SFs w/acc

2.0

2.0

4.2

16.1

27.7

63.0

1.22

1.17

0.96

Mean lab cured

2.3

2.2

2.8

16.8

18.5

28.0

1.14

1.22

1.11

Overall mean

2.0

2.4

2.6

13.1

19.1

23.7

1.15

1.21

1.08

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