Skip to main content

Table 8 Repeatability of test parameters for ESH–LWSCC mixtures.

From: Lightweight Self-consolidating Concrete with Expanded Shale Aggregates: Modelling and Optimization

Test method

Mean (n = 6)

SD

COV (%)

Estimated error (95 % CI)

Relative error (%)

Slump flow (mm)

692.50

12.55

1.8

12.26

1.8

V-funnel (s)

3.77

0.23

6.2

0.23

6.1

J-ring flow (mm)

691.67

13.29

1.9

12.99

1.9

J-ring height (mm)

1.50

0.55

36.5

0.54

35.7

L-box (ratio)

0.99

0.01

1.3

0.01

1.2

Filling capacity (%)

98.33

1.21

1.2

1.18

1.2

Sieve segregation resistance (%)

11.83

1.17

9.9

1.14

9.7

7-Day comp strength (MPa)

32.00

1.26

4.0

1.24

3.9

28-Day comp strength (MPa)

45.00

1.79

4.0

1.75

3.9

Fresh unit weight (kg/m3)

1790.67

10.78

0.6

10.54

0.6

28-Day air dry unit (kg/m3)

1674.17

11.44

0.7

11.18

0.7

28-Day oven dry unit (kg/m3)

1614.33

13.85

0.9

13.53

0.8