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Table 4 Summary of the test results—Phase II.

From: Strength and Durability Evaluation of Recycled Aggregate Concrete

Mix

Unit weight kg/m3

Slump/flow (cm)

Air content %

\( f_{c}^{\prime} \)

Split tensile f ct

Modulus of rupture

RCPT

f ct (Mpa)

\( f_{ct} /f_{c}^{\prime} \) (%)

Equation 1

Equation 2

fr (Mpa)

\( \frac{{f_{\text{r}} }}{{\left( {f_{c}^{\prime} } \right)^{0.5} }} \)

Equation 3

Equation 4

Coulombs

Class

2,5

2187

52

Flow

3.3

47.68

2.8

5.90

3.11

2.96

5.61

0.81

4.83

5.17

3965

Moderate

1,2,5

2317

59

Flow

3.9

46.90

3.5

7.41

3.08

2.93

6.9975

1.02

4.79

5.14

2214

Low

4

2085

52

Flow

3.3

40.89

3.0

7.46

2.88

2.67

5.67

0.89

4.48

4.80

4508

High

1,4

2194

49

Flow

2.3

51.89

2.6

5.02

3.24

3.13

5.4225

0.75

5.04

5.40

3436

Moderate

1,5

2172

49

Flow

4.3

50.80

2.34

4.61

3.21

3.08

6.345

0.89

4.99

5.35

5573

High

1,4,5

2143

14

Slump

3.5

42.24

3.2

7.59

2.92

2.73

4.455

0.69

4.55

4.87

4385

High

Control

2338

58

Flow

3.1

51.85

3.0

5.78

3.24

3.12

6.57

0.91

5.04

5.40

2007

Low

  1. Equation 1 \( {\text{Split tensile}}{-\!\!-}f_{ct} = 0.45 \left( {f_{c}^{\prime} } \right)^{0.5} ,\,f_{c}^{\prime} = {\text{cube strength in MPa}}\) BSI EN 1097-2:2010 (2010b)
  2. Equation 2 \( {\text{Split tensile}}{-\!\!-}f_{ct} = 0. 2 4 { }\left( {{\text{f}}^{\prime} {\text{c}}} \right)^{0. 6 5} ,f_{c}^{\prime} = {\text{cube strength in MPa}}\) (Xiao et al. 2006)
  3. Equation 3 \( {\text{Modulus of rupture}}\,\,f_{r} = 0. 7 { }\left( {f_{c}^{\prime} } \right)^{0. 5} ,\,f_{c}^{\prime} = {\text{cube strength in MPa}}\)BSI EN 1097-2:2010 (2010b)
  4. Equation 4 \( {\text{Modulus of rupture}}\,\,f_{r} = 0. 7 5 { }\left( {{\text{f}}_{\text{c}}^{\prime}} \right)^{0. 5} ,\,f_{c}^{\prime} = {\text{cube strength in MPa }}\)(Xiao et al. 2006)