PSI - Issue 71

Sphurty Raman et al. / Procedia Structural Integrity 71 (2025) 409–416

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3.3 Statistical Parameters

Table 6 Statistical Analysis of Concrete Properties with Varying RCA Content (WGP = 0%) Property Mea n Std. Dev Min 25% 50% 75% Max Rang e

30.00 25.82 0.00 10.00 30.00 50.00 60.00 60.00 35.34 4.54 29.58 32.34 35.78 38.48 40.20 10.62 4.44 0.53 3.71 4.27 4.54 4.67 4.98 1.27 8.09 2.46 5.28 6.98 7.92 9.34 11.24 5.96 4.32 0.55 3.54 4.16 4.46 4.58 4.82 1.28

RCA (%)

Compressive Strength (MPa) Flexural Strength (MPa) Water Absorption (%) Split Tensile Strength (MPa)

Slump (mm)

93.75 2.99 90.00 92.25 94.00 95.50 97.00 7.00

Table 7 Statistical Analysis of Concrete Properties with Varying WGP Content (RCA = 40%) Property Mea n Std. Dev Min 25% 50% 75% Max Rang e

20.83 14.29 0.00 10.00 20.00 30.00 40.00 40.00 32.63 1.21 30.80 32.05 32.65 33.33 34.26 3.46 4.25 0.21 3.90 4.18 4.28 4.38 4.51 0.61 8.96 0.54 8.27 8.63 8.93 9.23 9.80 1.53 4.30 0.12 4.10 4.24 4.32 4.38 4.45 0.35

WGP (%)

Compressive Strength (MPa) Flexural Strength (MPa) Water Absorption (%) Split Tensile Strength (MPa)

Slump (mm) 73.33 14.72 55.00 65.00 72.00 83.00 95.00 40.00 Statistical analysis of concrete properties with varying RCA and WGP content reveals significant trends. As RCA content increases from 0% to 60%, compressive, flexural, and split tensile strengths decrease (ranges: 10.62 MPa, 1.27 MPa, 1.28 MPa, respectively), while water absorption increases (range: 5.96%). Workability declines moderately (range: 7 mm slump). With 40% RCA, increasing WGP content causes smaller strength reductions (compressive: 3.46 MPa, flexural: 0.61 MPa, split tensile: 0.35 MPa) and slightly higher water absorption (range: 1.53%). Workability decreases substantially (range: 40 mm slump). These findings underscore the need for optimized mix designs balancing environmental benefits with concrete performance. 3.4 Regression Analysis of Mechanical Properties vs. Slump

y = 0.078x + 26.903 R² = 0.9585

30 31 32 33 34 35

Fig. 5 Comparison of Actual vs. Estimated Compressive Strength for Various Mix Design Compressive Strength (MPa) Estimated Compressive Strength (MPa) 28 30 32 34 36 R40G0 R40G10R40G20R40G25R40G30R40G40 MIX

50

60

70

80

90

100

(MPA)

(MPA)

SLUMP (MM)

Compressive Strength (MPa) Linear (Compressive Strength (MPa))

COMPRESSIVE STRENGTH

COMPRESSIVE STRENGTH

Fig. 4 Correlation between Compressive Strength and Slump