Statistical Modeling and Multi-Response Optimization of Sustainable Recycled Aggregate Concrete Using Response Surface Methodology
DOI:
https://doi.org/10.66279/xw89r318Keywords:
Recycled aggregate concrete, Response surface methodology (RSM);, Multi-response optimization, Compressive strength, Desirability functionAbstract
This study investigates the influence of natural aggregate (A), recycled aggregate (B), and treatment type (C) on slump and compressive strength at 7, 28, and 90 days. A quadratic response surface methodology (RSM) was applied to model linear, interaction, and quadratic effects. ANOVA confirmed model significance (p < 0.0001), with high F-values. Natural aggregate (A) was the dominant factor (F = 547.60 for slump, 425.74 for CS7, and 485.30 for CS90), while recycled aggregate (B) showed negligible influence within the studied range. Treatment type (C) exhibited significant nonlinear effects through its quadratic term (C²). The models demonstrated excellent predictive capability (R² = 0.9965 for slump, 0.9941 for CS7, and 0.9943 for CS90), with low standard deviation (≤ 0.7591) and high adequate precision (up to 60.336). Residual diagnostics confirmed normality, independence, and absence of bias. Response surface analysis indicated that increasing natural aggregate enhances both workability and strength. Optimization identified optimal conditions at A = [A*], B = [B*], and C = [C*], achieving a desirability of D = [D*]. These findings provide a robust statistical basis for optimizing sustainable concrete mixtures incorporating recycled aggregates.
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