Journal
MATERIALS
Volume 14, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/ma14040794
Keywords
concrete compressive strength; fly ash waste; ensemble modeling; decision tree; DT-bagging regression; cross-validation python
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Funding
- Wroclaw University of Science and Technology
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Machine learning techniques are widely used in predicting the mechanical properties of concrete. By comparing individual algorithms with ensemble approaches such as bagging, it was found that the ensemble model outperforms decision trees and gene expression programming. Optimization of bagging can improve model accuracy, as demonstrated by various statistical indicators.
Machine learning techniques are widely used algorithms for predicting the mechanical properties of concrete. This study is based on the comparison of algorithms between individuals and ensemble approaches, such as bagging. Optimization for bagging is done by making 20 sub-models to depict the accurate one. Variables like cement content, fine and coarse aggregate, water, binder-to-water ratio, fly-ash, and superplasticizer are used for modeling. Model performance is evaluated by various statistical indicators like mean absolute error (MAE), mean square error (MSE), and root mean square error (RMSE). Individual algorithms show a moderate bias result. However, the ensemble model gives a better result with R-2 = 0.911 compared to the decision tree (DT) and gene expression programming (GEP). K-fold cross-validation confirms the model's accuracy and is done by R-2, MAE, MSE, and RMSE. Statistical checks reveal that the decision tree with ensemble provides 25%, 121%, and 49% enhancement for errors like MAE, MSE, and RMSE between the target and outcome response.
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