Technical Papers
Apr 19, 2021

Prediction of Compressive Strength of Concrete with Manufactured Sand by Ensemble Classification and Regression Tree Method

Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 7

Abstract

Manufactured sand (MS) has been increasingly used as fine aggregate for concrete. This paper proposes a prediction of the compressive strength of concrete with manufactured sand (MS-concrete) based on an ensemble classification and regression tree (En_CART) method. A data set containing 1,350 original measured strengths of 328 concrete mixtures from actual engineering projects were used for training and testing. The cross-validation and experimental data from the literature were also used for validation, both indicating that the En_CART model provides an accurate and robust prediction. The comparison of En_CART with various machine learning methods, including artificial neural network, linear regression, Gaussian process regression, random forest, and support vector machine regressions, indicates that the En_CART model indicates superiority in predicting the compressive strength of MS-concrete. Based on the proposed model, the evolution of compressive strength is analyzed. The importance analysis indicates that age is the most significant factor influencing the compressive strength of MS-concrete, and stone powder content presents approximately 25% of the age contribution. The compressive strength of MS-concrete was found to first increase and then decrease with increasing content of MS. The optimal content of MS slightly increases with an increase in the strength level of MS-concrete. Stone powder, at certain MS content, is also found to indicate remarkable improvement in the compressive strength of MS-concrete. The optimum content of stone powder in MS is higher for MS-concrete with lower strength and lower for MS-concrete with higher strength.

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Data Availability Statement

Some or all data, models, or code that support the findings of this study are available from the corresponding author on reasonable request.

Acknowledgments

The authors gratefully acknowledge the financial support provided by the National Key Research and Development Projects of China (2018YFC0705404), the National Natural Science Foundation of China (51878480, 51678442, 51878481, and 51878496), the Fundamental Research Funds for the Central Universities, and the China Scholarship Council (CSC).

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Journal of Materials in Civil Engineering
Volume 33Issue 7July 2021

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Received: Jul 1, 2020
Accepted: Nov 9, 2020
Published online: Apr 19, 2021
Published in print: Jul 1, 2021
Discussion open until: Sep 19, 2021

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Ph.D. Candidate, Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, School of Materials Science and Engineering, Tongji Univ., Shanghai 201804, China. ORCID: https://orcid.org/0000-0002-1830-6353. Email: [email protected]
Ph.D. Candidate, Magnel-Vandepitte Laboratory, Dept. of Structural Engineering and Building Materials, Ghent Univ., Technologiepark-Zwijnaarde 60, Ghent 9052, Belgium. ORCID: https://orcid.org/0000-0001-5870-3276. Email: [email protected]
Ph.D. Candidate, Magnel-Vandepitte Laboratory, Dept. of Structural Engineering and Building Materials, Ghent Univ., Technologiepark-Zwijnaarde 60, Ghent 9052, Belgium. Email: [email protected]
Zhengwu Jiang [email protected]
Professor, Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, School of Materials Science and Engineering, Tongji Univ., Shanghai 201804, China (corresponding author). Email: [email protected]
Geert De Schutter [email protected]
Professor, Magnel-Vandepitte Laboratory, Dept. of Structural Engineering and Building Materials, Ghent Univ., Technologiepark-Zwijnaarde 60, Ghent 9052, Belgium. Email: [email protected]

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