Document Type : Original Article
Authors
1
Ph.D. Student, Department of Civil Engineering, Urmia Branch, Islamic Azad University, Urmia, Iran
2
Associate Professor, Department of Civil Engineering, Urmia Branch, Islamic Azad University, Urmia, Iran
3
Assistant Professor, Department of Civil Engineering, Urmia Branch, Islamic Azad University, Urmia, Iran
Abstract
Concrete is one of the most fundamental and widely used materials in the construction industry. Development and innovation in this field have led to the introduction of self-compacting concrete (SCC), which has brought considerable technological developments. The mix design of SCC is one of the substantial issues, so the number of materials used in this concrete must be measured precisely. On the other hand, testing the compressive strength of concrete at certain ages causes high costs, concrete waste, and environmental damage. Modern artificial intelligence techniques that are capable of learning and modeling sophisticated problems have been increasingly used in concrete technology over the past years. Therefore, this study adopts various machine learning methods, including support vector machine (SVM), Multivariate Adaptive Regression Splines (MARS), and model tree (Mp5-MT) to predict the rheological behaviors and compressive strength of SCC. For this purpose, four parameters of slump flow’s diameter, L-box ratio (L), funnel duration (V), and 28-day compressive strength of concrete were collected through authenticate resources. Input variables included Binder amount, Supplementary Cementitious Materials (SCMs), water binder ratio, amount of fine and dry materials, and Superplasticizers. As the MARS technique comprises some hyperparameters whose values highly affect the model accuracy, the optimization technique of the Gravitational Search Algorithm (GSA) has been used in this study to determine these values. The results of this study showed that the MARS model integrated with the optimization GSA technique can enhance the anticipation accuracy by up to 1.35%. 11.1%, 2.3%, and 1.07% rather than the MARS model. Also, the Mp5-MT model outperformed the MARS-GSA model in predicting results, so this is proposed as the selected model for predicting rheological behaviors and compressive strength of SCC.
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