Prediction of the Fresh Performance of Steel Fiber Reinforced Self-Compacting Concrete Using Quadratic SVM and Weighted KNN Models

Osman Altay,Kursat Esat Alyamac,Mustafa Ulas

doi:10.1109/access.2020.2994562

Abstract

Steel fiber reinforced self-compacting concrete (SFRSCC) is a special type of concrete that is widely researched in literature due to its superior properties. As it is difficult to provide its high workability qualities, SFRSCC is thought to be in need of an economic and quick design process. In this study, it is aimed to predict the fresh properties of SFRSCC mixtures following with the standards at the preliminary design stage. With this aim, two different classification methods were applied successfully to a comprehensive dataset collected from international publications. The models used to classify the fresh performance of SFRSCC were Weighted K-Nearest Neighbors (W-KNN) and Quadratic Support Vector Machine (Q-SVM). Consequently, acceptable success rates were obtained from the models. For the prediction of slump-flow, the accuracy values were 0.76 and 0.84 for the W-KNN and Q-SVM models, respectively. For the V-funnel time, the accuracy values were 0.90 and 0.92 for the W-KNN and Q-SVM models, respectively. Owing to the recommended methods, it is expected to reduce the number of trial mixtures in the preliminary design stage of SFRSCC.

Highlights

The normal concrete has many advantages and limitations
Quadratic Support Vector Machine (Q-support vector machine (SVM)) performed better at 9.8% inaccuracy, 4.7% in sensitivity, 13.3% in specificity, 17% in precision and 10.4% in f-measure compared to K-nearest neighbor (KNN)
When the models were evaluated with the f-measure value, Q-SVM was observed that it was more successful in the slump-flow experiment by 10.4% and the V-funnel experiment by 2.2%

Summary

Introduction

The normal (traditional) concrete has many advantages and limitations. The concrete that is obtained by improving the fresh and hardened performance of the normal concrete or by turning the limitations into an advantage is named as special concrete. Fresh concrete performance is the indispensable property that provides widespread use of SCC. As it passes among the rebars with its weight and settles into the mold without applying any vibration, it provides excellent advantages to SCC [2]. Steel fiber is added to SCC to improve the performance of hardened concrete [3]. The optimum amount of steel fiber in concrete ensures maximum flexural strength. The added steel fibers negatively affect the performance of

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Methods

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Conclusion