A comprehensive study on the effects of drying temperature and aggregate shape on the concrete compressive strength: Experiments and Data mining techniques

Document Type: Original Article

Authors

1 Department of Mechanical and Instrumental Engineering, Peoples' Friendship University of Russia (RUDN)

2 Department of Mechanical and Instrumental Engineering, Academy of Engineering, Peoples' Friendship University of Russia (RUDN University)

3 School of Science & Engineering, Division of Solid Mechanics, Sharif University of Technology, International Campus, Kish Island, Iran

Abstract

The main purpose of this paper is to assess the impact of the geometry and size of the aggregate as well as the drying temperature on the compressive strength of the ordinary concrete. To this end, two aggregates with sharp and round corners were prepared in three different aggregate sizes. After preparing concrete samples, the drying operations were carried out in the vicinity of room temperature, cold wind, and hot wind. Next, the linear relationship between the concrete strength and the studied parameters was estimated using Multiple Linear Regression (MLR) method. Finally, the Taguchi Sensitivity Analysis (TSA) and Decision Tree Analysis (DTA) were applied in order to determine the importance of the parameters on the compressive strength of concrete. As a result, it is obtained that the aggregate size has the greatest influence on the compressive strength of the ordinary concrete followed by drying temperature as stated by method TSA and DTA. The prediction of the strength obtained by Taguchi method and second-order regression with the experimental data are in a good agreement. It was concluded that the drying temperature impact on the concrete strength is several times greater than the effect of the aggregate geometry. Finally, the main conclusion of this research paper is related to the application of cold wind for drying operation, which leads to an increase of the compressive strength by 8.67% and 11.55% for ordinary concrete containing a constant aggregate size of 20 and aggregate geometries of round and sharp corners, respectively.

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