Geomechanics and Engineering

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Prediction of concrete strength from rock properties at the preliminary design stage

  • Karaman, Kadir (Department of Mining Engineering, Karadeniz Technical University) ;
  • Bakhytzhan, Aknur (Department of Mining Engineering, Karadeniz Technical University)
  • Received : 2020.01.21
  • Accepted : 2020.09.25
  • Published : 2020.10.25
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Abstract

This study aims to explore practical and useful equations for rapid evaluation of uniaxial compressive strength of concrete (UCS-C) during the preliminary design stage of aggregate selection. For this purpose, aggregates which were produced from eight different intact rocks were used in the production of concretes. Laboratory experiments involved the tests for uniaxial compressive strength (UCS-R), point load index (PLI-R), P wave velocity (UPV-R), apparent porosity (n-R), unit weight (UW-R) and aggregate impact value (AIV-R) of the rock samples. UCS-C, point load index (PLI-C) and P wave velocity (UPV-C) of concrete samples were also determined. Relationships between UCS-R-rock parameters and UCS-C-concrete parameters were developed by regression analyses. In the simple regression analyses, PLI-C, UPV-C, UCS-R, PLI-R, and UPV-R were found to be statistically significant independent variables to estimate the UCS-C. However, higher coefficients of determination (R2=0.97-1.0) were obtained by multiple regression analyses. The results of simple regression analysis were also compared to the limited number of previous studies. The strength conversion factor (k) values were found to be 14.3 and 14.7 for concrete and rock samples, respectively. It is concluded that the UCS-C can roughly be estimated from derived equations only for the specified rock types.

Keywords

Acknowledgement

The study was financially supported by Karadeniz Technical University through the project (No: 7828). The authors would like to express their sincere thanks and appreciation to Dr. Asghar Ali (University of Peshawar) for improving the quality of the paper.

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