Document Type : Research Article
Faculty of Technical and Engineering, Imam Khomeini International University, Qazvin, Iran.
Nowadays, non-destructive tests are of great importance for evaluating the quality of concretes. However, such tests typically measure the relevant parameters indirectly, followed by estimating the strength of the concrete using several equations. Accordingly, the present study utilized the friction transfer method to directly evaluate the compressive and tensile strengths and the rupture modulus of glass and polypropylene fiber reinforced pozzolanic concretes at different ages. The in-situ test results were related to the strength of the fiber-reinforced pozzolanic concrete using linear and power regression analyses. Afterward, calibration curves were plotted to translate the friction transfer results into compressive and tensile strengths and the rupture modulus. To realize this objective, eight mixed designs with compressive strengths of 15-50 MPa were employed. In addition, the effects of the fibers on the adhesion of the mortar and steel were evaluated using the friction transfer test. ABAQUS was employed to model non-reinforced and fiber reinforced concrete specimens and the effects of fibers on the results. The results indicated high correlation coefficients between the experimental tests and friction transfer test results. The addition of fibers led to the improved compressive behavior of the concrete, reduced mortar shrinkage, and increased concrete-steel adhesion.