Formulation of polynomial equation predicting the splitting tensile strength of concrete

Compressive and tensile strength are important parameters to know the quality of concrete. In some circumstances, tensile strength is also required to analyze and design a structure. This study represents a method predicting the split tensile strength through the compressive strength (0 to 120 MPa) of cube and cylinder specimens of concrete by polynomial regression analysis. The polynomial equation for 7 and 28 days have been developed for the following two cases: one is for a cylinder and adjusted cylinder any compressive strength (f'c) with w/b ratio >= 0.51 or a cylinder and adjusted cylinder compressive strength (f'c) <= 20 MPa with any w/b ratio and other is for a cylinder and adjusted cylinder compressive strength (f'c) > 20 MPa with w/b ratio < 0.51. To formulate the model, experimental data have been gathered from various literatures. It is noticed that split tensile strength gaining rate is not so high in 7 days as like as compressive strength. It is also noticed traditional models are less fit in 7 day's strength prediction than 28 day's prediction. The suggested equations are evaluated based on R-2, RMSE, MAPE, and IAE parameters and compared with other models. (C) 2020 The Authors. Published by Elsevier Ltd.