JavaScript must be enabled in order to use this site.Please enable JavaScript in your browser and refresh the page. Concrete Flexural Tensile Strength The flexural tensile strength for concrete is calculated per 3.1.1.3 as function of f'c (using the alternative option due to absence of data). The characteristic value is multiplied by 1.4 to obtain the mean value. Parent topic: AS 3600-2018 code implementation