Modeling for the Evaluation of Strength and Toughness of High-performance Fiber Reinforced Concrete

This paper presents the multivariate linear models for the evaluation of compressive, flexural and splitting tensile strengths, and toughness ratio of high-performance steel fiber reinforced concrete (HPSFRC). In this study, 44 series of concrete mixes with varying silica fume replacement and fiber dosage (Vf = 0.0, 0.5, 1.0 and 1.5%) were considered. Test results indicated that addition of fibers into silica fume concrete improves the compressive strength moderately and tensile strengths significantly. Based on the test results of 144 specimens, multivariate linear regression models were developed for the prediction of 28-day strength and toughness properties of HPSFRC and the absolute variations obtained are 1.09%, 2.36%, and 3.36% for compressive, flexural, and splitting tensile strengths, respectively. The validity of the proposed models was verified with the test data of earlier researchers. The proposed models were shown to provide results in good correlation with experimental results. The predicted values were also analyzed at significance level of 0.05.