Fiber-reinforced cement or concrete is a separate and wide field of study, which is scope of this paper In the current paper, analytical linear models are beyond considered in order to predict the results of the compressive strength, modulus of elasticity, and flexure tests at 28 days concrete age. The input data for models are based on the correspondent tests results retrieved from previous experimental studies The variables considered in the linear models are: fibers volume fraction, coarse aggregate reduction, and fibers aspect ratio