Introduction of hybrid fiber and calcium carbonate (CaCO 3 ) whisker could improve the properties of cementitious composites. Nevertheless, little attention has been paid to influences of steel-polyvinyl alcohol (PVA) hybrid fiber and whisker on stress-strain behavior of hybrid fiber reinforced cementitious composites (HFRCC). In this research, 19 groups of mixtures have been used to explore this topic. The results present that CaCO 3 whisker can improve the compressive strength, peak strain and prepeak strain energy of steel-PVA HFRCC. Generally, HFRCCs reach better compressive behavior when the fibers size are grading. For example, 13 mm steel fiber+ 6 mm PVA fiber+ whisker and 35 mm steel fiber+ 12 mm PVA fiber+ whisker are better than 13 mm steel fiber+ 12 mm PVA fiber + whisker and 35 mm steel fiber+ 6 mm PVA fiber+ whisker. The results are employed to develop formulas for calculating the strength, deformation, and toughness of HFRCC. Two models were developed to evaluate the stress-strain response of HFRCC. The prediction results of prepeak stress-strain curves using Model 2 (piecewise function involves a cubic parabola and a rational fraction) are closer to the experimental curves and lower than those using Model 1 (continuous rational power function). Therefore, Model 2 is recommended if more accurate prediction of the prepeak stress-strain curve is required. Otherwise, the simpler Model 1 can be used.

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