This study on mortar reinforced with discontinuous carbon fibers intends to examine the flexural stress-deflection relation by analysis using the experimentally obtained tensile and compressive stress-strain relations and the crack density of flexural test specimen. The summaries of the results are as follows; (1) By using the crack density, the error between analytically and experimentally obtained deflections gets smaller compared to former analysis. (2) From the analytically obtained data in the condition of maximum flexural load, the distributions of stress and the extreme fiber strains in cross-section and the relationship between the deflections loaded under two different conditions are discussed. (3) The crack density of flexural test specimen can be predicted from independently obtained result of tensile test.
