The composites are obtained by mixing natural cement prompt(VICAT), sand and water for several weight concentrations of DPF(5, 10, 15, 20, 25 and 30%). The composites are performed by mixing the fibers, cement and sand in a mixer (40 turn/min) during 5 min.Dry mixing is necessary to homogenize the mixture, so water is then added gradually. Then, the mixture is versed into cubic molds(15 cm × 15 cm × 15 cm). Drying of the samples was performed in the open air for 48 h in the molds and 28 days after demoulding. The proportions of the materials used in mixtures are presented in Table 1: