Influence of Specimen Shape and Mix Proportion on Tensile Property of Green High Performance Fiber Reinforced Cementitious Composites (GHPFRCC)

Li, X.; Luo, M., and Yan, Q., 2015. Influence of specimen shape and mix proportion on tensile property of green high performance fiber reinforced cementitious composites (GHPFRCC).

This paper investigates the tensile property of green high performance fiber reinforced cementitious composites (GHPFRCC) with focus on the influence of sample shape and mix proportion. Direct tensile tests are performed on the rectangle shaped plate coupons and dumbbell shaped ones, followed by sixteen kinds of mix proportions based on the orthogonal experiment method, considering such influencing factors as fly ash replacement by weight (60%, 65%, 70%, and 75%), water-binder ratio (0.24, 0.28, 0.32, and 0.36), sand-binder ratio(0.36, 0.46, 0.56, and 0.66), polyvinyl alcohol (PVA) fiber by volume (1.5%, 1.7%, 2.0%, and 2.2%) and water reducing agent by weight (0.10%, 0.15%, 0.20%, and 0.25%). And then, the tensile strength and ductility of GHPFRCC are highlighted and discussed. Experimental results show that the limit tensile deformation capacity of GHPFRCC is far better than that of the normal concrete. Water-binder ratio has a greater influence on the tensile strength and the optimal value is 0.24. GHPFRCC can obtain higher tensile strength when sand-binder ratio is 0.46. The limit tensile strength and deformation of the dumbbell shaped GHPFRCC specimens are usually better than those of the rectangle shaped plate coupons.