Experimental Study On Influence Of Polyvinyl Alcohol Fiber And Steel Fiber On Fracture Properties Of High Performance Fiber Reinforced Cementitious Composites

ABSTRACT:This thesis presents an experimental research on the influences of polyvinyl alcohol(PVA) fiber and steel fiber on mechanical properties of compressive strength and fracture energy of high performance fiber reinforced cementitious composites (HPFRCC).A series of HPFRCC was prepared with ratio of water to binder (W/B) (0.26,0.36, 0.42 and 0.50), polyvinyl alcohol(PVA) fiber with 3 fiber volume factions(0,1.00%and 2.00%) and steel fiber with 4 volume factions(0,1.00.%,1.50.%and 2.00%). Mechanical properties measured include compressive strength and fracture energy. Compressive strength is the basic mechanical properties of HPFRCC; fracture energy can reveal energy absorbed by the fibers during fracturing of the HPFRCC.The results revealed fracture energy of PVA fiber HPFRCC was enhanced with the increase of fiber volume fraction at the same condition of the ratio of water to binder (W/B).Fracture energy of steel fiber HPFRCC with 1.50% fiber volume factions was the highest than 1.00% fiber volume factions and 2.00% fiber volume factions at the same condition of the ratio of water to binder (W/B).Fracture energy of steel fiber HPFRCC was higher than that of PVA fiber HPFRCC at the same condition of the ratio of water to binder (W/B) and fiber volume fraction by three-point bend test.Compressive strength of steel fiber HPFRCC and PVA fiber HPFRCC was enhanced with the increase of fiber volume fraction at the same condition of the ratio of water to binder (W/B).Compressive strength of steel fiber HPFRCC was higher than that of PVA fiber HPFRCC at the same condition of the ratio of water to binder (W/B) and fiber volume fraction.Compressive strength of PVA fiber HPFRCC was enhanced with the increase of fiber volume fraction at the same condition of the ratio of water to binder (W/B).The level was not more than 10%, because the porosity of the matrix was enhanced with the increase of PVA fiber volume fraction.Both of PVA fiber and steel fiber can increase the Toughness of HPFRCC with different ways.