The Effect of Fibers Type and Content on Nano Silica Concrete [Nsc]

The research goal is the study of fiber content and fiber type influences on NSC compressive and tensile strengths. fiber type[(steel, polypropylene and glass ) and fiber content were studied. A constant water/binder equals to 0.45 and aconstant binder content =400kg/m 3 were used. the percentages of nano silica[NS] that replaced cement in this research were 0 and1.5%. Polypropylene fiber [PPF] with 12mm length and 4 dosages of 0%, 0.2%,0.4% and 06.% are used. Glass fiber [GF] with 18mm length and 4 dosages of 0%, 0.2%,0.4% and 06.% are also used. Steel fiber [SF] with 50mm length,0.5mm diameter and 4 dosages of 0%, 0.4%,0.8% and 1.2% are used. The results illustrated that 1.5%NS has improvement on normal concrete compressive and tensile strengths. Increasing of SF content from 0.4% to 1.2% has significant improvement on NSC compressive and tensile strengths. PPF and GF addition caused decreasing on NSC compressive and tensile strengths.