In the present study, reactive powder concrete (RPC) was investigated with three different types of single fibers that is, steel fiber (SF), glass fiber (GF), and carbon fiber (CF). Moreover, the effect of hybrid SF‐GF, GF‐CF, and CF‐SF on RPC was also investigated. In case of both single and hybrid fiber‐reinforced RPCs, a constant volume fraction of 2% fiber was used. A plain RPC was also produced that served as a reference/control mix. Studied parameters include compressive strength, modulus of elasticity, peak strains in compression, compression toughness, total energy absorbed in compression, splitting tensile strength, and flexural strength. Results showed that among single fiber‐reinforced RPCs, CF‐RPC performed better than both SF‐ and GF‐RPC in compression. Whereas, single SF‐RPC performed better than GF‐ and CF‐RPC in splitting tensile and flexural strength, single SF‐RPC showed significant softening response compared with single CF and GF‐RPC. CF‐RPC showed comparable performance to that of the SF‐RPC in both tensile and flexural strength. But CF‐RPC showed lower toughness than SF‐RPC. Hybridization of 1%SF and 1%CF yielded maximum overall mechanical performance among both single and hybrid fiber RPCs. Maximum attribution (17–38%) of fibers was toward flexural strength compared to other strength properties.
Durability and ductility of plain cement concrete (PC) can be upgraded by the simultaneous incorporation of fibers and supplementary cementitious materials. To this end, influence of different fibers such as steel fiber (SF), glass fiber (GF), carbon fiber (CF), and polypropylene fiber (PF) is studied on mechanical and durability properties of concrete with and without silica fume. Silica fume was used as 10% by mass replacement of ordinary Portland cement. Various mechanical and durability properties were studied such as compressive strength, split tensile strength, flexural strength, water absorption (WA), chloride penetration (CP), and acid attack resistance of concrete. The results of testing revealed that silica fume improved the efficiency of fibers in resisting the tensile and flexural loads. The composite effect of fiber and silica fume was more beneficial than the sum of the effects of their individual incorporation. Steel fiber‐reinforced concrete (SFRC) showed better mechanical performance at 28 days as compared to other FRCs but CFRC showed better performance at 180 days. PFRC and CFRC exhibited better durability performance than SFRC and GFRC. Silica fume helped in reducing the WA and CP of FRCs and improved their acid attack resistance.
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