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R. A. Khushnood et alii, Frattura ed Integrità Strutturale, 34 (2015) 534-542; DOI: 10.3221/IGF-ESIS.34.59 536 Chemical composition CaO Al 2 O 3 SO 3 SiO 2 Fe 3 O 4 MgO K 2 O Content (wt.%) 44 26.5 12 9.5 2.5 1.3 0.6 Table 2 : Chemical composition of cement [22] The raw bagasse fibers as shown in Figure 1 were washed with tap water and dried in oven for 48 hrs at 105±5 o C. The washed and dried fibers were then pyrolyzed in a quartz reactor at 850 o C for 1h under inert atmosphere. For the provision of inert atmosphere, constant flow of argon was maintained under 0.2 bar pressure in the reactor throughout the pyrolysis process. Carbonized bagasse fibers were ground in ethanol to sub-micron scale by ball milling for 24 hrs followed by 2 hrs of attrition milling. The physical properties of ground nano/micro carbonized bagasse fibers are given in Table 3. Carbonized raw bagasse fibers D 50 D 90 BET surface area (m 2 /g) Density (g/cm 3 ) CRBF 600 1250 19.2 2.26 Table 3 : Physical properties of carbonized raw bagasse fibers Seven mix formulations were prepared including the reference one; detail mentioned in Table 4. Sub-micron carbonized bagasse fibers were used as an additive in six proportions i.e. 0.025%, 0.05%, 0.08%, 0.2%, 0.5% and 1.0% by weight of cement. Weight ratios of water and super plasticizer were kept constant at 35% and 1.5% by weight of cement respectively. Denotations Weight compositions (% mass ratio of cement wt.) Cement Water Superplasticizer CRBF CEM 100 35 1.5 0.00 CRBF_0.025 0.025 CRBF_0.05 0.05 CRBF_0.08 0.08 CRBF_0.2 0.20 CRBF_0.5 0.50 CRBF_1.0 1.0 Table 4 : Mix formulations Figure 1 : Synthesized nano/micro CRBF particles (b) from raw bagasse fibers (a)