Cement Concrete.ppt Portland cement cement concrete 82 pages 6.
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Cement Concrete.ppt Shailesh J.metha School Of Management, Iit Bombay CHE PHYSICAL C Portland cement cement concrete Shailesh J.metha School Of Management, Iit Bombay CHE PHYSICAL C 6. ![]() The yield strength (YS), ultimate tensile strength (UTS) and the elongation of 50 specimens of the three materials were determined using a universal testing machine. Three beams of concrete strength 20 Nmm2 at age 28 days were separately reinforced with bamboo, rattan and steel bars of same percentage, while the stirrups were essentially mild steel bars. The beams were subjected to centre-point flexural loading according to BS 1881 to evaluate the flexural behaviour. The YS of bamboo and rattan bars were 13 and 45 of that of steel respectively, while their UTS were 16 and 62 of that of steel in the same order. The elongation of bamboo, rattan and steel were 7.42, 10 and 14.7 respectively. The natural rebars were less than the 12 minimum requirement of BS 4449. The load-deflection plots of bamboo and steel RC beams were quadratic, while rattan RC beams had curvilinear trend. The stiffness of bamboo RC beams (BB) and rattan RC beams (RB) were 32 and 13.5 of the stiffness of steel RC beams (SB). Concrete Microstructure Properties And Materials To Word Crack Residual FlexuralThe post-first crack residual flexural strength was 41 for BB and SB, while RB was 25. Moreover, the moment capacities of BB and RB corresponded to 51 and 21 respectively of the capacity of steel RC beams. The remarkable gap between the flexural capacities of the natural rebars and that of steel can be traced not only to the tensile strength but also the weak bonding at the bar-concrete interface. It can be concluded that the bamboo bars are suitable rebars for non-load bearing and lightweight RC flexural structures, while more pre-strengthening treatment is required more importantly for rattan for improved interfacial bonding and load-carrying capacity.
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