Flexural Fatigue Strength of Steel Fibre Reinforced Concrete Containing Blends of Limestone Powder and Silica Fume
نویسنده
چکیده
Based upon the statistical distribution of flexural fatigue life data and flexural fatigue strength of the steel fibre reinforced concrete (SFRC) containing blends of limestone powder (LP) and silica fume (SF), the influence of these inserts on the flexural fatigue performance of concretes is probed. Concrete mixes were proportioned to replace 30% cement with these mineral inserts in different trends. The flexural fatigue performance of plain concrete (PC) and SFRC of comparable fibre size, as reported in previous studies is made to compare with the fatigue performance of present mixes to demonstrate the effect of addition of LP and SF as partial replacement of cement. It has been ascertained that distribution of fatigue life of concretes under study can be modeled by two-parameter Weibull distribution. The increased values of shape parameter for concretes containing mineral inserts correspond to its more homogenous microstructure as compared to control concrete. The pozzolanic and filler effect of SF in the cement improves the bulk matrix and strengthens the interfaces between fibre and cement paste and aggregate and cement paste. The modified pore structure of LP based concretes is attributed to its filler effect. The fatigue life data has also been presented in the form of S-N diagram and the two-million cycles fatigue strength/endurance limit for mixes was estimated. Keywords— flexural fatigue strength, limestone powder, silica fume, steel fibre reinforced concrete, Weibull parameters.
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