The mineral admixtures added to concrete are beneficial because of its microfilling effect, workability enhancement, strength improvement etc. Fly ash and silica fume have high fineness, which decreases the porosity and pore size and increases the compressive strength. In this…
The mineral admixtures added to concrete are beneficial because of its microfilling effect, workability enhancement, strength improvement etc. Fly ash and silica fume have high fineness, which decreases the porosity and pore size and increases the compressive strength. In this study, self compactingconcrete (SCC) beamsmadewithandwithoutmineraladmixtureshavebeensubjectedto variable amplitude fatigue loading and the response of the specimen is recorded by data acquisition system. The fatigue loading is applied in 0.5 kN increments after every 500 cycles. It is found that the addition of fly ash and silica fume slightly increase the fatigue life of SCC. The validity of Paris law for SCC is verified and Paris law coefficients m and C are determined for all the three SCC. Scanning electron microscopy (SEM) and microindentation techniques are also used to study the fracture processes in self compacting concrete. The SEM micrographs reveal that the damage has been taken place mainly through aggregates.