Comparative study on structural behavior of RC beam under static load using fly ash from micro to nano scale

ABSTRACT

Researchers are working towards achieving the good strength, finding sustainable material, high performance; improve the structural & durability behaviour etc., of the concrete. This study focuses on the analysis and benefits of addition of raw (RFAC), ultra fine (UFFAC) and nano fly ash (NFAC) on its optimum level in the concrete. The optimum content of raw, ultra fine and nano fly ash is 19%, 22% & 23% are obtained through mechanical properties tests. To find the flexural performance of reinforced concrete beam, the specimen of 2000 mm*100 mm*150 mm has been designed to with stand the load of 35kN. Under the static load, the parameters of load vs. mid span deflection, moment vs. rotation, ductility, energy absorption are calculated and all the results were compared with conventional (CC) specimen. Among all the specimens, NFAC specimens have performed well and the minor cracks are developed due to its high bond between the ingredients. The load carrying capacity of the NFAC specimen has been improved about 9.23%, 8.64% and 5.20%, the deflection has been reduced by 12.32%, 9.70% and 1.63%, also the moment carrying capacity of the NFAC specimen has been improved by 19.66%, 12.90% and 5.26% with respect to CC, RFAC and UFFAC specimens.

Keywords:
Raw flay ash; Ultra fine fly ash; Nano fly ash; Scanning Electron Microscope (SEM); Static load; ductility; Energy absorption