Effect of fly ash cenosphere concrete under elevated temperature.

Abstract

Structural components are subjected to diverse temperatures upon unforeseen building fires. In such instances, the micro-scale and macro-scale engineering characteristic attributes of concrete exert a profound influence upon the composition of the materials involved. This study focused on replacement of fly ash cenosphere as fine aggregate with alccofine as binder. Three mix ratios were adopted and were exposed to an elevated temperature from 200 to 800ºC for a period of 1, 2, and 3 h. Experimental investigations such as thermophysical assessments, weight loss ratio, pore structural analysis, residual compressive strength, and its failure modes are studied. The chemical deterioration behavior was analyzed using scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier transform infrared (FTIR) spectroscopy. From the results, it was observed that the residual compressive strength decreased from 53.18 to 72.50% in CC, 18.13 to 34.33% in FACC, and 17.98 to 29.64% in FACCAF. Hence, addition of fly ash cenosphere and alccofine in the exhibits the resistance to elevated temperature by inducing thermal energy in the concrete matrix and densifies the pore structure of the concrete.