Experimental Study on Ternary Blended Concrete under Elevated Temperatures

Fire is a standout amongst the most dangerous forces to which a building structure can be exposed, frequently presenting concrete elements to high temperatures bringing about deterioration, aggregate fall and total collapse of the structure. The relative properties of cement after such an introduction are of extraordinary significance regarding serviceability of structures. Silica fume (SF) and Metakaolin (MK) have been found to be useful pozzolanic materials in terms of its superior durability, high strength, impermeability, low porosity and resistance to fire. In this paper, the performance behavior of the concrete under elevated temperature extending from 200ºC - 800 ºC with an interim of 200 ºC for duration of one hour was observed and compared with the Ternary Blended Concrete (TBC) concrete containing SF and MK to the control concrete. After exposure to temperature, samples were cooled and the tests such as Compressive strength, Split tensile strength, Ultrasonic pulse velocity test, Acid attack test and Rapid chloride permeability test were conducted and compared with the unheated concrete of all mixes. Taking SF 10% constant for all mixes with varying proportions of MK as 5%, 10%, 15%, 20% as a replacement of cement were studied. Elevated temperature also results with crack formation and increasing target temperature caused more cracks. Test results displayed the concrete containing 10% SF with 15% MK revealed splendid mechanical and durability properties under elevated temperature than other mixes.