ABSTRACT
In total, five different mixes were made and tested; four lightweight (LW) and one normal-weight (NW). The prism specimens were tested according to the ISO-834 (International Standard Organization) temperature curve (CEN). Another high temperature test, referred to as the characterization test, was performed on cylindrical and prismatic specimens. The cylindrical specimens were heated at 1◦C/min until 400◦C. At 400◦C, constant temperature was maintained for 1 hour before cooling (RILEMTC-129 MHT 1996).The prismatic specimens were also heated at 1◦C/min until 500◦C, with a temperature held constant for 1 hour. The ISO-834 test is conducted to study the resistance of the concrete specimens to spalling and cracking when subjected to fire. The characterization test is conducted to study the residual strength of specimens subjected to high temperature. The mechanical properties were evaluated after the heating-cooling cycles on the specimens. The compressive strength, flexural strength, residual strength, porosity, density, mass
loss and physicochemical changes were evaluated after heating and compared to unheated specimens.
