In this work, tests on concrete built from waste glass and steel slag are presented. Both lightweight aggregate concrete and concrete with limestone aggregate underwent reference testing. Slump, density, elastic modulus, compressive strength, and flexural strength were used to analyse the material characteristics of various kinds of concrete. To examine the impact of aggregate type on the fire performance, fire tests on plain concrete columns with a diameter of 250 mm and a height of 800 mm were carried out. The study's findings show that it is possible to use steel slag and/or waste glass in place of all coarse aggregate or a portion of fine aggregate. Concrete made from steel slag may be made more workable and less dense by adding waste glass. The compressive strength, flexural strength, and elastic modulus of the steel slag concrete were equivalent to or even greater than those of the control limestone aggregate concrete. Only a slight effect on the mechanical qualities of concrete was noticed when coarse aggregate was substituted by up to 17.5% waste glass. Steel slag and waste glass have shown the capacity to increase the fire resistance of concrete due to their superior thermal and/or mechanical qualities.