The effect of iron-steel factory wastes in the Iskenderun region on the strength and durability of concrete

Today, concrete is a building material that is produced and used in large quantities. Likewise, steel is a material that is widely produced and used. Many by-products are formed during steel production. The use of these value-added by-products in the concrete industry as a material is very valuable in terms of economic and environmental sustainability. In this study, it is aimed to contribute to the recycling of concrete production and technology by using waste materials obtained from iron and steel factories operating in Iskenderun region instead of aggregate and cement in concrete. In concrete, instead of aggregate, fine-coarse electric arc furnace slag is at 25%, 50% and 100% by volume; black scale and red scale were used at the rates of 10% and 20%. Instead of cement, flue dust and blast furnace slag 10%, 20% and 30% were changed by weight. Concrete cube samples of 10 × 10 × 10 cm and cylindrical samples of 10 × 20 cm were produced at the specified proportions. A total of 19 different mixtures were designed. The water / cement ratio in the mixtures was kept constant at 0.5 and the binder dosage at 400 kg / m³. Ultrasonic sound velocity test, 7-day and 28-day pressure tests of the produced concrete were performed. Concrete samples were exposed to high temperature (250 C, 500ºC, 750 ºC) for 2 hours and their compressive strength was determined. 28-day samples were exposed to acid and sulphate attack for 30 days and their compressive strength was determined afterwards. Reinforcements with a diameter of 12 mm were placed in the cylindrical samples, and rapid corrosion test was performed on these samples with the setup installed. Constant 12V current was supplied to the fittings for 152 hours. The current flowing through the reinforcement was measured at 8 hour intervals. The results obtained showed that the recycling materials used in the study can be used in certain proportions instead of concrete and aggregate.