University of Khartoum

Characterization and Utilization of Sudanese Arc Furnace Slag from Giad Company in Mortar and Concrete Mixes

Characterization and Utilization of Sudanese Arc Furnace Slag from Giad Company in Mortar and Concrete Mixes

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Title: Characterization and Utilization of Sudanese Arc Furnace Slag from Giad Company in Mortar and Concrete Mixes
Author: Ahmed, Safa Abdelmelik M. Ali
Abstract: The objective of this study was to characterize the locally produced Electric Arc Furnace Slag (EAFS), that is produced by Giad Company for Industries and to determine the degree of its Pozzolanicity and to explore the possibility and feasibility of using this industrial waste as a cement replacement in concrete mixes. Different percentages of cement replacement with the slag had been studied (20%, 30%, 40% and 50%), for two different grades of concrete (25MPa and 35MPa). Chemical and physical properties of the slag were studied in accordance to the international standards viz. American Society for Testing and Materials American (ASTM), American Concrete Institute (ACI) and British Standard (BS). Chemical analysis showed that locally produced steel slag contains high amount of iron due to iron purification process in steel manufacturing compared to the standard (ACI 233). Characteristics such as fineness, loss on ignition and X-ray diffraction test (XRD) of raw materials were tested. Also, consistency test, initial and final setting times and strength test of cement and mortar were conducted according to the standard procedures. XRD results showed the existence of non crystalline silica which indicated good pozzolanicity of the slag. It was found that the degree of pozzolanicity of the slag was about 83.4% at 28 days, which indicated a promising slag quality. Compressive strength test of mortar samples in 2, 7, 14 and 28 days with different percentages of electric arc furnace slag (0%), 20%, 30%, 40% and 50%) had been conducted. Several tests on concrete in a hardened state such as compressive strength, flexural strength, tensile strength, modulus of elasticity, ultrasonic pulse velocity and rebound hammer tests were also carried out for both grades of concrete v and all slag percentages. In addition, the effect of slag content on fresh state of concrete was also observed. It was found that increasing the slag content had increased the slump of concrete. It was also noted that the greater the proportion of steel slag in the mixture, the less compressive strength especially in the early days (early age of concrete) but the strength increases with the increase in the time period (long term strength).Strength and elasticity tests for grade 35MPa concrete were greater than those of grade 25MPa. It was concluded that the optimum replacement percentage of the cement with the steel slag is 20% for all fresh and hardened properties. Results of NDT tests demonstrated that the slag concrete has a good quality as classified according to international standards (ASTM C805 and ASTM C597). These high quality levels indicated that the long term behavior and durability of slag concrete will be promising. Finally, the study proved the efficiency and feasibility of using one of the industrial wastes as a cement replacement in concrete industry in Sudan.
URI: http://khartoumspace.uofk.edu/123456789/25232


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