Experimental Investigation of the Effect of Steel Slag Aggregate on the Bond Strength of Reinforced Concrete Member
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Date
2022-01
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Addis Ababa University
Abstract
The demand of concrete has increased due to expand of the construction industry. To protect the natural concrete making materials and to sustain the environment, reused of waste products as ingredients of concrete is becoming an inevitable option. From those Steel slag was selected due to its properties, which has almost similar properties to natural coarse aggregate, and it is easily accessible as a by-product from steel production industry. The mechanical property of the concrete with steel slag aggregate has been studied in different literatures. However, literature is limited on the bond behavior of steel slag concrete with steel bar. In this research, the effect of steel slag aggregate on the bond strength of reinforced concrete was investigated experimentally using cylindrical specimens (300 mm ×150 mm) with centrally embedded 12 mm, 14 mm and 16 mm deformed bar. The bond strength test was conducted with pullout test on short embedment length (5db) for 45 specimens. A total of five concrete mixes with 25% interval replacement of steel slag aggregate as coarse aggregate was carried out up to fully replaced for the normal strength concrete C-30. In addition to the bond strength test compressive and splitting tensile strength of the concrete were studied by using (150 mm size cube) and (300 ×150 mm) cylinder, respectively. Experimental test results shows that the compressive strength and splitting tensile strength of concrete increased up to 50% replacement of coarse aggregate by steel slag aggregate, and also the ultimate bond strength was increased up to 50% replacement. For all bar diameters, fully replaced steel slag aggregate concrete has compatible bond strength value with control concrete. On the other hand as the bar diameter increased the bond strength decreased due to the decrement of concrete cover. Additionally, this study proposed an empirical equation for ultimate bond strength based on the experimental results. ACI 318 and ESEN 1992 1 codes are more conservative and underestimated the bond strength values of all specimens.
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Keywords
Steel Slag Aggregate, Bond Strength, Pullout Test, Bar Diameter