Department of Civil Engineering
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Browsing Department of Civil Engineering by Author "Aghi, Anas"
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Item INVESTIGATION OF WASTE FOUNDRY SAND MODIFIED POLYMER CONCRETE AS A RAPID REPAIR MATERIAL(2022-01-21) Aghi, Anas; Akış, Tolga; Şengönül, Cemal MerihPortland cement concrete (PCC) is a material composed of Portland cement, gravels, sand, and water and used for construction purposes. When it is damaged due to fire, sulfate attacks, or seismic forces, polymer concrete (PC) is one good candidate as a rapid repair material for PCC. PC is a material that consists of aggregates and a thermosetting resin as a binder. This present study investigates a special kind of PC composed of waste foundry sand (WFS), epoxy resin, and rice husk ash (RHA) as a repair material for PCC. In addition, the effect of surface roughness of PCC surface was investigated by applying different levels of artificial roughness on PCC substrates using various roughening techniques. Several mechanical tests, such as slant shear, splitting tension and bi-surface shear tests were performed in order to determine the bond strength between PCC and PC for four levels of substrate surface roughness. The surfaces were classified according to their roughness level as (a) smooth surfaces, (b) wire-brushed surfaces, (c) hole-drilled surfaces, and (d) sand-blasted surfaces. Overall, three types of failures namely, adhesive, cohesive and mixed failures were observed. It was found that not only the total surface roughness area but also the geometry of the roughness feature has an effect on the bond strength depending on the type of the applied stress and its direction. Furthermore, almost in all tested specimens, major or minor cracks were observed in PCC part and that reflects the significance of adhesive strength of the PC to the substrate.