Abstract
Chloride-induced corrosion of reinforcement has endangered the safety of reinforced concrete (RC) structures. It is, therefore, necessary to strengthen the corroded RC members to ensure structural safety. This study aims to investigate the effectiveness of alkali-activated slag (AAS) ferrocement jackets in strengthening corroded RC columns. AAS ferrocement specimens with various layers of stainless steel wire mesh (SSWM) were subjected to direct tensile tests. Square RC columns suffered artificially accelerated corrosion and were subsequently strengthened by AAS ferrocement jackets. Axial compressive tests were conducted on the column specimens. Experimental results have shown that corroded specimens suffer severe losses in loading capacity up to 46% as compared with the control one. Volume fraction of transverse SSWM (ρv) plays primary role in loading capacity and ductility of ferrocement and its confinement on column specimens. Ferrocement with ρv of 0.266% can rehabilitate loading capacity of specimens with corrosion degrees of 8.9% and 18.3% by 37% and 46%, respectively. Corroded specimen strengthened by ferrocement with ρv of 0.532% achieves approximately two times the ductility than the one without strengthening. Ferrocement jackets provide better and uniform confinement to core concrete than new stirrups. Analytical models are proposed to predict tensile strength of AAS ferrocement and loading capacity of specimens strengthened by ferrocement jackets. The prediction is in good agreement with experimental results.
Highlights
Corrosion of reinforcements has become a primary cause of degradation of reinforced concrete (RC) structures in corrosive environments (Roberge, 1999)
fiber-reinforced polymer (FRP) strengthening is generally achieved by wrapping columns or bonding the tensile region of beams and slabs
This study turns to focus on the influence of activated slag (AAS) ferrocement jackets in axial compressive performance of corroded RC columns
Summary
Corrosion of reinforcements has become a primary cause of degradation of RC structures in corrosive environments (Roberge, 1999). The strengthening effectively improved loading capacity and ductility, and reduced mid-span deflection of beams This strengthening method, does not consider durability of steel jackets in chloride-contaminated environment. FRP strengthening is generally achieved by wrapping columns or bonding the tensile region of beams and slabs It can significantly enhance loading capacity and seismic performance of corroded members (Tastani and Pantazopoulou, 2004; Triantafyllou et al, 2017). This study turns to focus on the influence of AAS ferrocement jackets in axial compressive performance of corroded RC columns. RC column specimens were subjected to artificially accelerated corrosion and subsequently strengthened by wrapping core concrete with AAS ferrocement jackets. AAS ferrocement jackets were used to enhance compressive performance of corroded columns by their confinement to core concrete.
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