Using alkali-activated slag ferrocement to strengthen corroded reinforced concrete columns

Fang, Shuai; Lam, Eddie Siu-Shu; Wong, Wing Ying

doi:10.1617/s11527-016-0915-4

Cited by 11 publications

(2 citation statements)

References 20 publications

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“…Also, the utilization of industrial waste can be beneficial to the environment such as using the alkali-activated slag (AAS) in ferrocement jacketing for strengthening the specific type of building which are reinforced concrete buildings in the coastal areas where the corrosion of reinforcement is very high and dangerous. It concluded that the strengthened corroded columns by AAS ferrocement have an increment in their loading capacities and ductility such that it recovered 97 % of the original level of their capacities [20].…”

Section: Ferrocementmentioning

confidence: 99%

Study on Retrofitting of RC Column Using Ferrocement Full and Strip Wrapping

Balamuralikrishnan

Madhani

2019

Civ Eng J

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Ferrocement is one of the cement-based composites used for retrofitting and rehabilitation among many applications. Ferrocement is one of the reinforced concrete form with lightweight and thin composite with durability and environmental resistant that strengthen the conventional RC columns to increase its strength and serviceability. This paper examines the performance of the ferrocement wrapping in RC columns experimentally with numerical simulation using ANSYS19. Totally sixteen number of RC column of size 150 mm × 150 mm in cross section and 450 mm in length were cast and tested in laboratory. Twelve are retrofitted columns with respect to volume fraction and wrapping technique. Six columns were retrofitted by full wrapping technique and six columns of strip wrapping technique. The remaining four columns are control columns in virgin condition to compare with the retrofitted columns. Concerning the volume fraction of each specimen, the number of pre-woven mesh layers were single layer, double layer and three layers. C30 concrete grade adopted in all specimens as per ACI Committee 211-1.91 with 4H8 longitudinal reinforcement and H6 of 75mm c/c ties. As the previous researchers examined the ferrocement and proved its efficiency. This study aims to examine the ferrocement in full and strip wrapping technique to compare their efficiency to increase the strength. Finite element analysis using ANSYS19 adopted to compare the experimental data with the numerical simulation. The results are analyzed and observed that the ferrocement has increased the confinement and strength of the RC columns.

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Section: Ferrocementmentioning

confidence: 99%

Study on Retrofitting of RC Column Using Ferrocement Full and Strip Wrapping

Balamuralikrishnan

Madhani

2019

Civ Eng J

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“…With advantages of excellent mechanical behavior, durability, and environment-friendliness, AAS-based ferrocement has exhibited its tremendous potential in strengthening corroded RC columns in previous studies. The strengthened columns obtained significant rehabilitation in both loading capacity and ductility under various levels of eccentricity (Fang et al, 2017). This study turns to focus on the influence of AAS ferrocement jackets in axial compressive performance of corroded RC columns.…”

Section: Introductionmentioning

confidence: 99%

Axial Compressive Performance of Corroded Concrete Columns Strengthened by Alkali-Activated Slag Ferrocement Jackets

Fang

2020

Front. Mater.

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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 (ρ v) plays primary role in loading capacity and ductility of ferrocement and its confinement on column specimens. Ferrocement with ρ v 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 ρ v 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.

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