Factors affecting bond strength of RC column jackets

Elbakry, Hazem M.F.; Tarabia, Ahmed M.

doi:10.1016/j.aej.2016.01.014

Cited by 23 publications

(10 citation statements)

References 17 publications

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“…Due to the wide variety of bonding agents, every article has different results from others. As reported by Elbakry and Tarabia [9], using of bonding agent instead of other methods, reduces 4% in the strength given by jacketed sample. A small percent like that may be considered unimportant for this test result.…”

Section: Application Of Bonding Agentsmentioning

confidence: 71%

“…The bond strength of specimens was, on average 4.61 times the corresponding bond strength of specimens that roughened by hand-chiseling or sandblasting. It can seem that a high level of surface roughening provided leads to extra friction between the jacket and the column [9].…”

Section: Shear Connectormentioning

confidence: 99%

“…Elbakry and Tarabia [9] studied the effects of surface preparation, the contributions of dowels, and concrete jacket transverse reinforcement on the overall bond strength between new concrete jackets and old concrete. Thus, it concluded that increasing the surface roughness of the substrate concrete by hand-chiseling is considerably more effective than grinding, and the use of steel dowels to connect the new jacket concrete to the old concrete significantly improved the overall bond strength due to the developed shear friction.…”

Section: Fig-15: Load Against Displacement Envelopes For All Specimensmentioning

confidence: 99%

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Review on the Strengthening of Reinforced Concrete Columns by Reinforced Concrete Jacketing

Karim¹,

Fr²

2020

SJCE

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This paper highlights the review of the behavior and strength of strengthening reinforced concrete columns by reinforced concrete jacketing. Even with the fact that on a massive scale, numerous experimental studies on column strengthening with the assistance of reinforced concrete jacketing are performed after which suggested, however, there may be nonetheless an apparent need for locating and executing new approaches to improve the performance of classical RC jacketing. As in the case of RC structure, columns are subjected to uniform and non-stop loading, which increases with the boom in a number of stories and might cause partly damage or even general failure of the column. To overcome the whole failure of RC columns, instant attention is needed in and the broken part of reinforced concrete repaired by way of reinforced concrete jacketing. This paper additionally focuses on the effect of presenting dowel rebar by way of drilling holes and using concrete jackets made with particular types of concrete. The results show that each use of dowel rebar and distinctive kinds of concrete will increase the bond strength, basic load wearing capability, and primary crack load. Critical cases clarified to avoid such as reinforcing limit and form, type and property of concrete, types of surface preparation, and a recommendation for high temperature.

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Section: Application Of Bonding Agentsmentioning

confidence: 71%

Section: Shear Connectormentioning

confidence: 99%

Section: Fig-15: Load Against Displacement Envelopes For All Specimensmentioning

confidence: 99%

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Review on the Strengthening of Reinforced Concrete Columns by Reinforced Concrete Jacketing

Karim¹,

Fr²

2020

SJCE

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“…The scientific community is aware of the importance of the joint between concretes of different ages, or between concrete and repair mortar. In this regard, one could point to the work by Júlio et al [30,31,32,], Qian et al [33], Elbakry and Tarabia [34], and Mousa [35].…”

Section: Introductionmentioning

confidence: 99%

An experimental study on RC columns repaired on all four sides with cementitious mortars

Ortega

Pellicer

Adam

et al. 2018

Construction and Building Materials

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Structural ageing, action by aggressive agents, accidents, etc., all make it increasingly necessary to apply conservation and maintenance programs to building structures. Columns are some of a building's most critical elements, since the failure of a single column can lead to the collapse of the entire structure or a large part of it. Although great strides have been made in recent years in the field of reinforced concrete (RC) column repair and strengthening, there is room for further improvement in certain areas. This paper describes a study carried out in the ICITECH laboratories (Universitat Politècnica de València) on RC columns repaired on all four sides with cementitious-based mortars. A total of 18 specimens were tested, representing a group of square 20x20 mm 2 columns subjected to compressive axial loads. Different repair scenarios were considered in order to study the influence of the type of mortar used and the presence or absence of bonding agents between the mortar and the column concrete. The results obtained showed that bonding agents have no appreciable effect on the behaviour of the repaired columns. Of the two types of mortar used in the study (Classes R3 and R4), the columns repaired with the lower grade mortar (R3) were seen to behave better. The main novelty of this work lies in the fact that this is the first time that two types of mortar are compared in the repair of four column sides, in addition to the possible use of bonding agents between the mortar and the column.

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“…The demand for using concrete jackets to strengthen or repair reinforced concrete columns has been increasing in the past few decades [4]. Reinforced concrete jacketing is a common method for retrofitting existing columns with poor structural performance [5].…”

Section: Structure Strengthening With Concrete Jacketingmentioning

confidence: 99%

Strengthening of Nurul Ilmi Mosque with Concrete Jacketing

Fauzan

Ismail²,

Apriwelni³

et al. 2017

ins

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 Abstract-Nurul Ilmi moesque is one of building for worship located in University of Andalas. In 2008 the new building of mosques was designed using previous indonesian seismic code, SNI 1726: 2002. The right side of the new mosque was constructied in 2009. Due to the limitation of the budget, the construction of the left side of the mosque was continued on 2014. However, a new indonesian seismic code SNI 03-1726-2012 was established and the designed mosque should be revised based on the new indonesian seismic code. Since the right side of the mosque was designed by using the old seismic code (SNI 1726(SNI : 2002, so it is necessary to evaluate the strength of the structure by using the seismic code (SNI 03-1726(SNI 03- -2012. Based on the analysis results, it was found that the right side of the building structure is not strong enough to resist the combination loads acting on the structure, especially the earthquake load. Therefore, it is necessary to strengthening (retrofitting) the right side of the building structure before connecting with the left side of the building. In this study, the concrete jacketing method was used to the retrofit the column structure. The results show that the jacketing method is effective to increase the capacity of the column and reduce internal forces and displacements that occur in the structure of the mosque, so the structure can resist the working loads

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Factors affecting bond strength of RC column jackets

Cited by 23 publications

References 17 publications

Review on the Strengthening of Reinforced Concrete Columns by Reinforced Concrete Jacketing

Review on the Strengthening of Reinforced Concrete Columns by Reinforced Concrete Jacketing

An experimental study on RC columns repaired on all four sides with cementitious mortars

Strengthening of Nurul Ilmi Mosque with Concrete Jacketing

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