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Dr. Taha Awad Allah El-Sayed Ibrahim :: Publications:

Title:
EFFECT OF RELATIVE RIGIDITY AND INTERFACE CONDITION ON TENSILE BOND STRENGTH OF CONCRETE
Authors: T A El-SAYED , A M ERFAN , R. M. ABD EL-NABY
Year: 2016
Keywords: Relative rigidity (RR), tensile bond strength, multilayer system, surface roughness, adhesive coat, steel connectors, slippage, shear resistance.
Journal: Jokull Journal
Volume: 66
Issue: 9
Pages: 93-121
Publisher: Jokull Journal
Local/International: International
Paper Link:
Full paper TAHA AWAD ALLAH EL-SAYED IBRAHIM_Paper_07.pdf
Supplementary materials Not Available
Abstract:

The important of bond strength of a multilayer concrete system is increased with the increase of the use of the advanced composite materials in the field of repair or strengthening. Experimental and analytical models based on different testing methods are developed in attempt to evaluate the actual bond strength of the system. The most common techniques used to prepare the interfacial bonding surface can be classified into physical, chemical, and mechanical techniques. Analytical and experimental study was conducted to find out the dominant factors that control the tensile bond strength at the interface. The variables were the surface roughness, the chemical coating, and the steel connectors. The experimental study was conducted on 48 specimens which were prepared for the splitting test. The analytical modeling was carried out using ANSYS12.0.1, where 8 different cases of surface conditions were considered. Interface of smooth surface (SS) was used as a reference while the physical bond was expressed in terms of horizontal roughening (HR), vertical roughening (VR) and grid roughening (GR). The mechanical bonding was induced by using mild steel bar (SC1) and high grade steel bar (SC2). The results of the presented research work show the role of the relative rigidity of the mixes on the tensile bond strength. Simplified and reliable formulas were presented to relate the experimental and theoretical tensile bond strength based on the interface condition. The results also show that using the grid roughening (GR) gave the highest value of the tensile bond strength. The case of using the epoxy (EP) gave competitive tensile bond strength values. Good agreement between the experimental and theoretical results and similar trends were observed for the cases (SS), (HR), (VR), (GR) and (AB). Slight differences were found for the cases (EP), (SC1) and (SC2).

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