Abstract

Near surface mounted (NSM) is growing exponentially into the strengthening and repair of concrete structures over the past decades worldwide. CFRP NSM offers a superior strength over conventional steel reinforcement as well as a good durability in various environmental service conditions. However, the effect of elevated temperature, adhesiveness and chemicals has not been sufficiently studied. This study aims at assessing the impact of elevated temperatures, adhesives, and chemicals on beams exposed to flexural loading. To meet this objective, a set of 60 beams were prepared with locally available NSM and exposed to temperatures of 70, 120 and 180 °C for 1, 2, 4 and 8 hours. Beams were also evaluated with three levels of adhesiveness placement and were also exposed to five weeks of wetting and drying in fresh water, brine water and magnesium Sulphate. The results of this work reveal that CFRP bars NSM mounted at a depth of 25 mm introduces more than double flexural strength of conventional steel reinforced beams. Exposure to different degree temperature at various duration, placement of adhesive and exposure to chemicals all lead to substantial drop in the flexural strength and thus affect the potential gain of NSM. This study should be resumed by future research work to validate the findings on one hand and to examine the effect of numerous other parameters. Construction industry needs to be aware of the findings of this work to make better use of its implementation in future repair and retrofitting. Keywords: (Near Surface Mounted, Fibre Reinforced Polymer, Repair and Retrofitting, elevated temperature, adhesive, chemicals)

Department

Construction Engineering Department

Degree Name

MS in Construction Engineering

Date of Award

2-1-2016

Online Submission Date

January 2017

First Advisor

Abou-Zeid, Mohamed

Committee Member 1

Ahmed, Ezzeldin

Committee Member 2

Nassar, Khaled

Document Type

Thesis

Extent

96 p.

Rights

The author retains all rights with regard to copyright. The author certifies that written permission from the owner(s) of third-party copyrighted matter included in the thesis, dissertation, paper, or record of study has been obtained. The author further certifies that IRB approval has been obtained for this thesis, or that IRB approval is not necessary for this thesis. Insofar as this thesis, dissertation, paper, or record of study is an educational record as defined in the Family Educational Rights and Privacy Act (FERPA) (20 USC 1232g), the author has granted consent to disclosure of it to anyone who requests a copy. The author has granted the American University in Cairo or its agents a non-exclusive license to archive this thesis, dissertation, paper, or record of study, and to make it accessible, in whole or in part, in all forms of media, now or hereafter known.

IRB

Not necessary for this item

Comments

Unquestionably, I am truly grateful to have Prof. Dr. Mohamed Nagib Abou-Zeid as my advisor. He was more than a common advisor; he was a great guider and supporter. He insisted on flourishing and providing me with his expertise. I am thankful for his patience, and the precious time that he gave me. Also, I am genuinely grateful to have Prof. Dr. Ezzeldin Yazeed who was very generous as usual with his knowledge. He believed in my capabilities and supported me till the end, and I hope I am up to his expectations. Of course, I can’t disregard Mr Fares and all AUC laboratory personnel effort. They were really helpful throughout the thesis. It is of course indispensable to express my absolute appreciation and gratitude to my dearest family. Unfortunately, any amount of appreciativeness and thankfulness won’t be enough. You worked so hard to construct the perfect atmosphere and ambiance in order for me to succeed.

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