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AuthorBarham, Wasim S.
AuthorIrshidat, Mohammad R.
AuthorAwawdeh, Abdelrahman
Available date2024-04-17T11:11:03Z
Publication Date2021-04-16
Publication NameKSCE Journal of Civil Engineering
Identifierhttp://dx.doi.org/10.1007/s12205-021-0904-1
CitationBarham, W. S., Irshidat, M. R., & Awawdeh, A. (2021). Repair of Heat-Damaged RC Beams Using Micro-concrete Modified with Carbon Nanotubes. KSCE Journal of Civil Engineering, 25(7), 2534-2543.
ISSN1226-7988
URIhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85104523070&origin=inward
URIhttp://hdl.handle.net/10576/53951
AbstractThis paper investigates the use of micro-concrete modified with carbon nanotubes (CNTs) for the repair of heat-damaged reinforced concrete (RC) beams. Ten RC beams were cast and then subjected to elevated temperature of 550ºC for two hours. The damaged beams were then repaired using micro-concrete integrating CNTs and tested under four-point bending. Different factors were taken into consideration in this research: CNTs modification, depth of repair, aggregate size of the repair material, and curing period. The repair material was applied on the tension side of the beam. Test results showed that micro-concrete with a larger aggregate size was more effective as a repair material than smaller sized aggregate micro-concrete. CNTs modification had little impact on the flexural strength of the repaired beams, but clearly enhanced the stiffness. The increase in the repair depth improved the strength recovery of the repaired beams but did not influence the failure mode. Curing period of the repaired beams significantly affected their stiffness but not their ultimate load and toughness. To investigate the mineral composition of repair material, scanning electron microscopy (SEM) was conducted for the micro-concrete with and without CNTs modified cementitious. The SEM image showed the CNTs are uniformly dispersed in the cement matrix. The CNTs and the products of the hydration process formed a meshwork structure. The CNTs acted as fillers to the voids, leading to an increase in the compressive strength.
Languageen
PublisherKorean Society of Civil Engineers
SubjectCarbon nanotubes
Heat-damage
Micro-concrete
RC beam
Repair
SEM Imaging
TitleRepair of Heat-Damaged RC Beams Using Micro-concrete Modified with Carbon Nanotubes
TypeArticle
Pagination2534-2543
Issue Number7
Volume Number25
ESSN1976-3808
dc.accessType Full Text


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