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AuthorYounis, Adel
AuthorEbead, Usama
AuthorSuraneni, Prannoy
AuthorNanni, Antonio
Available date2020-08-12T09:32:57Z
Publication Date2019
Publication NameISEC 2019 - 10th International Structural Engineering and Construction Conference
ResourceScopus
URIhttp://hdl.handle.net/10576/15488
AbstractRecently, seawater has emerged as viable mixing water for concrete, especially in the case of non-reinforced concrete applications or with the use of non-corrosive reinforcement. Previous studies concerning seawater-mixed concrete mostly revealed an initial slight increase in its strength performance (i.e., till Day 14 following mixing), followed by a strength reduction of 7 15% (i.e., after 28 days or longer) as compared to the conventional freshwater-mixed concrete. With an attempt to explain such observations, this paper aims at comparing the microstructure of freshwater- and seawater-mixed cement pastes. Scanning electron microscopy was utilized to observe the microstructure of freshwater and seawater pastes at Days 3 and 28 following mixing. At Day 3, seawater paste was observed to have more densified microstructure as compared to that of the freshwater counterpart, resulting in relatively higher strength performance. At Day 28, the microstructure was almost similar for the two cement pastes. However, seawater paste was observed to have salt impurities as a result of seawater ions, which possibly cause a slightly lower strength performance as compared to the freshwater paste.
SponsorThis paper was made possible by the NPRP grant # NPRP 9-110-2-052 from the Qatar National Research Fund (a member of Qatar Foundation). The findings achieved herein solely the responsibility of the authors. Special thanks are due to Readymix Qatar (as a part of LafargeHolcim) for providing the expertise that greatly assists the authors in their research.
Languageen
PublisherISEC Press
SubjectBack-scattered electrons
Energy dispersive X-ray
Scanning electron microscopy
Seawater-mixed concrete
Secondary electrons
Sustainability
TitleMicrostructure investigation of seawater vs. Freshwater cement pastes
TypeConference Paper
dc.accessType Abstract Only


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