Microstructure investigation of seawater vs. Freshwater cement pastes

Adel Younis, Usama Ebead, Prannoy Suraneni, Antonio Nanni

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Recently, 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.

Original languageEnglish (US)
Title of host publicationISEC 2019 - 10th International Structural Engineering and Construction Conference
EditorsDidem Ozevin, Hossein Ataei, Mehdi Modares, Asli Pelin Gurgun, Siamak Yazdani, Amarjit Singh
PublisherISEC Press
ISBN (Electronic)9780996043762
DOIs
StatePublished - 2019
Event10th International Structural Engineering and Construction Conference, ISEC 2019 - Chicago, United States
Duration: May 20 2019May 25 2019

Publication series

NameISEC 2019 - 10th International Structural Engineering and Construction Conference

Conference

Conference10th International Structural Engineering and Construction Conference, ISEC 2019
CountryUnited States
CityChicago
Period5/20/195/25/19

Keywords

  • Back-scattered electrons
  • Energy dispersive X-ray
  • Scanning electron microscopy
  • Seawater-mixed concrete
  • Secondary electrons
  • Sustainability

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction

Fingerprint Dive into the research topics of 'Microstructure investigation of seawater vs. Freshwater cement pastes'. Together they form a unique fingerprint.

  • Cite this

    Younis, A., Ebead, U., Suraneni, P., & Nanni, A. (2019). Microstructure investigation of seawater vs. Freshwater cement pastes. In D. Ozevin, H. Ataei, M. Modares, A. P. Gurgun, S. Yazdani, & A. Singh (Eds.), ISEC 2019 - 10th International Structural Engineering and Construction Conference (ISEC 2019 - 10th International Structural Engineering and Construction Conference). ISEC Press. https://doi.org/10.14455/isec.res.2019.112