Early-age properties of cementitious pastes made with seawater

Pavithra Parthasarathy, Asad Hanif*, Zongjin Li

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

This study investigates the early-age hydration reaction between cement hydrates and sea water through setting time, hydration heat measurement, compressive strength, thermal analysis, and microstructure study. The kinetics of hydration up to 3 days were measured using isothermal calorimetry. Microstructure of cement pastes were studied by SEM-EDX. The results indicate that the addition of sea water increases the hydration of C3A and C3S resulting in fast setting time. Seawater improved the cement hydration and increased the early-age strength development. The % increase in strength for seawater samples are 22.35%, 29.84% and 26.51 %, at 1 day, 3 day and 7 days comparatively. The ions present in seawater helps in acceleration of cement hydrates at early age. Friedel's salt, a Cl-AFm phase present in seawater sample, becomes unstable at later ages, followed by decrease in physically adsorbed chlorides. The difference between the seawater and freshwater cement matrix is the presence of sodium, chloride, and sulphates percentage.

Original languageEnglish
Pages (from-to)707-714
Number of pages8
JournalMaterials Today: Proceedings
Volume65
DOIs
StatePublished - Jan 2022

Bibliographical note

Publisher Copyright:
© 2022

Keywords

  • Cement paste
  • Early-age properties
  • Hydration
  • Microstructure
  • Seawater

ASJC Scopus subject areas

  • General Materials Science

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