Effect of gypsum and cement content on unconfined compressive strength of soft sediment

Masoud Janbaz, Lauren Iacobucci, Kelly Francisco, Robert Miskewitz, Masaki Kitazume, Ali Maher

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


This study investigates the impact of gypsum and Portland cement as binding agents on the stabilization of soft sediment. Eight combinations of gypsum and Portland cement were studied to identify the optimum gypsum content for a total binder content of 8% (by wet weight of sediment). Samples were cured for 7 and 28 days at high and low temperatures (4°C and 20°C). Unconfined compressive strength and moisture content were measured to assess the effectiveness of each mixing condition on soil engineering properties. The results of the study show that the inclusion of gypsum in mixtures of Portland cement and soft sediment can significantly enhance the strength gain of stabilized sediment. The optimum mixture was identified as 1.4% gypsum and 6.6% Portland cement (of the total mass of sediment). This combination produced a 50% increase in strength when compared to a standard 8% Portland cement mixture.

Original languageEnglish (US)
Pages (from-to)373-378
Number of pages6
JournalInternational Journal of Geotechnical Engineering
Issue number3
StatePublished - 2021

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Geotechnical Engineering and Engineering Geology
  • Soil Science


  • Dredging
  • and reclamation
  • and testing of materials
  • ground improvement
  • strength


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