Effect of Gypsum on the strength of CSA treated sand

Sathya Subramanian, Sung-Woo Moon, Taeseo Ku

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


The conventional binding admixture for soil, Ordinary Portland Cement (OPC) has higher carbon footprint hence a
new cement type namely Calcium sulfoaluminate (CSA) cement is examined as an effective alternate for OPC.
Ye’elimite is the major constituent of CSA cement. The hydration of ye’elimite depends on the amount and reactivity
of gypsum present. Depending on the amount of gypsum present, either monosulfate or ettringite is formed.
Unconfined compressive strength (UCS) is used to measure the effectiveness of cementation. Since pure CSA is used
in this study, the gypsum content is varied from 0% to 60% to find the optimum gypsum content. Optimum gypsum
content is identified as the gypsum content which has higher initial strength and durable rate of strength gain with
curing time. The results are then compared against OPC treated sand to examine CSA as an effective alternate for OPC.
Scanning electron microscope (SEM) images and X-ray diffraction (XRD) technique are used to identify the type of
hydration product formed.
Original languageEnglish
Title of host publication16th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering
Publication statusAccepted/In press - Oct 2019

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