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

Abstract

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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Gypsum
Calcium
Portland cement
Sand
Cements
Carbon footprint
Hydration
Compressive strength
Electron microscopes
Scanning
Soils
X ray diffraction

Cite this

Subramanian, S., Moon, S-W., & Ku, T. (Accepted/In press). Effect of Gypsum on the strength of CSA treated sand. In 16th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering

Effect of Gypsum on the strength of CSA treated sand. / Subramanian, Sathya; Moon, Sung-Woo; Ku, Taeseo.

16th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering. 2019.

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

Subramanian, S, Moon, S-W & Ku, T 2019, Effect of Gypsum on the strength of CSA treated sand. in 16th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering.
Subramanian S, Moon S-W, Ku T. Effect of Gypsum on the strength of CSA treated sand. In 16th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering. 2019
Subramanian, Sathya ; Moon, Sung-Woo ; Ku, Taeseo. / Effect of Gypsum on the strength of CSA treated sand. 16th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering. 2019.
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abstract = "The conventional binding admixture for soil, Ordinary Portland Cement (OPC) has higher carbon footprint hence anew 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 reactivityof 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 usedin this study, the gypsum content is varied from 0{\%} to 60{\%} to find the optimum gypsum content. Optimum gypsumcontent is identified as the gypsum content which has higher initial strength and durable rate of strength gain withcuring 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 ofhydration product formed.",
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N2 - The conventional binding admixture for soil, Ordinary Portland Cement (OPC) has higher carbon footprint hence anew 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 reactivityof 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 usedin this study, the gypsum content is varied from 0% to 60% to find the optimum gypsum content. Optimum gypsumcontent is identified as the gypsum content which has higher initial strength and durable rate of strength gain withcuring 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 ofhydration product formed.

AB - The conventional binding admixture for soil, Ordinary Portland Cement (OPC) has higher carbon footprint hence anew 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 reactivityof 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 usedin this study, the gypsum content is varied from 0% to 60% to find the optimum gypsum content. Optimum gypsumcontent is identified as the gypsum content which has higher initial strength and durable rate of strength gain withcuring 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 ofhydration product formed.

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