Effects of Relative Humidity During Curing on Small-Strain Modulus of Cement-Treated Silty Sand

Rizki Maretia Novi Barus, Apiniti Jotisankasa, Susit Chaiprakaikeow, Supakij Nontananandh, Shinya Inazumi, Auckpath Sawangsuriya

Research output: Contribution to journalArticlepeer-review

Abstract

This study investigated the effects of relative humidity (Rh) or total suction condition during curing on small-strain shear modulus (G0) of a cement-treated silty sand using free-free resonant frequency tests (FFR). The moduli were determined on samples cured at different suctions corresponding to three Rh values of 7%, 75%, and 100%, in both unsoaked and soaked conditions. Soil–water retention curves (SWRCs), and unconfined compression strength (UCS) were also determined along with x-ray diffraction (XRD) analysis. The cement-treated SWRCs showed a much flatter slope than the non-treated ones, and the air-entry suction increased with cement content. The values of G0 increased with cement content and curing time. The highest modulus was achieved in 75%Rh curing condition. The 7%Rh condition resulted in a significant drop in modulus, even close to the non-treated G0 for the 2% cement case. At the same UCS value, the soaked cement-treated samples had higher modulus than the non-treated ones in the unsoaked condition, indicating that the effect of suction on modulus was smaller than the effect of cementation. XRD analysis revealed a greater availability of C3S in 7%Rh curing condition at 7-day curing period suggesting that the hydration process was still not complete, which explained the decrease in G0 in this curing condition.

Original languageEnglish
JournalGeotechnical and Geological Engineering
DOIs
Publication statusAccepted/In press - 2020

Keywords

  • Cement-treated soil
  • Free-free resonant frequency method
  • Relative humidity
  • Small-strain shear modulus
  • Total suction

ASJC Scopus subject areas

  • Architecture
  • Geotechnical Engineering and Engineering Geology
  • Soil Science
  • Geology

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