TY - JOUR
T1 - Time-Dependent Variations of Compressive Strength and Small-Strain Stiffness of Sands Grouted with Microfine Cement
AU - Yoon, Boyoung
AU - Lee, Woojin
AU - Lee, Changho
AU - Choo, Hyunwook
N1 - Funding Information:
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning (2018R1A2B6000973).
Publisher Copyright:
© 2020 American Society of Civil Engineers.
PY - 2020/4/1
Y1 - 2020/4/1
N2 - Unconfined compressive strength (qucs) and maximum shear modulus (Gmax), which are essential properties of grouted sands for quality control and stable design, exhibit a nonlinear behavior with curing time that makes it difficult to estimate the long-term qucs and/or Gmax. This study investigates the applicability of the hyperbolic model to capture the nonlinear development of qucs and Gmax of grouted sands relative to curing time, with the ultimate goal of estimating the long-term qucs. Three sands with varying particle sizes were grouted with microfine cement at three different water-to-cement ratios (W/C=1, 1.5, and 2), after which unconfined compression tests and bender element tests were performed according to curing time. The results of this study demonstrate that the hyperbolic model can effectively capture the time-dependent variations of both qucs and Gmax of the tested grouted sands. Investigation of the hyperbolic coefficient k of the tested materials reveals that the sand particle size and W/C affect the required curing time for completion of the hydration process, and relatively constant Gmax values can be obtained at a relatively earlier curing time compared with qucs. Finally, the direct relationship between qucs and Gmax is investigated in this study.
AB - Unconfined compressive strength (qucs) and maximum shear modulus (Gmax), which are essential properties of grouted sands for quality control and stable design, exhibit a nonlinear behavior with curing time that makes it difficult to estimate the long-term qucs and/or Gmax. This study investigates the applicability of the hyperbolic model to capture the nonlinear development of qucs and Gmax of grouted sands relative to curing time, with the ultimate goal of estimating the long-term qucs. Three sands with varying particle sizes were grouted with microfine cement at three different water-to-cement ratios (W/C=1, 1.5, and 2), after which unconfined compression tests and bender element tests were performed according to curing time. The results of this study demonstrate that the hyperbolic model can effectively capture the time-dependent variations of both qucs and Gmax of the tested grouted sands. Investigation of the hyperbolic coefficient k of the tested materials reveals that the sand particle size and W/C affect the required curing time for completion of the hydration process, and relatively constant Gmax values can be obtained at a relatively earlier curing time compared with qucs. Finally, the direct relationship between qucs and Gmax is investigated in this study.
KW - Hyperbolic model
KW - Maximum shear modulus
KW - Microfine cement
KW - Time dependency
KW - Unconfined compressive strength
UR - http://www.scopus.com/inward/record.url?scp=85078503536&partnerID=8YFLogxK
U2 - 10.1061/(ASCE)GT.1943-5606.0002207
DO - 10.1061/(ASCE)GT.1943-5606.0002207
M3 - Article
AN - SCOPUS:85078503536
VL - 146
JO - Journal of Geotechnical and Geoenvironmental Engineering - ASCE
JF - Journal of Geotechnical and Geoenvironmental Engineering - ASCE
SN - 1090-0241
IS - 4
M1 - 06020001
ER -