Strength and Deformation Responses of Biocemented Sands Using a Temperature-Controlled Method
Publication: International Journal of Geomechanics
Volume 19, Issue 11
Abstract
The strength and deformation responses of sands improved by a temperature-controlled biotreatment method were investigated through a series of drained triaxial compression tests under various confining pressures. The proposed temperature-controlled biotreated method was capable of producing a nearly homogeneous calcite distribution along the specimen length. For a given confining pressure, the peak-state strength, maximum dilatancy, and secant modulus at 50% of the peak-state strength, which were determined by the bonding between sand grains, increased with increasing calcite content. The residual-state strength, which was dependent on the surface roughness of the sand grains, initially decreased as the calcite increased to 1.8% and then increased as the calcite content increased further. This finding was validated by scanning electron microscope (SEM) images, which showed that increasing the calcite content to 1.8% led to a decrease in the sand grain surface roughness and that further increasing the calcite content resulted in greater sand grain surface roughness.
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Acknowledgments
The authors would like to acknowledge the financial support received from the National Science Foundation of China (Grant No. 51678094, Grant No. 41831282, and Grant No. 51578096), and the China Postdoctoral Science Foundation (Grant No. 2017T100681).
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© 2019 American Society of Civil Engineers.
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Received: Jan 8, 2019
Accepted: Apr 9, 2019
Published online: Sep 11, 2019
Published in print: Nov 1, 2019
Discussion open until: Feb 11, 2020
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