Tensile Strengths and Size Effects of Biocemented Sands
Publication: International Journal of Geomechanics
Volume 24, Issue 5
Abstract
Biocementation has broad application prospects for reinforcing granular materials in geotechnical engineering. However, only few studies have been conducted on the size effect in biocemented granular materials, despite the recognition of the size effect in the uncemented ones. In this study, a series of tests on Brazilian tensile strengths were carried out for biocemented sand, focusing on the size effect. Glass bead sand (GBS) and calcareous sand (CCS) of five different particle sizes were adopted at two different biocementation levels. Under otherwise identical conditions, the tensile strengths of biocemented CCS specimens were higher than that of the biocemented GBS specimens. The tensile strengths of the biocemented specimens decreased with an increase in particle size, which can be captured by a power function, inspired by the size–effect relation. The novel findings of this study can provide the size–effect function for the establishment of constitutive models and the data basis for the validation of numerical models when theoretical models are necessary in predictions of deformation and failure for field-scale biotreated soils.
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Data Availability Statement
All data, models, and codes generated or used during the study appear in the published article. The dynamic images or videos of the Brazilian tensile tests, the scanning electron microscope images, the additional data used for validation, the possible range of fitting parameters, and the detailed calculations of the size–effect tensile strengths for biocemented GBS and CCS sand specimens are available from the corresponding author upon reasonable request.
Acknowledgments
The authors would like to acknowledge the financial support from the National Nature Science Foundation of China (Grant No. 52108303), the China Postdoctoral Science Foundation (Grant No. 2021M693741), and the Natural Science Foundation of Chongqing, China (Grant No. cstc2020jcyj-bshX0111). The authors thank Dr. G. Ma for the help in the preparation of the bacterial solution, cementation solution, biotreatment protocols, and tensile strength tests. In addition, the authors also thank Dr. J. Shi for the great assistance in discussions of the potential application of the test data in constitutive and numerical models during the preparation of the main text.
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International Journal of Geomechanics
Volume 24 • Issue 5 • May 2024
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© 2024 American Society of Civil Engineers.
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Received: Jun 21, 2023
Accepted: Nov 5, 2023
Published online: Feb 29, 2024
Published in print: May 1, 2024
Discussion open until: Jul 29, 2024
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