Estimation of Strength Development on Solidified Soft Soil Using Bender Elements and X-ray CT Scan Technique

DOI

10.2991/978-94-6463-278-1_16How to use a DOI?

Keywords

Solidified soil; Non-destructive test; Geoenvironmental problem

Abstract

Cement, which can solidify soft soil, not only improves the bearing capacity of poor ground but also contributes to solving various ground environmental issues, including the containment of pollutants. In this regard, the amount of cement added to the soil to achieve the required strength on the construction site is determined based on the results of unconfined compression tests with numerous test specimens. However, due to significant variability in the unconfined compression strength of solidified soil specimens, a considerable safety factor is applied to the strength, resulting in a substantial excess of cement being added compared to the amount necessary to obtain the desired strength. Furthermore, because laboratory tests to determine the amount of cement to be added require a considerable amount of time, there are cases where an empirical approach is used, adding more cement than necessary without conducting laboratory tests. As cement production releases a large amount of carbon dioxide, accurately predicting the unconfined compression strength of cement-improved soil after sufficient curing from short-term tests can not only reduce construction costs but also mitigate the environmental impact. Therefore, in this study, we focused on accurately and rapidly predicting the future strength used in the design of soil structures using two non-destructive tests. As a result, we successfully predicted the future unconfined compression strength using the shear wave velocity obtained from bender element tests. Furthermore, X-ray CT scanning was found to be a valuable test as it not only visualizes the interior of the test specimen but also allows for the assessment of density increase associated with curing, which contributes to the validation of the obtained unconfined compression strength.

Copyright

© 2023 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Enkhzaya Batbayar
AU  - Takayuki Kawaguchi
AU  - Dai Nakamura
PY  - 2023
DA  - 2023/10/29
TI  - Estimation of Strength Development on Solidified Soft Soil Using Bender Elements and X-ray CT Scan Technique
BT  - Proceedings of the Fourth International Conference on Environmental Science and Technology (EST 2023)
PB  - Atlantis Press
SP  - 160
EP  - 171
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6463-278-1_16
DO  - 10.2991/978-94-6463-278-1_16
ID  - Batbayar2023
ER  -