Abstract
Soils surrounding energy geo-structures are exposed to high temperature and temperature cycles. Such thermal changes may affect the engineering behavior of soils negatively. It is very important that the soils around energy geo-structures maintain its engineering parameters unchanged for a long time under thermal changes. Understanding how barrier is affected when exposed to high temperature is crucial for the long-term performance of the barrier. The aim of study is to keep the soils around the energy geo-structures such as nuclear waste disposal facilities, maintain their engineering characters without failure for a long time under high temperatures and thermal changes. In the present study, sand-bentonite mixtures, which are widely used as a barrier material, and colemanite, one of the boron minerals known for its thermal strength, were used. An experimental study investigated (1) the effect of high temperature (80 °C) on the shear strength (2) the effect of the thermal cycle (20-80-20 °C) on compression of additive free sand-bentonite mixtures and colemanite added sand-bentonite mixtures. The laboratory tests were performed in a temperature-controlled modified shear box and oedometer cell. Based on the results obtained, colemanite additive contributed to the improvement of shear strength of sand-bentonite mixtures at high temperature. However, colemanite addition increased the compression amount and thermal cycling effect reduced the compression index.
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Abbreviations
- 100C:
-
Colemanite
- 10B-90S:
-
Mixture containing 10% bentonite, 90% sand
- 9B-81S-10C:
-
Mixture containing 9% bentonite, 81% sand, and 10% colemanite
- 8B-72S-20C:
-
Mixture containing 8% bentonite, 72% sand, and 20% colemanite
- 20B-80S:
-
20% Sand-bentonite mixture
- 18B-72S-10C:
-
Mixture containing 18% bentonite, 72% sand, and 10% colemanite
- 16B-64S-20C:
-
Mixture containing 16% bentonite, 64% sand, and 20% colemanite
- ϕ′:
-
Internal friction angle
- c′:
-
Cohesion
- τmax :
-
Maximum shear stress
- σv :
-
Vertical stress
- εv :
-
Vertical strain
- Cc :
-
Compression index
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Acknowledgements
This study is supported by The Scientific and Technological Research Council of Turkey (TUBITAK) (Grant no: 217M553). The authors are grateful for this support. The authors would like to thank 100/2000 The Council of Higher Education (YÖK) scholarship.
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This study is supported by The Scientific and Technological Research Council of Turkey (TUBITAK) (Grant no: 217M553).
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by SGA and YeY-A. The first draft of the manuscript was written by SGA and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Alpaydin, S.G., Yukselen-Aksoy, Y. Shear strength and compression behavior of colemanite-added sand-bentonite mixtures under high temperature and temperature cycles. Environ Earth Sci 81, 431 (2022). https://doi.org/10.1007/s12665-022-10554-y
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DOI: https://doi.org/10.1007/s12665-022-10554-y