Experimentally Investigation of Nano Clay Effects on Leaching and Self-healing Process of Cracked Clayey Soils

Document Type : Research Note

Authors

1 Department of Civil Engineering, Engineering Faculty, Ayatollah Borujerdi University

2 Master of science Student, Department of Civil Engineering, Engineering Faculty, Ayatollah Borujerdi University, Borujerd, Iran

3 Department of Engineering Faculty, Ayatollah Borujerdi University

4 Civil Engineering Department, Engineering Faculty, Razi University, Kermanshah, Iran.

Abstract

Compacted clay layers are known as one of the common low impermeable layers used in geotechnical structures. Due to geotechnical properties, these layers damaged through cracks in their lifespan. This research has attempted to improve the workability by using self-healing features of clays. By conducting numerous experimental tests, it has been shown that, by increasing the plasticity index of clays, the pace of crack healing process will be enhanced. Experiments have shown that percentages of Montmorillonite Nano Clay (MNC) are quite effective and reduce the flow rate in the samples, which is a sign of self-healing of the cracks by an NC additive. On this basis, NC can be perfectly used to repairing cracks in clayey soils. The results of this study show that in the sample with 1 mm crack, about 500 milliliters of water pass through the crack in 60 minutes under no pressuring conditions. While, if the sample contains 2 and 5 percent NC, the amount of water passing through the cracks within 60 minutes, will be 40 and 5 ml, respectively. This dramatic reduction for passing water reflects the positive effect of Nano sized grains on the closure of the created cracks. Therefore, it can be concluded that the self-healing process occurs earlier in smaller cracks, because the NC and soil particles can easily touch each other after swelling. Five percent of MNC can insure the cracks closure at 100% density. I

Keywords

Main Subjects


[1] Ghareh, S., Razavian Amrei, S.A., Mojtahed Sistani, S.V. (2016). “Laboratory Study on the Effect of Water Cations Concentrations on the Bojnord Clay Consolidation Process.” Journal of Rehabilitation in Civil Engineering (JRCE), 4(1): 55-62. DOI 10.22075/jrce.2016.491.
[2] Peymanian, B., Dabiri, R. (2020). “Effects of Geofoam Particles on Geotechnical Properties of Clay-dune Sand.” Journal of Rehabilitation in Civil Engineering (JRCE), 8(2): 166-183. DOI 10.22075/jrce.2020.15624.1292.
[3] Varela, H., Barluenga, G., Palomar, I. (2020). “Influence of nanoclays on flowability and rheology of SCC pasts.” Construction and Building Materials. 243: 118285. https://doi.org/10.1016/j.conbuildmat.2020.118285.
[4] Batiaens, W., Bernier, F., Ling Li X. (2007). “Experiments and conclusions on fracturing, self-healing, and self-sealing processes in clays.” Physics and Chemistry of earth. 32: 600-615. https://doi.org/10.1016/j.pce.2006.04.026.
[5] Hikasa, A., Sekino, T., Hayashi, Y., Rajagolopalan, R., Niihara, k. (2004). “Preparation and corrosion studies of self-healing Multi-Layered Nano coatings of silica and swelling clay.” Materials Research Innovations. 8: 84-88. https://doi.org/10.1080/14328917.2004.11784835.
[6] Tang, C-S., Shi, B., Liu, C., Suo, W-B., Gao, L. (2011). “Experimental characterization of shrinkage and desiccation cracking in thin clay layer.” Applied Clay Science, 52: 69-77. https:// doi.org/10.1016/j.clay.2011.01.032.
[7] Wang, J.J., Zhang, H.P., Zhang, L., Liang, Y. (2013). “Experimental study on self-healing of crack in clay seepage barrier.” Engineering Geology, 159: 31-35. https://doi.org/10.1016/j.enggeo.2013.03.018.
[8] Zhang, M., Takahashi, M., Morin, H.R., Endo, H., Esaki, T. (2002). “Determining the hydraulic properties of saturated, low-permeability geological materials in the laboratory.” Advanced in theory and practice, Evaluation and remediation of low permeability, ASTM. 1415: 83-98.
[9] Mitchel JK, Soga K. (2005) “Fundamentals of soil behavior”. John Wiley & Sons, Third edition.
[10] Kadivar, M., Barkhordari, K., Kadivar, M. (2011). “Nanotechnology in Geotechnical Engineering.” Advanced Materials Research, 261: 524-528.
[11] Yantrapalli, S.K., Hari Krishna, P., Srinivas, K. (2019). “A Study on the Influence of Heavy Metals on Crack Intensity Factor and Hydraulic Conductivity of Locally Available Soils.” Indian Geotechnical Journal, 49(2): 184-190. https://doi.org/10.1007/s40098-018-0313-7.
[12] Iranpour, B., Haddad, A., (2016). “The influence of Nano-materials on collapsible soil treatment.” Engineering Geology. 205: 40-53. https:// doi.org/10.1016/j.enggeo.2016.02.015.
[13] Zomorodian, S.M.A., Moghispour, S., Soleymani, A., Brendan, C. (2017). “Strength enhancement of clean and kerosene-contaminated sandy lean clay using nanoclay and nanosilica as additives.” Applied Clay Science. 140: 140-147. https:// doi.org/10.1016/j.clay.2017.02.004.
[14] Kakuturu, S., Reddi, L.N., (2006). “Evaluation of the parameters influencing self-healing in earth dams.” Journal of Geotechnical and Geoenvironmental Engineering.132: 879-889. https:// doi.org/10.1061/(ASCE)10900241(2006)132:7(879).
[15] Kalhor, A., Ghazavi, M., Roustaei, M., (2019). “Influence of nano-SiO2 on geotechnical properties of fine soils subjected to freeze-thaw cycles.” Cold Regions Science and Technology. 161: 129-136. https:// doi.org/10.1016/j.coldregions.2019.03.011.
[16] Changizi, F., Haddad, A. (2016). “Effect of Nano-SiO2 on the Geotechnical Properties of Cohesive Soil.” Geotechnical and Geological Engineering. 34: 725-733. https://doi.org/10.1007/s10706-015-9962-9.
[17] Abbasi, N., Farjad, A., Sepehri, S. (2018). “The Use of Nanoclay Particles for Stabilization of Dispersive Clayey Soils.” Geotechnical and Geological Engineering. 36: 327-335. https:// doi.org/10.1007/s10706-017-0330-9.
Volume 9, Issue 1 - Serial Number 21
February 2021
Pages 71-83
  • Receive Date: 28 January 2020
  • Revise Date: 05 August 2020
  • Accept Date: 20 August 2020
  • First Publish Date: 01 February 2021