Abstract
Pure clays or sand-clay mixtures with different clay mineral are widely used in liners or vertical barriers of waste landfill, and the pore water was characterized by its high salinity in coastal area. Thus, it is essential to understand the salinity effects on their consolidation behavior. In this study, oedemeter and SEM tests were conducted on four pure clays with different mineralogy. Several aspects of soil behavior, such as compression index, the end of primary consolidation stage and micro-structure, were investigated in view of pore water salinity effect. The results show that higher ionic concentration significantly decreases the compression index Cc and liquid limits (LL) for clays containing montmorillonite. While the period of primary consolidation was shorten under the impact of water salinity. For kaolinite with or without sodium chloride, a similar Cc, LL and the ending time of primary consolidation stage tp were observed. In view of flocculation, the salinity effect on consolidation behavior was interpreted. Increasing in salinity allows a flocculation and particle readjustment at constant water content for montmorillonitic clay. Then, larger inter-particle spaces and effective void ratio increased the permeability and decreased the drainage period, and larger internal frictions decreased the compression index Cc and LL.
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References
Abdullah WS, Alzoubi MS, Alshibli KA (1997) On the physicochemical aspects of compacted clay compressibility. Can Geotech J 34(4):551–559
Bolt GH (1956) Physico-chemical analysis of the compressibility of pure clays. Géotechnique 2(6):86–93
Cerato AB, Lutenegger AJ (2002) Determination of surface area of fine-grained soils by the ethylene (EGME) method. Geotech Test J 25(3):315–321
Di Maio C, Santoli L, Schiavone P (2004) Volume change behaviour of clays: the influence of mineral composition, pore fluid composition and stress state. Mech Mater 36(5–6):435–451
Fan RD, Du YJ, Reddy KR, Liu SY, Yang YL (2014) Compressibility and hydraulic conductivity of clayey soil mixed with calcium bentonite for slurry wall backfill: Initial assessment. Appl Clay Sci 101:119–127
Gajo A, Maines M (2007) Mechanical effects of aqueous solutions of inorganic acids and bases on a natural active clay. Géotechnique 57(8):687–699
Kaya A, Fang HY (2000) The effects of organic fluids on physicochemical parameters of fine-grained soils. Can Geotech J 37(5):943–950
Oren AH, Kaya A (2003) Some engineering aspects of homoionized mixed clay minerals. Environ Monit Assess 84(1–2):85–98
Sridharan A, Rao GV (1975) Mechanisms controlling the liquid limit of clays. In: Proceeding of the Istanbul conference on soil mechanics and foundation engineering, pp 75–84
Ye W-M, Zhang F, Chen Y-G, Chen B, Cui Y-J (2017) Influences of salt solutions and salinization-desalinization processes on the volume change of compacted GMZ01 bentonite. Eng Geol 222:140–145
Yukselen-Aksoy Y, Kaya A, Oren AH (2008) Seawater effect on consistency limits and compressibility characteristics of clays. Eng Geol 102(1–2):54–61
Zhang F, Ye W-M, Chen Y-G, Chen B, Jun Cui, Yu (2016) Influences of salt solution concentration and vertical stress during saturation on the volume change behavior of compacted GMZ01 bentonite. Eng Geol 207:48–55
Zhang T, Yue X, Deng Y, Zhang D, Liu S (2014) Mechanical behaviour and micro-structure of cement-stabilised marine clay with a metakaolin agent. Constr Build Mater 73:51–57
Acknowledgements
This study is supported by Fundamental Research Funds for the Central Universities (Grant lzujbky-2018-8), and the National Natural Science Foundation of China (General Program, Grant Nos. 51378117; 41572280, 41790443, 41525010) and Postgraduate Research & Practice Innovation Program of Jiangsu Province (Grant No. KYCX17-0131).
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Zhang, T., Deng, Y., Xue, H., Zhang, X., Wang, S. (2019). Salinity and Clay Mineralogy Effects on Consolidation Behavior of Pure Clays. In: Zhan, L., Chen, Y., Bouazza, A. (eds) Proceedings of the 8th International Congress on Environmental Geotechnics Volume 2. ICEG 2018. Environmental Science and Engineering(). Springer, Singapore. https://doi.org/10.1007/978-981-13-2224-2_65
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DOI: https://doi.org/10.1007/978-981-13-2224-2_65
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