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Swelling Behavior of Montmorillonites Noncolloidally Crosslinked with ε‐Al 13
Author(s) -
Yao Hailin,
Liu Liang,
Sun Shiyong,
Fang Ran
Publication year - 2016
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj2016.05.0142
Subject(s) - swelling , montmorillonite , expansive clay , swelling capacity , materials science , chemistry , chemical engineering , nuclear chemistry , soil water , composite material , geology , soil science , engineering
Core Ideas The expansion properties of montmorillonites treated with PHA steeply decreased. A mixture of montmorillonites and PHA solution is not a colloidal system. Al 13 groups are the main intercalator and factor influencing swelling behavior. The treatment may be applied in expansive soil research. Studies concerning noncolloidally crosslinked montmorillonites (NCMs) are significant for the chemical treatment of expansive soil. In this study, NCMs with OH/Al molar ratios of 1.0, 1.5, 2.0, and 2.5 and Al/montmorillonite ratios of 0.1, 0.3, 0.5, 0.8, and 1.0 mmol g −1 were prepared via AlCl 3 –NaOH reactions and subsequent Al 13 –montmorillonite interactions. The resulting NCMs exhibited the characteristics of silt as well as significant expansion and mechanical property changes. The expansion properties of the NCM samples, including the free swelling ratio, swelling force, free expansion ratio, and expansion ratio under 50 kPa all decreased significantly. According to the X‐ray diffraction data, the basal spacing of the NCM samples became relatively stable and slightly expanded after the drying and rewetting processes. Additionally, the cohesive force and shear strength of the NCM samples increased significantly after the crosslinking process. Furthermore, the X‐ray fluorescence spectrometry results confirmed that the Al oxide content of the NCMs increased as the swelling properties decreased, indicating that primarily the Al 13 groups influenced the swelling behavior of the NCMs.