Influence of Pore Water Chemistry on Particle Association and Physical Properties of Lime-Treated Bentonite

被引:1
作者
Vitale, Enza [1 ]
Deneele, Dimitri [2 ,3 ]
Russo, Giacomo [1 ]
机构
[1] Univ Naples Federico II, Dept Earth Sci Environm & Resources, Via Cintia 21, I-80126 Naples, Italy
[2] Univ Nantes, Inst Materiaux Jean Rouxel IMN, CNRS, UMR 6502, 2 Rue Houssiniere,BP 32229, F-44322 Nantes 3, France
[3] Univ Gustave Eiffel, GERS LEE, IFSTTAR, F-44344 Bouguenais, France
关键词
sedimentation; pore water chemistry; lime treatment; clay particle interactions; bentonite; microstructure; Atterberg limits; SHEAR-STRENGTH; KAOLINITE; BEHAVIOR; SEDIMENTATION; EVOLUTION; PH; PERMEABILITY; SOIL;
D O I
10.3390/min14080795
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
In the present work, an investigation on the influence of the chemical environment on the sedimentation behaviour of bentonite suspensions is performed with particular reference to the effect of lime addition on the clay particle arrangement. The role of lime content, cation valence and source of calcium ions is considered in the experimental work. At the microscale, particle interaction is analysed by means of zeta potential measurements. Soil fabric formation during sedimentation and its physical properties are inferred from dynamic light scattering measurements, sedimentation tests and Atterberg limits. The addition of cations to pore water promotes the flocculation of montmorillonite particles favouring the formation of particle aggregates, whose dimension depends on ion valence and concentration. The final height of sediments reflects the combined effect of the mutual interactions among particles and the development of secondary phases due to pozzolanic reactions. The influence of clay mineralogy and its effects on the physical properties of lime-treated bentonite is highlighted by comparison with experimental evidence on lime-treated kaolin.
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页数:14
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