[en] This article addresses the subject of treating clayey soils to reduce the swelling in this type of soil. The study used a calcium-rich solution and examined the influence of this solution on the <2 μm clay fraction, on the non-clay fraction and on clay soil swelling. The dissolution of clay-fraction minerals during this treatment was also examined. A mineralogical and free-swelling analysis was carried out on three natural clay soils from three different locations in Algeria. The solution rich in Ca ions had a significant influence on clay mineralogy, as all the clay minerals nearly disappeared and only traces of smectite, illite, chlorite and kaolinite remained. The almost complete disappearance of minerals after contact with the Ca solution may be linked to the high pH of the porewater, because an increase in pH accelerates the alteration of these minerals. The pH of the solution induced significant modifications in the samples, revealing the high reactivity of the minerals during this treatment. Furthermore, the treatment allowed for a nearly total reduction of the sensitivity of these soils to water (i.e. swelling).
Disciplines :
Earth sciences & physical geography
Author, co-author :
Benyahia, Sabah; Earth and Universe Sciences Institute, Department of Geology, Mostefa Ben Boulaid Batna 2 University, Fesdis, Algeria ; Natural Hazards and Territory Planning Laboratory, Geology Department, Mostefa Ben Boulaid Batna 2 University, Fesdis, Algeria
Mebarki, Mehdi; Faculty of Science and Technology, Department of Science and Technology, Tamanrasset University, Tamanrasset, Algeria ; Civil Engineering Laboratory, Risks and Soil-Structure Interaction (LGC–ROI), Mostefa Ben Boulaid Batna 2 University, Fesdis, Algeria
Fagel, Nathalie ; Université de Liège - ULiège > Département de géologie > Argiles, géochimie et environnements sédimentaires
Language :
English
Title :
Effect of calcium solution on the mineralogy of the clay fraction and the swelling of clay soils
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