Bentonite ƙasa ce ta ƙasa mai ƙarfi, mai ƙarfi, wacce ta ƙunshi montmorillonite, wacce ke ƙara girma sosai lokacin ruwa. Wannan ƙasa ce ta asali ta aluminosilicate an cire ta daga bentonitic deposits kuma an sarrafa ta zuwa darussa daban-daban don amfanin geotechnical na musamman. Sifa na musamman na ƙarfin ƙarfe, ƙarancin permeability, da sifa na viscosity na sa a zama ɓangare mai mahimmanci a cikin gini na deep foundation, diaphragm wall installation, da ground stabilization projects a duk duniya.
Sodium bentonite ɗan ma'adinin ƙasa ne mai kunshe da montmorillonite, wanda aka samu daga laka daga volcanic ash. Ma'adinin ya ɗauke da ƙarfin ɗaukar ruwa, ƙarfin fadada, sannan kuma ya na da sifa na plastic. Idan aka marinashe shi, ƙananan sodium bentonite suna fadada zuwa kama da yawa a kiyasin volume ɗin su na kaura, wanda ke haifar da ruwan guba mai ƙarfi da ƙarfin gel. Tsarin ma'adinin ya haɗa da canjin sodium ions wanda ke sauƙaƙa hydration da dispersion, wanda ke bambanta shi da calcium bentonite da sauran variants na ƙasa. Wadannan sifofi na asali suna sa sodium bentonite ya zama dole aikin gine-gine na geotechnical da deep foundation.
Calcium bentonite ɗan ma'adinin ƙasa ne mai kunshe da montmorillonite, wanda aka sifa shi da ƙarfin ɗaukar ruwa da sifa na fadada. Duna da sodium bentonite, wanda ke da alkali-activation, calcium bentonite ya riƙe calcium-exchangeable cations, wanda ke haifar da ƙarancin viscosity da sifa na rheological. Tsarin ma'adinin ya bar ruwan molecules ya shiga tsakanin clay platelets, wanda ke haifar da ƙarfin fadada idan aka marinashe shi. Wannan tsarin ma'adinin ya sa calcium bentonite ya dace musamman ga aikin gine-gine na geotechnical da deep foundation inda ake buƙatar hydration da ƙarancin viscosity.
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