COMPATIBILITY OF TROPICAL SOIL AND BENTONITE MIXTURES SUBJECTED TO CHEMICAL SOLUTIONS
Tropical soils cover vast regions of the globe and have great potential to be use as compacted clay liner in waste disposal facilities. When required, bentonite clay can be added to these soils so as to improve their hydraulic properties and contaminant retention capacity. One of the important issues to be addressed when evaluating bentonite as addictive material is the compatibility of the mixture when exposed to waste liquids, once the liner properties can be affected after waste disposition. This paper focus on the compatibility of mixtures of a tropical soil sample plus bentonite exposed to different chemicals solutions. This parameter is evaluated through modified Atterberg limits determination. The proportions used to compose the mixtures were 3, 6, 9 and 12％ (dry weight basis). The chemical solutions applied were sodium hydroxide (pHl 1), nitric acid (pH3) and sodium chloride (5 g/L). The results indicate a small decrease in the plasticity of the mixtures when exposed to acidic and alkaline solutions, while greater variations were observed when the mixtures were exposed to the salty solution. The incompatibility index (ICP) shows that the addition of bentonite did not exert so much influence on the compatibility of the samples, especially at high proportions and for salty solutions.
tropical soils bentonite clay chemicals solutions plastic indez compatibility
Thiago Luiz Coelho MORANDINI Adilson do Lago LEITE
Nucleo de Geotecnia, Universidade Federal de Ouro Preto, Brazil Universidade Federal de Ouro Preto, Brazil
国际会议
International Symposium on Geoenvironmental Engineering(国际环境岩土工程研讨会
杭州
英文
525-530
2009-09-08（万方平台首次上网日期，不代表论文的发表时间）