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首页> 外文会议>GeoShanghai International Conference; 20060606-08; Shanghai(CN) >Contrasting Influence of Caustic Alkali on the Behavior of Two Swelling Soils
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Contrasting Influence of Caustic Alkali on the Behavior of Two Swelling Soils

机译：苛性碱对两种膨胀土行为的对比影响

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Investigations were carried out to bring out the effect of varying concentration of caustic alkali, NaOH, solutions on the volume change behaviour of two swelling soils containing different types of clay minerals. The effect of contamination is studied not only during contamination but also on already contaminated samples. Bentonite and natural Indian black cotton soil containing interstratified illite-smectite mineral were contaminated with caustic soda solutions of 1 N and 4 N concentration. The oedometer tests revealed abnormal volume change behaviour in Black cotton soil during unloading. This has been attributed to mineralogical alterations as suggested by XRD and DTA studies. Dissolution of interlayer potassium from interstratified illite-smectite due to interaction with alkali solution has led to the separation of unit layers of the interstratified mineral causing swelling. In bentonite characteristic swelling is restricted and compressibility has decreased due to changes in the thickness of diffuse double layer rather than mineralogical changes.
机译：进行了研究，以得出不同浓度的苛性碱，NaOH和溶液对两种包含不同类型粘土矿物的膨胀土壤的体积变化行为的影响。不仅在污染期间研究污染的影响，而且还对已经污染的样品进行研究。膨润土和含有层状伊利石-蒙脱石矿物的印度天然黑棉土被浓度为1 N和4 N的苛性钠溶液污染。里程表测试显示，卸载期间黑色棉土壤中的体积变化行为异常。这是由于XRD和DTA研究提示的矿物学改变。由于与碱溶液的相互作用，层状钾从层状伊利石-蒙脱石中的溶解导致层状矿物的单位层分离，从而引起溶胀。在膨润土中，由于扩散双层厚度的变化而不是矿物学的变化，膨胀特性受到限制，可压缩性降低。

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