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首页> 外文期刊>Canadian Geotechnical Journal >Compressibility effect in evaluating the pore-size distribution of kaolin clay using mercury intrusion porosimetry
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Compressibility effect in evaluating the pore-size distribution of kaolin clay using mercury intrusion porosimetry

机译：压汞法评估高岭土孔隙尺寸分布的压缩效应

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摘要

The objective of the present research is to quantitatively evaluate the compression that can occur during the evaluation of pore-size distribution of cohesive soil using mercury intrusion porosimetry (MIP). A new experimental procedure was developed that can be routinely used to evaluate the corrections associated with the compressibility for porous solid samples using MIP. The approach used in this study involves performing mercury intrusion tests on dehydrated kaolin samples using freeze-dried and oven-dried techniques, and on identical samples confined by low-porosity latex membranes. Corrections for latex intrusion and issues related to dehydration of samples are addressed. The measured contact angle of mercury with kaolin clay using the sessile drop technique was used in the data reduction. Repeatable test results were obtained throughout the testing program. The procedure for obtaining volume-change behavior under isotropic conditions for a large range of pressures using the mercury porosimeter is also presented for oven-dried samples. Scanning electron micrographs for intruded and compressed specimens are presented along with a discussion on the observed hysteresis in MIP test data. The test results for kaolin samples show substantive initial compression before the occurrence of actual intrusion. This resulted in errors associated with the interpretation of pore sizes with diameters in the range of 0.4-200 mu m. [References: 17]
机译：本研究的目的是定量评估使用压汞法（MIP）评估粘性土的孔径分布过程中可能发生的压缩。开发了一种新的实验程序，该程序可常规用于评估使用MIP对多孔固体样品的可压缩性进行的校正。本研究中使用的方法涉及使用冻干和烘箱干燥技术对脱水的高岭土样品以及由低孔隙率乳胶膜限制的相同样品进行汞侵入测试。解决了乳胶浸入的更正以及与样品脱水有关的问题。使用固定滴技术测量的汞与高岭土的接触角用于减少数据。在整个测试程序中都获得了可重复的测试结果。还介绍了使用汞孔隙率计在各向同性条件下获得大范围压力下体积变化行为的程序，该程序适用于烘干的样品。提出了侵入和压缩样品的扫描电子显微照片，并讨论了在MIP测试数据中观察到的磁滞现象。高岭土样品的测试结果表明，在发生实际侵入之前，存在实质性的初始压缩。这导致与解释直径在0.4-200μm范围内的孔径有关的错误。 [参考：17]

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