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D. N. Arnepalli S. Shanthakumar B. Hanumantha Rao D. N. Singh 《Geotechnical and Geological Engineering》2008,26(2):121-132
Characteristics of fine-grained soils primarily depend on their specific-surface area and hence, reliable determination of
this parameter is essential. In this context, researchers have employed quite sophisticated instruments (viz., a BET surface
area analyzer, the mercury intrusion porosimetry, internal reflectance spectroscopy, X-Ray diffraction and gas pycnometer
etc.) and methodologies (viz., sorption of Methylene Blue dye, Ethylene Glycol Monoethyl Ether and p-Nitrophenol) to determine specific-surface area of these soils. However, most of these methodologies are found to be quite
tedious, cost and time intensive. Apart from this, the results obtained are contentious due to the inherent limitations associated
with either the instruments employed or the basic assumptions made for computing the specific-surface area of the soil. Hence,
it becomes mandatory to evaluate the efficiency of these methodologies for determining specific-surface area of fine-grained
soils. With this in view, different types of soils were considered in this study and their specific-surface area was determined,
by following different methodologies, and the results were evaluated critically. In addition, attempts were made to develop
relationships between the basic properties of fine-grained soils (viz., liquid limit, cation-exchange capacity, activity,
and free swell index) and the specific-surface area. These relationships will be of immense help to the practicing engineers
and research fraternity. 相似文献
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Kai Witthüser Dalinaidu Arnepalli Devendra N. Singh 《Geotechnical and Geological Engineering》2006,24(2):325-334
Contaminant transport through fractured rock mass is predominated by diffusion. This is due to the continuous interaction
of the mobile water present in the fracture network and relatively immobile pore water, which is adsorbed on the surface and
in the rock matrix itself. Even though the advective flow through the fracture network is high, besides sorption of rock mass,
the diffusive exchange into the rock mass leads to significant retardation of contaminant transport. Hence, for describing
contaminant transport in fractured rock mass, more precisely, the effect of retardation attributed to the matrix diffusion
must be taken in account. With this in view, a methodology, which can be employed for determination of the diffusion characteristics
of the rock mass, has been developed and its details are presented in this paper. Validation of the methodology has been demonstrated
with the help of Archie’s law. 相似文献
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