Temperature Effects on Geotechnical and Hydraulic Properties of Bentonite Hydrated with Inorganic Salt Solutions
نویسندگان
چکیده
This study investigated the combined effect of temperature and single-species salt solutions on geotechnical properties (swell index and liquid limit) and hydraulic conductivity of bentonite applying different cation types, concentrations, and temperatures. Results showed that both the swell index and the liquid limit decreased with an increase in salt concentration irrespective of the type of cation. Monovalent cations showed higher values of the swell index and the liquid limit compared to divalent cations. In general, the swell index of bentonite increased whereas the liquid limit decreased with increasing temperature for all cation types and concentrations. Significant and high correlations were found between swell index and liquid limit of bentonite at all three temperatures. Hydraulic conductivity of bentonite was found to increase with increasing temperature. No significant change in hydraulic conductivity with time was observed for all concentrations and cation types, and, overall, concentration and valance of cations had little effect on the hydraulic conductivity of bentonite.
منابع مشابه
Investigation on chemical effects on GMZ bentonite used as buffer materials
GMZ bentonite has been selected as a buffer/backfill material for the design of Chinese HLW repository due to its suitable properties. Investigations have been conducted on this material to have a better understanding of its engineering behavior. In this paper, a review of the studies on the chemical effects in GMZ bentonite is presented. The adsorption of radionuclides Ni(II), Cr(III) and Eu(I...
متن کاملImpact of Distillery Effluent and Salts on Hydraulic Conductivity of a Sandy Loam Soil
Irrigation with distillery effluent, besides influencing crop yield, may have considerable impact on physical properties of soil because of its high salt and organic carbon contents. This experimental study was conducted to evaluate the effect of distillery effluent on hydraulic conductivity of a sandy loam alluvial soil and compare the effect of inorganic salts of potassium (K) with that of di...
متن کاملPhysicochemical and Geotechnical Alterations to MX-80 Bentonite at the Waste Canister Interface in an Engineered Barrier System
The study investigated the basic geomechanical and mineralogical evolution of the bentonite barrier under various experimental boundary conditions which replicated the near-field Thermo-Hydro-Chemico (THC) conditions in a repository. The relationships between the physicochemical alterations and changes in the geotechnical properties have seldom been studied, especially on a consistent dataset. ...
متن کاملEvaluation of a Naturally-derived Deflocculant (Terminalia Chebula) in Bentonite Dispersions
The unwanted addition of salt to drilling causes flocculation which has an adverse effect on mud rheological properties. To treat the flocculated mud chemical, deflocculants are commonly used; however, their disadvantages such as negative environmental effects, lower tolerance to contamination, and toxicity motivated scientists to search for effective additives. Using plant derived additives in...
متن کاملDamage in porous media due to salt crystallization.
We investigate the origins of salt damage in sandstones for the two most common salts: sodium chloride and sulfate. The results show that the observed difference in damage between the two salts is directly related to the kinetics of crystallization and the interfacial properties of the salt solutions and crystals with respect to the stone. We show that, for sodium sulfate, the existence of hydr...
متن کامل