bentonite mixture Articles

  • Determining Bentonite Content in Soil-Bentonite Mixtures Using Electrical Conductivity

    A procedure based on electrical conductivity is described for measuring bentonite content in soil-bentonite mixtures having a wide range of bentonite contents. Standard equipment used for sedimentation analysis and an electrical conductivity meter are required. The procedure employs calibration curves relating electrical conductivity and bentonite concentration for soil-bentonite-water slurries. ...


    By ASTM International

  • Influence of Soil Structure on the Stress-Strain Behavior of Sand-Bentonite Mixtures

    The influence of soil structure on the behavior of clay-rich mixtures has been examined. Mixtures of sand and bentonite, known as buffer, have been studied to determine their suitability for nuclear fuel waste containment. Triaxial tests have been performed on compacted specimens to determine the strength and constitutive behavior of the buffer. Two techniques were followed in preparing ...


    By ASTM International

  • Case study - pumping bentonite

    Location: Germany Year: 2009 Working Context description The project is the construction of a big commercial and residential area in northern Germany during foundations phase. Diaphragm walls and Cut Off Walls are a techniques for the construction of permanent or temporary in-situ impermeable barriers. In order to stabilize side walls bentonite ...


    By Dragflow S.r.l.

  • Case study - pumping bentonite

    Location: Germany Year: 2009 Working Context description The project is the construction of a big commercial and residential area in northern Germany during foundations phase. Diaphragm walls and Cut Off Walls are a techniques for the construction of permanent or temporary in-situ impermeable barriers. In order to stabilize side walls ...


    By Dragflow North America

  • Adsorption studies of Orange II onto polyaniline/bentonite nanocomposite

    Modification of bentonite is essential for the adsorption of anionic dyes, as its negative surface charge. In this study, polyaniline/bentonite (PAni-Bent) nanocomposite was synthesized by in-situ intercalative polymerization technique and used to remove anionic dye Orange II (ORII) from synthetic wastewater. Its structure was confirmed by X-ray diffraction (XRD), scanning electron ...


    By IWA Publishing

  • 1 g Small-Scale Modelling of Saturated Cohesive Soils

    This paper describes the use of 1 g small-scale models composed of weak, saturated clay mixtures to investigate the response of natural clay deposits to underlying base rock fault displacements. A 3:1 mixture of kaolinite and bentonite at water contents between 150 and 100% produces a material with undrained shear strengths on the order of 1 to 2.5 kPa and well-scaled stress deformation behavior ...


    By ASTM International

  • Moisture Content and Density of Smectites

    The measured density of smectites, using ASTM Test Method for Specific Gravity of Soils (D 854) and ASTM Method for Laboratory Determination of Water (Moisture) Content of Soil, Rock, and Soil-Aggregate Mixtures (D 2216), vary as a function of heating temperature and time. For example, the measured moisture content of air-dry Otay bentonite, heated to 110°C, varied from 16.48% moisture to 19.0% ...


    By ASTM International

  • Preparation of solid composite polyferric sulfate and its flocculation behavior for wastewater containing high concentration organic compounds

    A new kind of inorganic polymer flocculant, the solid composite polyferric sulfate (SPFS) was prepared using ferrous sulfate and Na-Bentonite. The obtained SPFS was characterized by FT-IR spectra, thermogravimetric analysis (TG), scanning electron microscope (SEM) and X-ray Diffraction (XRD). It showed that SPFS was a kind of composite inorganic polymer, which was the complex of PFS and Na-Bent, ...


    By IWA Publishing

  • Clay Lumps under Simulated Hydraulic Transport Conditions

    Laboratory experiments with compacted kaolinite-bentonite mixtures indicate that degradation of hydraulically transported clay lumps in a dredge pipeline can be predicted and controlled to some extent. The size reduction of these lumps depends not only on the length of the pipeline but also on the density of the clay being dredged, the plasticity index (PI) of the clay, and the velocity of the ...


    By ASTM International

  • Abandoning Monitoring Wells: Safety Issues

    Monitoring wells are typically constructed to gauge the extent of contamination, assess water quality and conduct other hydrogeologic studies. Depending on its objective, the monitoring well may remain in use or may be abandoned permanently. When declared inactive, the well is many a times left as it is. Open unused wells are hazardous to life and environment: • Contamination may spread from one ...

  • EPA studies identify techniques for critical leak testing prior to soil-vapor sampling

    Researchers at EPA’s National Risk Management Research Laboratory (NRMRL) in Ada, OK, are developing quality assurance (QA) measures for soil-gas and sub-slab sampling methods that help differentiate contaminant vapors due to vapor intrusion from background sources. Recent research focused on measures to identify leakage of ambient air into conventional vapor probes, which can significantly ...

  • Case study - One-pass-trencher used to repair Tyler Dam

    Greg DeWind takes pride in his one-pass trenching machine. With a smile on his face, he watches Wednesday as it is used to dig a trench at the Lake Tyler Dam. The 225,000-pound, 3,000-horsepower machine mixes soil, cement and bentonite clay as it cuts a trench that is 2 1/2-foot wide and about 70 feet deep, according to Steve Richards, with ETTL Engineers and Consultants. It burns about 100 ...

  • Assessing the transport and fate of MTBE

    Untitled Document ...


    By Solinst Canada Ltd.

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