Erosion Control Articles

  • Landfarming

    Introduction Landfarming is a full-scale bioremediation technology, which usually incorporates liners and other methods to control leaching of contaminants, which requires excavation and placement of contaminated soils, sediments, or sludges. Contaminated media is applied into lined beds and periodically turned over or tilled to aerate the waste. Soil conditions are often controlled to ...

  • Properties and Behavior of Inorganics in Contaminated Soil

    Often, specific technologies may be ruled out, or the list of potential technologies may be immediately narrowed, on the basis of the presence or absence of one or more of the chemical groups. The relative amounts of each may tend to favor certain technologies. Metals may be found in the elemental form, but more often they are found as salts mixed in the soil. At the present time, treatment ...

  • Laboratory Testing Apparatus for Slopes Stabilized by Anchored Geosynthetics

    A laboratory testing apparatus is described for examining slopes subjected to seepage and stabilized by anchored geosynthetics (AGS). The AGS technique can increase the stability of cohesionless slopes such as coastal dunes against surficial erosion and shallow mass failure caused by wave action and seepage forces. In the AGS, a geosynthetic fabric is placed on the face of the slope and tensioned ...


    By ASTM International

  • Strain Measurement in HDPE Geomembrane Tensile Tests

    According to ASTM D 638, the tensile strain in an HDPE geomembrane dumbbell specimen subjected to a tensile test should be evaluated using an extensometer that records the elongation of a defined length of the central portion of the specimen. However, the current practice in the United States for HDPE geomembrane quality control and conformance testing consists of following the 1991 NSF standard ...


    By ASTM International

  • Notched Constant Tensile Load (NCTL) Test for High-Density Polyethylene Geomembranes

    A modification of an old test method, the notched constant tensile load (NCTL) test, is reintroduced to evaluate the stress-cracking performance of high-density polyethylene (HDPE) geomembranes. In this modified test, notched dumbbell-shaped specimens are subjected to a range of constant tensile loads in a 10% Igepal (CO-630) solution at 50°C. The method has been proposed to ASTM and is being ...


    By ASTM International

  • Effects of Strain Rate on Instability of Granular Soils

    An experimental study of the effect of strain rate on the stability of granular soils at high pressures has shown that there is no apparent effect on the location of the instability line. However, during undrained triaxial compression tests the deviator stress, effective stress path, effective stress friction angle, and pore pressures are significantly affected by changes in strain rate. Strain ...


    By ASTM International

  • E and EL Pulverizer Springs - Case study

    Purpose To advise owners and operators of E or EL pulverizers to inspect dual purpose springs. The dual purpose spring serves two functions: 1) preloads the grinding elements, and 2) prevents the upper grinding ring from rotating. Background Existing dual purpose springs are typically replaced with new springs when replacing a set of worn out grinding ...


    By Dürr Megtec LLC

  • Statistical Description of Triaxial Shear Test Results

    Any probabilistic approach to slope stability assessment requires an adequate statistical description of soil strength. Current statistical methods of strength description are unsuitable for this purpose. A statistical technique of soil strength description appropriate for the probabilistic assessment of slope stability in c', f' soils under drained conditions is developed here. The technique is ...


    By ASTM International

  • Assessment of the Unconfined Compressive Strength of a Lime Stabilized Soil by an Abrasion Test

    Stabilization by lime, which is frequently carried out to improve the mechanical properties of soils, results from the formation and development of cementitious calcium silicate aluminate hydrate gel. The gel produces interlocking and bonding of the soil particles, hence increasing the strength and abrasion resistance. The proposed method to assess the compressive strength of the existing ...


    By ASTM International

  • The Prediction of Fracture Fatigue Parameters from Creep Testing of Soil Cement

    When a cement-treated base layer is subjected to repeated stress, inherent microcracks begin to propagate and coalesce from the bottom of the layer and finally cause the layer to fail. In order to identify the rate of fatigue failure of the cement-stabilized base layer, Paris´ law, da/dN = A(?Kmax)n, can be used.In this research, the parameters, A and n, were predicted by a viscoelastic approach. ...


    By ASTM International

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