pre-compression shear Articles

  • Consolidation, Pre- and Post-Peak Shearing Responses from Internally Instrumented Biaxial Compression Device

    An internally instrumented, servo-controlled biaxial compression device is described for evaluating shear band formation in soils. Internally measured vertical and lateral soil displacements as well as lateral deformations of a very low friction bottom sled allow one to observe the progressive development of shear bands in a specimen. Anisotropically consolidated specimens of relatively ...


    By ASTM International

  • A Fast Triaxial Shear Device

    The fast triaxial shear device (FTRXD) loads a 1.9-cm (0.75-in.) diameter by 3.8-cm (1.5-in.) long soil specimen, deforming it axially at a very rapid rate. The specimen is deformed by a piston-cylinder assembly driven by compressed nitrogen. Load and displacement at the top of the specimen and load at the bottom are measured; the specimen is subjected to a confining pressure up to 6.9 MPa (1000 ...


    By ASTM International

  • Use of Stereophotogrammetry to Analyze the Development of Shear Bands in Sand

    Experimental results are presented from plane-strain compression of a fine-grained, water-saturated loose sand. Together with local measurements of boundary stresses and deformations, systematic analysis of photographs of the deforming specimen allowed for measuring deformations and computing strain fields inside and outside the shear band. The principles, details, and accuracy of the procedure ...


    By ASTM International

  • Measurements of Normal Deformations in Joints During Shear Using Inductance Devices

    The use of inductance coils for measuring normal deformations involving dilation or compression across a discontinuity is described. Discontinuities may be in the form of interfaces between dissimilar materials or rock joints. In contrast to the conventional schemes for measuring normal deformation that involve installation of measuring devices (linear variable differential transformers, LVDTs) ...


    By ASTM International

  • An Automated Electropneumatic Control System for Direct Simple Shear Testing

    This paper describes the design and implementation of an automated electropneumatic control system for direct simple shear testing of cohesive soils. The hardware and software used to perform automated application of consolidation increments and for subsequent constant volume shear of soil specimens is described in detail. Two servo-control algorithms are used to conduct a test, one for ...


    By ASTM International

  • Investigation on punching shear behaviour of multi–panel flat slab

    Reinforced concrete multi–panel flat slabs subjected to punching shear are investigated in this study on the basis of finite element analysis. The study involves development of a non–linear material model strategy based on past experimental investigations which implements solution for a realistic description of punching shear of RC slabs for several types of concrete strength and reinforcement ...


    By Inderscience Publishers

  • Optimisation of micro-processes for shear-assisted solid–liquid separation in a rotatory batch flow vortex reactor

    This paper reports the study of micro-processes in a novel pre-treatment technique using a pellet forming batch flow vortex reactor of cylindrical shape that consists of axially revolving rotor plates between fixed stator plates. The suspension was first mixed with high molecular weight synthetic polymers by stirring for approximately 50 seconds and then agitated for 20 minutes. The process ...


    By IWA Publishing

  • Recycling of Pre-consumer Plastic Film

    Untitled Document ...


    By Shred-Tech Corp.

  • VSEP filters mine tailing pond effluent with no pre-treatment required

    New Logic International installed its Vibratory Shear Enhanced Processing (VSEP) system in March, 1998 at a major California rare earth mining and manufacturing facility. The VSEP is used for treatment of mine tailing pond effluent at this facility with no pretreatment required. The VSEP system uses nanofiltration followed by ultrafiltration membrane modules and is able to treat the mine tailing ...


    By New Logic Research, Inc.

  • Effects of Anisotropic Versus Isotropic Consolidation in Consolidated-Undrained Triaxial Compression Tests of Cohesive Soils

    This investigation examines effects of anisotropic versus isotropic consolidation in consolidated-undrained triaxial compression tests performed on specimens of two clays consolidated from a slurry in large-diameter consolidometers. Shear strength and corresponding deformation characteristics were developed in both normally consolidated and overconsolidated ranges. Test results indicate that ...


    By ASTM International

  • Pre-Treatment of Sludges Before Aerobic Digestion to Enhance Sludge Quality

    ABSTRACTBench scale experimentation was completed to assess the potential of using a short residence time pre-treatment reactor upstream of aerobic digestion to enhance the destruction of pathogens. The impact of aeration, temperature, hydraulic residence time, solids concentration, feeding frequency and mechanical shearing on the pre-treatment process was investigated. Subsequent testing ...

  • Micrometeorological simulations over a complex terrain with SUBMESO: a model study using a novel pre-processor

    Effects of topography on micrometeorological fields may have a great impact on noise propagation. Consequently, we discuss some preliminary results from a modelling study of short-term evolution of wind and temperature over a smooth, non-flat terrain. The study is performed using the 3-D model SUBMESO. A new meteorological pre-processor (MPP) has been implemented to specify vertical profiles of ...


    By Inderscience Publishers

  • VSEP treats thermomechanical pumping effluent with no pre-treatment required at a major MDF plant

    New Logic International installed its Vibratory Shear Enhanced Processing (VSEP) system in August, 1998 at a major international Medium Density Fiber (MDF) Board manufacturing facility. The VSEP is used for treatment of thermomechanical pulping effluent at this facility with no pretreatment required. The VSEP system uses a nanofiltration membrane module and is able to treat pressate from the ...


    By New Logic Research, Inc.

  • Geotechnical Properties of Expanded Shale Lightweight Aggregate

    In recent years lightweight aggregates are being used increasingly in geotechnical applications. This paper presents results of large-size one-dimensional compression and direct shear tests performed on lightweight aggregate. The compressibility and shear strength characteristics of the lightweight aggregate are compared with those of normal-weight aggregate using the same experimental setup. ...


    By ASTM International

  • A Biaxial Apparatus for Testing Soils

    A biaxial compression apparatus for investigating shear-band formation and growth in dry and water-saturated sand and clay specimens is described. This apparatus is a modification of the device designed by Vardoulakis and Goldscheider [1] for testing planar shear banding in sands. The modifications involve improved axial load guidance, low friction linear bearing, and enhanced load and ...


    By ASTM International

  • Monotonic and Cyclic Loading Behavior of Two Sands at Small Strains

    The shear modulus of freshly deposited specimens of two different sands was measured in a resonant column (RC)-torsional shear (TOS) apparatus. The soil specimens studied included a calcareous, crushable, well-graded, coarse-to-medium sand containing about 2% fines (Quiou sand) and a silica, uniform, coarse-to-medium sand without fines (Ticino sand).A brief description of the apparatus, with ...


    By ASTM International

  • Pile Skin Friction in Sands from Constant Normal Stiffness Tests

    Many interface and sand-to-sand direct shear tests have been performed with a constant normal stiffness to investigate the effects of interface roughness, normal stiffness, soil relative density, initial normal stress, and cyclic displacement amplitude on the soilinterface response. It is demonstrated that the patterns of behavior in these tests are similar to those observed in model pile tests ...


    By ASTM International

  • Time-Dependent Triaxial Relaxation Behavior of a Resedimented Clay

    The paper describes the results of K0 consolidated-undrained triaxial compression relaxation tests on resedimented Boston Blue Clay (BBC) using a computer-automated triaxial apparatus. Specimens were either normally consolidated (overconsolidation ratio, OCR = 1) or had an OCR = 4, and they were sheared at different axial strain rates to axial strains (ea) from 0.1 to 15%. Each strain level was ...


    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

  • The results exceeded our expectations

    After using a Lindemann scrap shear type LU 1250/15 PA 90/25 intensively for 21 years at its headquarters in ’s-Gravendeel, the Dutch firm HKS Scrap Metals found that the machine’s hydraulic system was not functioning up to par, as is inevitable with any system subject to wear and tear. As a result, production had dropped significantly – from 35 t/h to 22 t/h. The year was 2010, ...


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