28 Articles found
ASTM International Articles
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A Commitment to Standards
An Interview with Philip Piqueira, Global Standards Leader for GE’s Industrial Solutions Business General Electric participates in standards development through its work on numerous committees and organizations. Philip Piqueira discusses why ...
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Lot Acceptance Procedure Criteria
Providing Statistical Confidence to Pass Q. Lots are released based on comparing test results from a sample to lot acceptance procedure criteria. If a set of test results meets the lot acceptance procedure criterion, how can I be assured that ...
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Standards in Capstone Projects
My standards education began in 1990 when I became the chairman of an ASTM International task group. I was the group leader of R&D for a medical device manufacturer, recognized the need for a specific industry standard and felt that taking a ...
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Measurement of Shear Waves in Laboratory Specimens by Means of Piezoelectric Transducers
The use of piezoelectric ceramics to measure shear wave velocity in laboratory soil specimens is discussed. The experimental technique and interpretative methodology are described. Both bender and flat-plate ceramic elements were employed, and each ...
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Automated Determination of the Distribution of Local Void Ratio from Digital Images
The frequency distribution of local void ratio is believed to be an important parameter, in addition to the void ratio, for describing the mechanical behavior of granular materials. Oda proposed a method to determine experimentally the distribution ...
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Coupled Heat and Moisture Flow in Unsaturated Swelling Clay Barriers
The main thermodynamic forces active in the near field of a nuclear fuel waste multiple barrier system during the unsaturated stage are the gradients of temperature, fluid pressure, and chemical potentials. The processes that have a direct impact on ...
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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 ...
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Screw Plate Insertion in Sand
Laboratory measurements of the depth of penetration at the end of each revolution of a 30-mm-diameter screw plate were made when the insertion was carried out with no vertical thrust applied to the screw plate. The tests were carried out to a depth ...
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Determination of Swell Potential of Al-Qatif Clay
Knowledge of the swell potential of expansive soil at the outset of an investigation can be helpful in avoiding possible damage to the structure. A review is presented of several methods that have been proposed to identify swell potential and test ...
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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 ...
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Prediction of Expansion Degree for Natural Compacted Clays
This paper presents a laboratory study aimed at developing a reliable method to predict the expansion degree of clays. The work herein is intended to complement, not replace, existing research in this area. Utilizing test data for 128 natural soils, ...
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Swell Potential Versus Overburden Pressure
Data were collected and reviewed pertaining to one-dimensional vertical free-swell tests performed on existing fill soils from various projects located in Southern California. The purpose of reviewing the data was to evaluate the effect of ...
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Swelling Pressure Behavior Under Controlled Suction
An experimental study has been conducted to study the swelling pressure behavior of expansive soil in both vertical and lateral directions simultaneously under controlled suction. A series of one-dimensional consolidation tests was carried out on ...
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Hollow Cylinder Specimen Preparation: Cohesive Materials
Techniques for rapid and precise fabrication of hollow cylinder specimens of cohesive materials are presented. A device to accelerate the displacement sensor mounting process is described.
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Strength Changes in Sand Following Cyclic Shear
Static torsional simple shear tests were performed on poorly graded sand, with and without prior cyclic loading, to evaluate changes in static shear strength. Specimens were prepared at three densities (loose, medium, and dense) and were subjected ...
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The Toluene and Wax-Freezing Method of Determining Volumetric Free Swell
Swelling clay and rock are a common problem worldwide, and for design purposes it is necessary to quantify the free-swell behaviour of such material. A technique to measure the volumetric free swell of a swelling clay (called the toluene and ...
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Swelling/Shrinkage Characteristic Curve of Desiccated Expansive Clays
The change in void ratio with change in water content of expansive clayey soils due to soil desiccation and water absorption has been identified as the integral/combined curve referred to as S-curve, which describes both swelling and shrinkage paths ...
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Influence of Storage and Reconsolidation Procedures on Clay Properties
The delay between sampling and testing of clay specimens and the control kept over their volumes during storage are known to affect the strengths and compressibilities subsequently measured in the laboratory. The measured properties are also ...
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Shear Zone Characterization in Sands by Carbowax Impregnation
A procedure is presented for determining the void ratio distribution of very small zones in soil by carbowax impregnation. If the wax is injected slowly, complete filling of voids occurs and volume measurements become unnecessary. Thus, even ...
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Modified Bromhead Ring Shear Apparatus
A modified Bromhead ring shear apparatus is described, which incorporates vanes on the loading surfaces to improve torque transfer to the specimen. The specimen thickness is increased to accommodate the vanes. A method of specimen preparation is ...