ASTM International

18 Articles found

Articles

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  • Green Roofs are Growing

    Green Roofs are Growing

    Standards from ASTM International Committee E60 on Sustainability guide work on vegetative green roofs. Walking south along Michigan Ave. from the Chicago River, a first-time visitor might take in the green vistas of Millenium Park sprawling ...

    Cicely Enright

  • Consolidation Behavior of Clayey Soils Under Radial Drainage

    Consolidation Behavior of Clayey Soils Under Radial Drainage

    For Barron´s degree of consolidation, Ur, versus the time factor, Tr, relationship for soils undergoing consolidation with radial drainage for the equal vertical strain condition, a simple method has been developed to determine the value of the ...

    Sridharan A; Prakash K; Asha SR

  • The Relationship Between the Soil-Water Characteristic Curve and the Unsaturated Shear Strength of a Compacted Glacial Till

    The Relationship Between the Soil-Water Characteristic Curve and the Unsaturated Shear Strength of a Compacted Glacial Till

    Soils compacted at various “initial” water contents and to various densities should be considered as “different” soils from a soil mechanics behavioral standpoint even though their mineralogy, plasticity, and texture are the same. The engineering ...

    Vanapalli SK; Fredlund DG; Pufahl DE

  • Wave Propagation in Soils: Multi-Mode, Wide-Band Testing in a Waveguide Device

    Wave Propagation in Soils: Multi-Mode, Wide-Band Testing in a Waveguide Device

    This paper presents the development of a waveguide device and the corresponding processing methodology to study wave propagation in particulate materials. Its main advantages are: the cancellation of biasing transfer functions (e.g., transducer, ...

    Fratta D; Santamarina JC

  • Alternative Test Method for Resilient Modulus of Fine-Grained Subgrades

    Alternative Test Method for Resilient Modulus of Fine-Grained Subgrades

    The mechanistic design of flexible pavement systems requires the specification of mechanical properties for asphaltic concrete, base course, and soil subgrade. The stiffness of the soil subgrade is represented by the resilient modulus, Mr, which is ...

    Drumm EC; Li Z; Reeves JS; Madgett MR

  • Model Study on the Failure Mechanism of Soil-Nailed Structure Under Surcharge Loading

    Model Study on the Failure Mechanism of Soil-Nailed Structure Under Surcharge Loading

    To investigate the effects of surcharge loading on the failure mechanism of soil-nailed structures, reduced scale-model tests were performed. The main variables for this study were the bending stiffness and tension resistance of nails and applied ...

    Kim D-S; Juran I; Nasimov R; Drabkin S

  • Effect of Simulated Roots on the Permeability of Silty Soil

    Effect of Simulated Roots on the Permeability of Silty Soil

    A preliminary laboratory testing program was conducted to investigate the potential effect of vegetation on the hydraulic conductivity of soils used to construct levee structures. The testing program was conducted using a silty sand soil with a ...

    Gabr MA; Akram M; Taylor HM

  • Effect of Short Duration of Load increment on the Compressibility of Soils

    Effect of Short Duration of Load increment on the Compressibility of Soils

    This study concerns the effect of duration of load increment (up to 24 h) on the consolidation properties of expansive black cotton soil (liquid limit = 81%) and nonexpansive kaolinite (liquid limit = 49%). It indicates that the amount and rate of ...

    Sridharan A; Sivapullaiah PV ; Stalin VK

  • A New Combined Servo-Controlled Loading Frame/Direct-Shear Apparatus for the Study of Concrete or Rock Joint Behavior Under Different Boundary and Loading Conditions

    A New Combined Servo-Controlled Loading Frame/Direct-Shear Apparatus for the Study of Concrete or Rock Joint Behavior Under Different Boundary and Loading Conditions

    A new combined servo-controlled loading frame/direct-shear apparatus has recently been developed at the Civil Engineering Department of Université de Sherbrooke. This direct-shear device is capable of shear testing of rock joints under constant ...

    Mouchaorab KS; Benmokrane B

  • Behavior of Fiber-Reinforced Cemented Sand Under Static and Cyclic Loads

    Behavior of Fiber-Reinforced Cemented Sand Under Static and Cyclic Loads

    Triaxial static compression, cyclic compression, and splitting tension tests were performed to evaluate the effect of randomly distributed fiber reinforcement on the response of cemented sand to load. Test results indicated that fiber reinforcement ...

    Maher MH; Ho YC

  • Swelling Pressure Behavior Under Controlled Suction

    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 ...

    Habib SA; Karube D

  • A New Traveling Sand Pluviator to Reconstitute Specimens of Well-Graded Silty Sands

    A New Traveling Sand Pluviator to Reconstitute Specimens of Well-Graded Silty Sands

    A new traveling sand pluviator to reconstitute small specimens for laboratory tests was developed in joint research between the Research Center of the Italian National Electricity Board (ENEL CRIS) of Milano and the Department of Structural ...

    Lo Presti DCF; Berardi R; Pedroni S; Crippa V

  • Determination of Clay Size Fraction of Marine Clays

    Determination of Clay Size Fraction of Marine Clays

    This technical note describes a study on the effect of different dispersing agents and the quantity of same on the grain-size distribution and in particular the percentage of clay size. The results confirm that the existing practice of using 100 mL ...

    Sridharan A; Jose BT; Abraham BM

  • Automatic Back-Pressure Saturation Device for Triaxial Testing

    Automatic Back-Pressure Saturation Device for Triaxial Testing

    If back pressures are applied to unsaturated triaxial specimens too rapidly, the specimens may be overconsolidated by the temporary application of effective stresses that are higher than intended. This is dangerous because the strengths of the ...

    Brandon TL; Duncan JD; Cadden AW

  • Pore-Water Pressure Buildup in Clean Sands Because of Cyclic Straining

    Pore-Water Pressure Buildup in Clean Sands Because of Cyclic Straining

    The prediction of pore-water pressure buildup in sands caused by undrained cyclic loading is one of the key items in evaluating the potential for liquefaction of sandy sites during earthquakes. Presented herein are data indicating that, in ...

    Ladd RS; Dobry R; Dutko P; Yokel FY; Chung RM

  • Compaction Control and the Index Unit Weight

    Compaction Control and the Index Unit Weight

    Procedures for measurement of percent compaction and several related practical issues are discussed. When measuring percent compaction, the “maximum” unit weight should be determined for each field unit weight test or nuclear unit weight measurement ...

    Poulos SJ

  • Compressibility Properties of a Horticultural Peat

    Compressibility Properties of a Horticultural Peat

    The compressibility of a typical horticultural peat has been studied in the laboratory. Compressibility is an important factor in the processing of this material since volume governs the cost of shipping. The final reconstituted volume and the ...

    Morin P

  • Accuracy of the Density Scoop for Unit Weight Determinations in Cohesionless Soils

    Accuracy of the Density Scoop for Unit Weight Determinations in Cohesionless Soils

    An assessment is made of the accuracy of the Selig density scoop for determining the unit weight of dry cohesionless soils. Seven different soils were used in the study. The results show grain size and density dependence. Recommendations are made ...

    Weiler WA; Kulhawy FH