ASTM International

23 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

  • Moisture Increase in Expansive Soils at Developed Sites

    Moisture Increase in Expansive Soils at Developed Sites

    The purpose of this paper is to provide information pertinent to post-development depth-of-moisture increase in expansive soils underlying developed sites. In southern California, the developments are generally accompanied by irrigation around ...

    Sikh TS

  • 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

  • Temperature Dependence of Soil Water Potential

    Temperature Dependence of Soil Water Potential

    To understand the process of coupled heat and water transport, the relationship between temperature and soil water potential must be known. Two clays, Avonlea bentonite and Lake Agassiz clay, are being considered as the clay-based sealing materials ...

    Mohamed A-MO; Yong RN; Cheung SCH

  • Tensiometers—Theory, Construction, and Use

    Tensiometers—Theory, Construction, and Use

    Standard tensiometers are used to measure matric potential as low as -870 cm of water in the unsaturated zone by creating a saturated hydraulic link between the soil water and a pressure sensor. The direction and, in some cases, quantity of water ...

    Stannard DI

  • A New Filter Material for Measuring Soil Suction

    A New Filter Material for Measuring Soil Suction

    The filter paper method for determining soil suction has been in use for many years and owes its attraction to its simplicity. A major drawback of the method is that the suction range over which it can be applied is limited by the moisture ...

    Sibley JW; Williams DJ

  • 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

  • The Use of Proximity Transducers for Local Strain Measurements in Triaxial Tests

    The Use of Proximity Transducers for Local Strain Measurements in Triaxial Tests

    A description is given of an instrumentation system suitable for measuring axial and radial strains locally in the central region of a triaxial specimen. The system is primarily intended to measure small strains and is one of several that may be ...

    Hird CC; Yung PCY

  • 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