laboratory testing Articles

  • Soft Oedometer—A New Testing Device and Its Application for the Calibration of Hypoplastic Constitutive Laws

    The problem addressed is how to obtain the material parameters of soils and other granular materials by means of a simple and fast laboratory test which fulfills the requirement of homogeneous specimen deformation. A new laboratory testing device called “soft oedometer,” characterized by an extensible lateral supporting ring, makes it possible to measure not only the vertical but also the lateral ...


    By ASTM International

  • Hot water boiler system benefits for Sialex®Ring - Case Study

    There has been and still remains a degree of skepticism associated with a device to seemingly deliver results but with: No-visible power source  No-consumables to be added No by-products generated This sums up Sialex®Ring! Yet this is exactly the fact. Laboratory tests have their benefits, but when a laboratory test tries to re-create the ...


    By Phoenix Ring Manufaktur UG

  • Effect of Clod Size on Hydraulic Conductivity of Compacted Clay

    A study has been conducted to identify the causes for field-measured values of hydraulic conductivity of clay liners being typically two orders of magnitude greater than laboratory-measured values. It has been found through laboratory testing on large specimens that the size and gradation of clods and clumps of clay, prior to compaction, can significantly affect the measured hydraulic ...


    By ASTM International

  • Bearing Capacity of Strip Foundation on Geogrid-Reinforced Clay

    Laboratory model test results are presented for the ultimate bearing capacity of a strip foundation supported by a saturated clay layer reinforced by layers of geogrid. The tests were conducted in one type of clay. The average moisture content of the clay was varied, yielding varying undrained shear strengths. Laboratory tests were conducted to determine the critical nondimensional values for the ...


    By ASTM International

  • Laboratory Testing of Chemically Grouted Sand

    The effect of 14 parameters, associated with specimen preparation, handling, and testing, and with soil characteristics, was evaluated experimentally for laboratory prepared specimens of chemically grounted sands. Over 200 unconfined compression tests were conducted, and results are presented and comparisons are made in terms of unconfined compressive strength and tangent modulus at 50% of ...


    By ASTM International

  • On the Importance of Rate of Strain in the Consolidation Test

    In many consolidation tests the imposed rate of strain is several orders of magnitude faster than field rates even though it is well known that some of the parameters derived from laboratory tests are strain rate dependent. For this reason it is essential that the standard test procedure provides adequate guidance on the acceptable rate of strain for various classes of natural soils. This paper ...


    By ASTM International

  • Parameter Sensitivity of Hydraulic Conductivity Testing Procedure

    A methodology is presented that allows researchers to identify which parameters have the largest effect on key parameter(s), and thereby a priori direct investigations to concentrate on the most important area(s) of concern. Laboratory testing is often used in research to establish the effect of one or more parameters on one or more other parameters of concern. Because laboratory testing often is ...


    By ASTM International

  • Developing a Culture of Quality Through EQA

    From specimen collection to delivery of test results, laboratory testing must conform to the highest standards of quality: lives depend on it. Click the image below to read more from APHL. ...


    By Qualtrax Inc

  • ISOTEC Technology Effectively Treats 1,4-dioxane

    ISOTEC, with over 13 years of ISCO experience, has successfully demonstrated treatment of 1,4-dioxane in laboratory experiments. An initial laboratory test produced a 99%+ reduction in a field sample spiked 1,4-dioxane (see table 1). The result suggested that ISOTEC’s patented modified Fenton’s technology can achieve similar reductions under field conditions. An international ...

  • Prediction Models of Resilient Modulus for Nongranular Materials

    This paper describes an experimental program and the analyses performed for the purpose of developing prediction models of resilient modulus for nongranular materials. Two models were developed and are presented herein. The first model provides a quick estimation of the resilient modulus based on basic characteristics of the specimens, while the second model includes a family of curves that ...


    By ASTM International

  • Determination of Design Parameters of a Mesh-Type Soil Reinforcement

    Problems in determining design parameters of a new mesh-type soil reinforcement are investigated. A special apparatus referred to as the split-box was developed to enable measurement of design parameters with large-scale laboratory tests. In addition to the scale of the tests, the design innovations of the split-box ensure reliability of test results, as verified by a number of calibration tests. ...


    By ASTM International

  • Split-Hopkinson Pressure Bar Testing of Unsaturated Sand

    High amplitude, split-Hopkinson pressure bar (SHPB) laboratory tests were conducted on compacted specimens of 50/80 silica sand to evaluate the influence of saturation on compressional-stress wave velocity, stress transmission, and attenuation. Stress wave velocity and transmitted stress increase as the saturation increases from 0 to 30 to 40% for constant input stress and constant dry density. ...


    By ASTM International

  • Temperature Effect on Preconsolidation Pressure

    A change in temperature is known to affect the deformation properties of a clay specimen. In order to study the effect quantitative y and its dependence on clay type a number of oedometer tests were carried out. Conventional incremental oedometer tests as well as constant-rate-of-strain tests were used. Test results clearly show that the preconsolidation pressure decreases with increasing ...


    By ASTM International

  • Mexican Food Manufacturer

    A large manufacturer of frozen Mexican food entrees in California was paying extremely high surcharges on their wastewater discharge due to the COD, TSS and FOG levels. Laboratory testing with Floccin 1105 showed that the results could drastically reduced. The following shows the reduction accomplished in using the Floccin ...


    By Integrated Engineers Inc.

  • 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 techniques, which are used to quantify the amount of swell. A site investigation was conducted to obtain hand-carved block specimens from a fresh ...


    By ASTM International

  • Index of Joint Condition for PVC push-fit joints

    The Index of Joint Condition (IJC) for polyvinyl chloride (PVC) push-fit joints, discussed in this article, was derived from installation guidelines and from destructive laboratory tests. The IJC is presented in a graphical framework and is a powerful tool to employ in order to visualize and compare, in situ, results obtained during condition assessment of PVC joints. The graphical results ...


    By IWA Publishing

  • 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

  • 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 Engineering of the Politecnico di Torino. The pluviator proved satisfactory in reconstituting small-size specimens because it provided a very high degree of ...


    By ASTM International

  • NMS Laboratories Chooses Qualtrax

    National Medical Services, popularly known as NMS, has chosen Qualtrax as its Quality and Compliance Management Solution. NMS is a world leader in laboratory testing and services, offering testing across many different disciplines and fields. Qualtrax is proud to help them maintain ABFT, ASCLD/LAB International ISO/IEC 17025, CAP ISO 15189, CAP-LAP, and ...


    By Qualtrax Inc

  • A Method for Estimating the Excavatability of Caliche

    A simple method for classifying caliche with respect to excavatability is presented. The method is based on the results of a laboratory testing program from which two empirical equations were derived, one relating seismic velocity to size-corrected point load strength index, the other relating seismic velocity to a newly proposed parameter, the comminuted uniformity coefficient. The effect of ...


    By ASTM International

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