soil testing Articles

  • Use of Fuzzy Control in Automated Soil Testing

    A servo-control algorithm that uses fuzzy logic has been developed for automated soil testing. The algorithm emulates the reasoning process of an experienced operator in controlling the pressure. The amount of pressure adjustment and time delay between adjustments is determined by fuzzy inference matrices. The fuzzy control logic provides a framework for the development of intelligent control ...


    By ASTM International

  • Cubical Triaxial Apparatus for Soil Testing

    Three different principal stresses can be applied in fixed directions to a cubical specimen in this apparatus. The requirements and the construction and operation principles for the cubical triaxial apparatus are presented. The loading system and the deformation measurement principles are described, and procedures for preparing sand and clay specimens are presented. The advantages and limitations ...


    By ASTM International

  • A Flexible Strain Gage for Soil Testing

    A novel strain gage for the measurement of soil deformation is introduced. The gage is based on the principle that the change in the length of a coil is linearly related to the change in its inductance. The gage measures a wide range of strains and can be easily installed on a soil specimen in any direction; therefore, it is particularly suitable for the measurement of deformations of in situ ...


    By ASTM International

  • Minneapolis Offers Free Soil Testing to Raise Public Awareness of Lead Hazards

    In 1998, the City of Minneapolis designed and implemented an innovative public outreach program to provide free access to soil testing for lead content to all Minneapolis residents. Soil testing kits were made available through local hardware stores, gardening centers and community groups. Citizens could either bring in samples to local merchants where city employees performed on-the-spot ...

  • Evaluation of Allowable Pressure Under Foundations

    To understand the surcharge effect on test-loading results, water-saturated loessial soils were tested by bearing plates of different sizes in open pits and boring holes. All pit bottoms were accurately prepared for experiments. The surcharge around the bearing plate with an area of 600 cm2 was simulated by special equipment. Results of field experiments showed that the proportionality limit for ...


    By ASTM International

  • A Multiple Purpose Soil Testing Apparatus

    A relatively compact soil testing system that is capable of performing monotonic/cyclic triaxial and torsional simple shear tests has been developed. A high-torque direct-drive, servo/stepper motor is used to provide the driving force. Under the servo mode, the motor could be controlled to provide a constant torque, which is used in stress-controlled tests. Strain-controlled tests are conducted ...


    By ASTM International

  • Compressibility Characteristics of Gypseous Sandy Soils

    Soils containing gypsum as a cementing agent are affected considerably when subjected to changes in water content. Seepage through sandy gypseous soil causes serious damage to foundations built on such soils. A testing program was conducted on undisturbed soil specimens with three different gypsum contents to study the compressibility characteristics of such soils. The testing program included ...


    By ASTM International

  • Cohesive Soil Behavior Under Random Excitation Conditions

    A testing program was undertaken in which cohesive soil at different confining pressures was tested in a resonant column device using random torsional excitation in addition to conventional sinusoidal excitation. The damping and shear modulus from random loading testing were determined by both the power spectral density function and the transfer function method. Evaluation of the dynamic soil ...


    By ASTM International

  • Complex Stress Paths and Validation of Constitutive Models

    The solution of complicated soil engineering and soil structure interaction problems requires the use of realistic constitutive equations and failure criteria. A recent international workshop held at Case Western Reserve University was aimed at assessing the predictive capability of presently available models for granular noncohesive soils. The results of tests conducted on hollow cylinders at ...


    By ASTM International

  • Horizontal and Vertical Swell Pressures from a Triaxial Test: Feasibility Study

    Horizontal and vertical swell pressures of some anisotropic undistrubed soil specimens are measured in a double chamber triaxial cell. The equipment is also capable of measuring consolidation and strength parameters of the soil. Preliminary test results indicate no difference in swell pressure between vertical and horizontal orientations of the specimen when subject to no volume ...


    By ASTM International

  • Response of corn and cotton to starter phosphorus on soils testing very high in phosphorus

    Phosphorus from agricultural lands poses a problem in water resources. In 2003, more than 48% of soil samples submitted to the North Carolina Department of Agriculture and Consumer Services (NCDA&CS) soil testing laboratory tested very high in soil P (>120 mg dm–3 P). As soil test P increases, off-site P loss increases, through erosion, soluble P runoff, or leaching. On soils testing above high ...

  • How To Complete A Soil Test The Right Way

    A soil test should be one of the first steps you take in your landscape plan. Many of us never take this important first step, which contributes, to wasted resources and wasted time. The U.S. Department of Agriculture says soil testing is an “essential” tool that provides information on fertility and pH. Testing also ...

  • Minimum Test Specimen Mass for Moisture Content Determination

    Minimum test specimen masses are recommended for determining the moisture content of soils. The specimen mass is dependent on the accuracy required, the maximum particle size present in the soil being tested, and the estimated moisture content of the soil. Equations are presented to calculate the minimum specimen mass required and nominal values are shown in a ...


    By ASTM International

  • Case Study: Highland Elementary School

    Prior to constructing new classroom buildings on newly acquired property adjacent to Highland Elementary School, the California Department of Toxic Substance Control (DTSC) requires that soil testing be conducted as part of a 'Preliminary Endangerment Assessment' (PEA). Ellis is administering testing of soils near existing buildings (lead), and beneath the location of a former hydraulic elevator ...

  • Biodegradation of fenpropathrin by a novel Rhodopseudomonas sp. strain PSB07-8

    The aim of our study was to isolate a fenpropathrin-degrading bacterial strain and to determine its effectiveness in bioremediating fenpropathrin-contaminated soil in the laboratory. We isolated a bacterial strain from soils and named it as PSB07-8, and showed that this organism was able to degrade pyrethroid pesticide fenpropathrin. The organism was identified as a strain of Rhodopseudomonas ...


    By Inderscience Publishers

  • New Field Test for Lead (Pb2+) in Soil

    Field tests for the detection of lead in soil are not frequently accepted, since the tests are rather cumbersome or not reliable for screening determinations. Recently, we developed the LEADQuick field test kit for the detection of lead in water with 3 g/L sensitivity. This test is further modifiedto detect lead in soil with a sensitivity 0.03 g. We developed an extraction protocol using ...

  • Determination of Collapse Potential of Soils

    A review of various criteria that have been proposed to identify collapsible soils and test techniques, which are used to quantify the amount of collapse, is presented. The results of a series of laboratory single and double oedometer collapse tests conducted on three metastable loess soils are presented to illustrate problems associated with investigating collapse behavior of soils. Guidelines ...


    By ASTM International

  • Determination of Deformation Properties of Collapsible Soils

    Mechanical properties of loessial soils are the functions of their in-situ physical conditions, geological history, as well as actual load distribution at the site of interest. It is well known that the bearing capacity of loesses and loessial soils decreases with an increase in their porosity and water content. Physical and mechanical properties of soils can be determined by different laboratory ...


    By ASTM International

  • A Procedure for Determining Volumetric Shrinkage of an Unsaturated Soil

    Measurement of unsaturated soil volumes can be used to monitor drying shrinkage and allows calculation of the volumetric air content/moisture content relationship. From this relationship, the onset of significant desaturation can be established as a bound to the validity of conventional soil testing under saturated conditions and of conventional analysis procedures for the particular ...


    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

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