Humboldt Catalog - Soil-Field Section - Comlibris

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Soil— Field 8 Compaction, Moisture/Density H-4114.3F 1.800.544.7220 • www.humboldtmfg.com Electrical Density Gauge (EDG) wet and dry density, gravimetric moisture content and percent compaction Electrical Density Gauge— H-4114.3F The Electrical Density Gauge (EDG) is a non-nuclear alternative for determining the moisture and density of compacted soils used in road beds and foundations. The EDG is a portable, battery-powered instrument capable of being used anywhere without the concerns and regulations associated with nuclear safety. Its user-friendly, step-by-step menu guides the user through each step of the testing procedure and cautions the user when values do not correspond to established curves for the material being tested. Easy-to-use, the EDG can be used as a construction aid to monitor day-to-day compaction operations by providing performance and measurement results highly comparable to those achieved with traditional methods, including the nuclear gauge and/or a sand-cone and oven moisture test combination. When conducting a test, the EDG measures and displays the results for wet and dry density, gravimetric moisture content and percent compaction. For the contractor the advantages of using the EDG are: • it does not require a highly-trained or licensed technician, • it does not require special handling for shipping or regulatory compliance for hazardous materials • it is easy to learn and easy to use with its step-by-step menu • It is accurate and repeatable with results that mirror known testing methods The EDG measures the electrical dielectric properties and moisture levels of compacted soil using high, radio frequency traveling between darts driven into the soil being tested. The dart's depth of penetration positively determines the depth of measurement. ASTM Standard in process, D-18 Committee Darts are available in 4, 6, 8, 10 and 12” lengths. In addition, the dart’s have been designed with a taper, which ensures a continual positive contact with the soil for accurate measurements. During the testing procedure, four tapered electrodes (darts) are driven into the ground in a cross pattern using the supplied template. Between the two sets of two tapered darts, four point-to-point electrical measurements are made and the electrical characteristics averaged. The dielectric properties that are measured by the unit are compared to a “soil model”, which has been developed and programed into the unit prior to testing. These soil models are required only once for each soil type. The soil model is used as a calibration reference during the testing procedure. It is developed by establishing a curve of measured dielectric properties for different densities and moisture combinations of the actual soil to be tested or a similar material. This soil model is used by the unit through a proprietary correction algorithm to automatically determine the wet and dry density, gravimetric moisture content and percent compaction values for the material being tested. In addition, the temperature probe, which is inserted into the material being tested ensures accurate results by compensating for changes in recorded temperatures. Similar to nuclear gauges, proctor numbers for optimum compaction may be input into the gauge, which would allow for percent compaction to be automatically calculated and displayed at the end of each test. The Proctor numbers would be input into the gauge during the development of the soil model. When determined, this value is entered into EDG to enable the computation of percent compaction.
www.humboldtmfg.com • 1.800.544.7220 Features Include • Alternative to Nuke Gauges—No sources! • Licensed technician not required • Easy to learn and simple to use • Menu-driven operation • Uses reliable and well-established point-to-point RF technology • Accurate, robust and lightweight • Accurate and repeatable results in similar times as nuclear gauges Application Density, moisture and acceptance testing of compacted materials for: • Embankments and fills • Roadway subgrades, subbases and bases • Utility backfills and trenches • Landfills • All construction soils Darts are designed in various lengths to correspond to different lift heights. They are sold in sets of 4. 4" Dart— H-4114.4 6" Dart— H-4114.6 8" Dart— H-4114.8 10" Dart— H-4114.10 12" Dart— H-4114.12 EDG Principles of Operation The EDG measures the electrical dielectric properties of compacted soil, including moisture levels, using a high radio frequency traveling between sets of electrodes. The readings achieved from this process are then compared to a “soil model”, which has been previously developed for the soil being tested or soils deemed to be similar in properties to that being tested. The soil model, which is programed into the unit, is used to determine the percent compaction, wet and dry density and gravimetric moisture content of the soil being tested. The Soil Model To develop a soil model, it is necessary to develop a curve based on at least 3 or as many as 20 tests on the material in question at various densities and moisture readings using the EDG. At the same time, a coordinated test using a sand cone, nuclear gauge or voluvessel is also taken so a correlation between the EDG reading and actual physical data can be made. Once a soil model is developed it can be saved in the unit and recalled to test similar material in the future. For accurate results, it is necessary to develop soil models for the various materials that may be encountered, however, once these models are developed they can be used quickly and accurately in much the same manner as using a nuclear gauge. Time spent developing accurate soil models Specifications Compaction, Moisture/Density H-4114.3F with all components except for hard carrying case. Electrical Density Gauge— H-4114.3F includes: Console; 4-tapered 6" darts; hammer; soil sensor and cables; template, temperature probe, battery charger and hard-body case for all components. Wet Density Range typical compacted earth sites range Dry Density Accuracy within 3% of standard tests Moisture Content Range typical compacted earth sites range Moisture Content Accuracy within 2% of standard tests Operating Temperature 0-50°C Ambient Operating Humidity 5-90%, non-condensing Power rechargeable 12V lead acid gel cell Battery Life approx. 8 hrs. with full charge Battery Charger 110-240 V 50/60Hz Dimensions console: 13.5" x 12" x 6" (343 mm x 305 mm x 152mm) Net Weight console: 11 lbs. (5kg), accessories: 4 lbs. (1.8kg) will result in accurate and repeatable readings being obtained in future tests. To aid in the development of soil models a detailed DVD is provided with the EDG, which explains how to develop soil models in step-by-step directions. Using the EDG The EDG, with its step-by-step menu is easy and fast to use. The technician need only follow the instructions displayed on the unit as it guides him through each test. The operator would begin by opening a new "jobsite" in the EDG and associating an appropriate soil model to it. The operator would then place the unit on the ground and connect the darts and temperature probe. Next, the dart template provided would be placed on the soil and darts hammered into the ground in the corresponding holes of the template. The electrodes would then be attached to the four darts in sequence as detailed on the unit’s screen and readings taken. Once the measurement sequence is done, the unit will display the representative density and moisture content. The dart's depth of penetration positively determines the depth of measurement. Darts are available in 4, 6, 8, 10 and 12” lengths. In addition, the dart’s have been designed with a taper, which ensures a continual positive contact with the soil for accurate measurements. Soil— Field 9
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Humboldt Catalog - Soil-Field Section - Comlibris

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