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In-Depth Descriptions Of 3 Soil Resistivity Testing Techniques

Posted by AGI on Nov 23, 2016 12:00:00 AM

Soil resistivity testing is performed for a variety of important applications, including:

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Determining Groundbed Location For Cathodic Protection: What You Need To Know

Posted by AGI on Nov 17, 2016 8:00:00 AM

Cathodic protection is a method used to reduce steel oxidation through an electrochemical process. Cathodic protection is used to protect buried or submerged pipelines, bridges, and large steel structures from corrosion, breakdown, and rust when an electrolyte (like water with salt and minerals) is present.

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The Exploration Of Aggregate Materials Using Geotechnical Techniques

Posted by AGI on Nov 16, 2016 6:59:37 PM

Aggregate materialslike sand, gravel, crushed stone, slag, and recycled concrete—provide bulk and strength to concrete or asphalt. Large aggregate quarries and sand and gravel pits are located around most populated areas because of the high cost of transporting aggregate. (In fact, the cost of transportation from the mine to the consumer may even be higher than the actual cost of the aggregate.)

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When & Why To Use ASTM G57 For Soil Testing

Posted by AGI on Nov 15, 2016 8:00:00 AM

The ASTM G57 standard (also known as the four-pin Wenner method) is used to determine the properties of soil. 

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Behind The Scenes Of Groundwater Exploration With Electrical Resistivity

Posted by AGI on Nov 14, 2016 8:10:18 AM

Early Methods Of Groundwater Exploration

To best understand how electrical resistivity surveys for groundwater exploration work today, it’s important to understand where resistivity testing began. 

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Marine Resistivity Surveys: Breaking Down The Benefits & Use Cases

Posted by AGI on Nov 10, 2016 3:04:03 PM

Having an accurate image of the subsurface beneath a body of water is beneficial in myriad use cases, including: 

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An Overview Of The IEEE Standard 81 Fall-Of-Potential Grounding Test

Posted by AGI on Sep 28, 2016 1:05:46 PM

The Institute of Electrical and Electronics Engineers (IEEE) Standard 81-2012 “Guide for Measuring Earth Resistivity, Ground Impedance, and Earth Surface Potentials of a Grounding System”, suggests the fall-of-potential grounding test to be used to evaluate the capacity of an electrical grounding system—it is often used by subcontractors to power engineers. 

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How To Test For Land Subsidence Before Breaking Ground

Posted by AGI on Sep 12, 2016 11:39:23 AM

Land subsidence is the act of land moving downward, or subsiding. In many cases, land subsidence can signify the formation of a sinkhole, which you can read about in this article. Land subsidence could also signify the presence of an expansive clay. 

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The 7 Most Common Signs Of Sinkholes & How To Test For Them

Posted by AGI on Sep 12, 2016 11:35:39 AM

Water in the atmosphere reacts with carbon dioxide and forms a weak carbonic acid. As the slightly acidic rainwater moves through fissures in the limestone, it begins to dissolve and widens the fissures—which eventually creates air or water filled pockets. When those pockets become expansive, they’re called “caves” or “voids.” This is a common natural phenomenon in limestone or dolomite known as karstification—but it can be dangerous, expensive, and life-threatening when the ceiling of a void weakens and caves in. This is known as a “sinkhole.” 

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Electrical Resistivity: Everything You Need To Know

Posted by AGI on Sep 12, 2016 11:29:19 AM

At the most basic level,
electrical resistivity (ER) (as used in geophysics) is the measurement of ground variations gathered by applying a small electric current across an array of electrodes.

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