Thumb penetration test











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For a more numeric measurement, the pocket penetrometer test can be used. Examples of type A soil include clay, silty clay, sandy clay, and clay loam. The Department of Labor does not endorse, takes no responsibility for, and exercises no control over the linked organization or its views, or contents, nor does it vouch for the accuracy or accessibility of the information contained on the destination server. You will also see how to test the soil using three of the most common methods.

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Soils And Testing Exam

Cohesive soil contains fine particles and enough clay so that the soil will stick to itself. OSHA requires that employers have a competent person to determine the soil type. As you can see, Type A soil will measure at least 1. Soil samples should be typical of the surrounding soil in the excavation, and additional samples should be taken as the excavation gets deeper. For Type B Soil, the reading will be between 0. First, as the soil is being excavated, does it come out in clumps, or is it granular. To conduct the test, push the piston into the soil until it reaches the engraved line.

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Field soil testing flashcards

The video you are about to see shows one of the steps, classifying soil, that employers must follow so that trenching work can be done safely. Back to Top Back to Top. After performing a visual test, you can use the plasticity test to determine if the soil is cohesive or granular. OSHA requires that employers have a competent person to determine the soil type. Type A is the most stable and Type C is the least stable soil.

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Description: One cubic yard of soil can weigh as much as a car, 3, pounds, and comes in many varieties. Notice how the sample stays in one piece. If any of these conditions are met, the soil cannot be classified as Type A. There can be some variability in these results, so it's a good idea to run this test on a few soil samples from the same part of the excavation, just to make sure your results are consistent. Soil can either be cohesive or granular. To perform the thumb penetration test, simply press the end of your thumb into a fresh clump of soil. Now look at what happens when the soil is not cohesive. You will also see how to test the soil using three of the most common methods. For a more numeric measurement, the pocket penetrometer test can be used.
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