Civil engineer guide to fighting positions, shelters, obstacles

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AFH 10-222 Volume 14 1 August 2008 152 Figure A3.3. Roll or Thread Test Technique. Table A3.6. Roll or Thread Test Results and Indications. Result Soil can be molded into a ball or Indication cylinder and deformed under very firm finger pressure without crum- High plasticity (CH) bling or cracking Soil can be remolded into a ball, but it cracks or crumbles under finger pressure Soil cannot be lumped into a ball or cylinder without breaking up Soil forms a soft, spongy ball or thread when molded Soil cannot be rolled into a thread at any moisture content Medium plasticity (CL) Low plasticity (CL, ML, or MH) Organic material (OL or OH), also peat Non-plastic soil (ML or MH) Note: Micaceous silts and sands may be rolled due to the flaky nature of the mica
AFH 10-222 Volume 14 1 August 2008 153 A3.3.9. Ribbon Test. This test is also performed only on material passing the No. 40 sieve. A representative portion of the sample is mixed with water until it can be molded or shaped without sticking to the fingers. Form a roll of soil about ½- to ¾-inches in diameter and 3 to 5 inches long. Lay the roll across the palm of one hand (palm up), and starting at one end, squeeze the roll between the thumb and forefinger over the edge of the hand to form a flat, unbroken ribbon about 1/2 to 3/4 inches thick. Allow the ribbon as formed to hang free and unsupported (Figure A3.4). Continue squeezing and handling the roll carefully to form the maximum length of ribbon that can be supported only by the cohesive properties of the soil. Use Table A3.7 to draw conclusions. Figure A3.4. Ribbon Test Technique. Table A3.7. Ribbon Test Results and Indications. Result Indication Sample holds together for a length Highly plastic and highly com- of 8 to10 inches without breaking Soil can be ribboned only with pressive (CH) difficulty into 3-inch to 8-inch lengths Low plasticity (CL)
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Civil engineer guide to fighting positions, shelters, obstacles

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