Page 80 - RoadCem Manual - PCT BV

Figure 4.27 Soil Texture = LOAM.
Figure 4.28 Soil Texture = CLAY.
Figure 4.29 Soil Texture = SANDY LOAM.
Figure 4.30 Soil Texture = CLAY LOAM.
In the absence of particle size analysis, soil texture can also be estimated by feel and this is usually what happens in the field during field surveys.
The feel and appearance of the textural groups illustrate factors used in determining the texture of a soil in the field and also assist in field classification work. Note that forming a cast of soil, dry and moist, in the hand and pressing a moist ball of soil between the thumb and finger constitute two major field tests to judge soil texture. Samples are given below.
SAND
Individual grains can be seen and felt readily. Squeezed in the hand when dry, this soil will fall apart when the pressure is released. Squeezed when moist, it will form a cast that will hold its shape when the pressure is released but will crumble when touched. (Figure 4.31)
LOAMY SAND
Consists largely of sand, but has enough silt and clay present to give it a small amount of stability. Individual sand grains can be seen and felt readily. Squeezed in the hand when dry, this soil will fall apart when the pressure is released. Squeezed when moist, it forms a cast that will not only hold its shape when the pressure is released but will withstand careful handling without breaking. The stability of the moist cast differentiates this soil from sand. (Figure 4.32)
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