Soil Mix Conditions
The soil mix is 15-40 percent non-expansive clay, 25-40 percent silt powder, and sharp sand to small gravel content of 40-70 percent. The more modern machines do not require aggregate (rock) to make a strong soil block for most applications. Soil moisture content ranges from 4 to 12 percent by weight. Clay with a plasticity index (PI) of up to 25 or 30 would be acceptable for most applications. The PI of the mixed soil (clay, silt and sand/gravel combined) should not exceed 12 to 15; that is the difference between the Upper and Lower Atterberg limits, as determined by laboratory testing.
Read more about this topic: Compressed Earth Block
Famous quotes containing the words soil, mix and/or conditions:
“Forever float that standard sheet!
Where breathes the foe but falls before us,
With Freedom’s soil beneath our feet,
And Freedom’s banner streaming o’er us!”
—Joseph Rodman Drake (1795–1820)
“Much of our reading, much of our labor, seems mere waiting: it was not that we were born for. Any other could do it as well or better. So little skill enters into these works, so little do they mix with the divine life, that it really signifies little what we do, whether we turn a grindstone, or ride, or run, or make fortune, or govern the state.”
—Ralph Waldo Emerson (1803–1882)
“Among the laws controlling human societies there is one more precise and clearer, it seems to me, than all the others. If men are to remain civilized or to become civilized, the art of association must develop and improve among them at the same speed as equality of conditions spreads.”
—Alexis de Tocqueville (1805–1859)