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:
“Weather is not as important as good soil, and good soil is not as important as human harmony.”
—Chinese proverb.
Mencius.
“There is nothing in the world that I loathe more than group activity, that communal bath where the hairy and slippery mix in a multiplication of mediocrity.”
—Vladimir Nabokov (1899–1977)
“Under conditions of tyranny it is far easier to act than to think.”
—Hannah Arendt (1906–1975)