• CEBs_photo

COMPRESSED EARTH BLOCKS – BASIC RECIPE

  • 15-40% non-expansive clay
  • 25-40% silt powder
  • 40-70% sharp sand to small gravel content

The more modern machines do not require aggregate (rock) to make a strong soil block for most applications. Soil moisture content ranges from 4-12% 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.