Soil Shake Test
We will be digging up soil to use in the Cob mixture from around Camp! This is great because the material is on hand and doesn’t come from a factory that burns a LOT of energy and natural resources to produce it.
What is soil?
From the National Geographic Website:
Soil is composed of both biotic—living and once-living things, like plants and insects—and abiotic materials—nonliving factors, like minerals, water, and air.
But what is our Camp soil made of?
Morgan is currently researching how to assess what our Camp soil is composed of. This is done by doing a Soil Shake Test.
To find the ratio of my sample I measure the total height of the layers, plus the height of each individual layer.
Divide each layer height by the total height and multiply by 100 to get your percentages:
Total Height: 1 1/4”
Clay: 1/4” = 20%
Silt: 3/8” = 30%
Sand: 5/8” = 50%
This sample looks very promising!
We will be using it to make some Cob and test its strength. If the soil at Camp has a lack of sand or clay, we can always add some to get the right ratio, but a Shake Test will let us know what we are working with.
If you have access to soil at home, do a Shake Test of your own and send us your results! Be sure to include your location so we can map our soil tests on this page.
We made some test Cob bricks using this soil, see the Cob Page for details.