Compressive Strength Results
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According to Compressed Earth Blocks - Volume II. Manual of design and construction (GTZ, 1995, 148 p.), the wet compressive stregth of CEB blocks is between 1-4 MPa, or about 150-600 psi.
This source states that CEBs have been tested at 700 psi right after production.
Here are some data points for soils from Factor e Farm - 700+ on unstabilized and 1200 on stabilized reject limestone bricks:
http://blog.opensourceecology.org/2010/06/ceb-compressive-strength-test-results/