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Compaction forces of up to 215 pounds per square inch There, water pressure, a measure of force per unit of surface area, bears down with a crushing 500 pounds per square inch (psi). According to Solberg, papercrete blocks are capable of a compressive strength--the measure of how much weight can be put on the material--of 260 pounds per square inch, compared to approximately 1,800 pounds per square inch for concrete block. |
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