Hi Thomas - I think testing in opposite directions is a good idea. What is the biggest size of aggregate? Add stress to the spreadsheet so you have an estimate of breaking. Peter
Hi Thomas - You will be able to calculate the stress in the beam at the applied load. From concrete data you will find a typical tensile stress of the material. Here's a grout with a flexural strength of 10MPa. So load to 5MPa.... Peter
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