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05.05.2011, 12:56 AM
And the results are......
poor, lol
The masses were all 235g with the target of 270g (not too bad I think).
One block took an ultimate load of 12,100lb and one took 14,800lb. To reach the speced 50MPa they should have held 30,000lb. LOL
They averaged 23.18MPa, or, 3362.5psi. About the same strength as standard concrete (3000-4000psi) but a little lighter.
I think the main fault was that the coarse aggregate was too large, and too smooth. There were no fractured plastic pieces. We should have found something a little smaller, more angular, and a rougher surface.
Oh well, the other teams didn't get very strong either. I heard one gal got right up to 30 kips though....
I'll find out more about other mixes in class tomorrow.
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