Clay, Please see the attached concrete testing results for the hangar slab. You'll see that the 28 day breaks all exceed the minimums. Regards, Corey The message is ready to be sent with the following file or link attachments: 28 day cilynder tests.pdf Note: To protect against computer viruses, e-mail programs may prevent sending or receiving certain types of file attachments. Check your e-mail security settings to determine how attachments are handled.