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2013SumShotcreteEMag

test panels with the right size reinforcing bars fication session. Something may go awry and you (refer to Fig. 1) and have them correctly spaced will need to react or switch gears. Having an apart. (I have found No. 10 bars No. 30M in audience watch you perform may be unfavorable, panels during a session instead of the required especially when there are pumpability issues, No. 8 bars No. 25M.) Verify the panel integrity. nozzle plugging, overhead fallout, or air-com- All these items are listed in the nozzleman cer- pressor troubles, which are not things you want a tification workbook (CP-60). Rushing around future client to see. Always separate a certification and setting up the test site while the examiner is session from a pretest or mockup session. Too waiting can set the wrong tone for the entire many eyes watching your every move in shot- session. It also puts extra stress on the already crete testing takes the focus off the tasks at hand nervous nozzlemen. (refer to Fig. 3). Core Drilling A handheld grinder with a 4 in. (102 mm) core bit is not a proper core drill setup. In fact, it will put you in the hospital with broken wrists. It is a good idea to have more than one core drill rig with new bits that have been tested prior to the session. If your crew does not core anything or has never seen a core drill in action, hire somebody to do it for you (refer to Fig. 2). Many cores for inspec- tion have been wrecked by novices on the coring rig. Panel Movement If you find yourself underneath the shotcreted panel on the floor, it usually means you tried to move it by yourself or without adequate support and help. SLOW DOWN. Be safe and take your time. Also, do not be in a rush to trowel off excess concrete while the material is still in its plastic state. You receive no bonus points for the best-looking bottom of a panel. Besides, rushing to work or trowel the fresh shotcrete may also cause undesirable movement in the panel, which leads to cracking or other internal damage. Ask Questions During the educational portion of the session, please ask questions. I know the testing makes everyone uncomfortable, and examiners are not allowed to aid or assist in any way during testing. This means you must ask questions beforehand, even if you think those around you may know the answer, or you feel too embarrassed to say something. Most people taking the test have similar questions. Those who ask “what does this mean?” or “how will the test go and what should I look out for?” are the ones who pass. Show and Tell Do not invite inspectors, job owners, or future contract parties to your certi- Shotcrete • Summer 2013 23


2013SumShotcreteEMag
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