NM CID GF-4 Practice Questions - New Mexico CID GF-4 Drainage Or Flood Control Systems Contractor Examination Exam

When consolidating structural concrete in a culvert headwall with an internal vibrator, the operator should:

Insert the vibrator vertically at close spacings, hold it until air escapes, and withdraw slowly; do not use it to drag concrete horizontally along the form Lay the vibrator on the rebar and walk away so it "soaks" the pour Vibrate only the top 1 inch so the surface looks wet Use the vibrator to push a stiff pile of concrete 10 feet down the wall

Correct Answer:

Insert the vibrator vertically at close spacings, hold it until air escapes, and withdraw slowly; do not use it to drag concrete horizontally along the form

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