Under NAC 624.310, what work is authorized by a Nevada C-14A Reinforcing Steel license?
Post Tensioning
Question · Easy
Six feet: a hard-hat anthem
Short
What is an unbonded monostrand post-tensioning tendon?
What is the usual strand for U.S. unbonded slab post-tensioning?
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What is the primary purpose of the extruded plastic sheathing on an unbonded tendon?
When is an encapsulated unbonded PT system required instead of a standard (non-encapsulated) system?
Question · Medium
On an unbonded tendon, what is the difference between the live (stressing) end and the dead (fixed) end?
What is the function of a pocket former at a stressing-end anchor?
Why is P-T coating (grease) applied to unbonded strand under the sheathing?
In a typical two-way unbonded PT slab, what is a banded tendon group?
Which field practice is required while placing unbonded tendons?
How is jacking force transferred into an unbonded monostrand at the stressing end?
A forklift nicks the plastic sheath on a tendon before concrete placement. What should the crew do?
Where are intermediate anchors typically required on a long unbonded tendon?
When may tendon tails be cut at the stressing pockets?
When may unbonded tendons be stressed?
What equipment check is required before a stressing crew starts jacking?
What elongation tolerance do ACI 318 and PTI field practice use for unbonded tendons unless the engineer specifies otherwise?
To what precision does the PTI unbonded field manual say elongation should be measured?
Why is Grade 270 prestressing strand made of seven wires?
When is two-end stressing typically required on an unbonded tendon?
Who sets the order in which tendons on a floor are stressed?
After an accepted tendon is cut, how is the stressing pocket finished?
For unbonded prestressing tendons in an interior slab not exposed to weather or earth, ACI 318 minimum concrete cover to the sheathing is generally:
A parking-garage slab in a Nevada winter climate that uses deicers is specified as an aggressive PT environment. Which hardware set is correct?
What mild-steel reinforcement is commonly required immediately behind a PT stressing or fixed anchor?
How is the vertical drape (profile) of an unbonded tendon held before the pour?
A plumber wants to torch-cut an opening through a PT slab. What is the C-14A / PT concern?
What is seating (wedge-set) loss at an unbonded stressing anchor?
Which information belongs on a PT stressing record for each tendon?
A 1/2-inch Grade 270 strand has a minimum breaking strength of 41.3 kips. What jacking force is 0.80 fpu?
Question · Hard
Immediately after transfer (after wedge seating), ACI 318 limits unbonded-strand stress to 0.70 fpu. For 1/2-inch Grade 270 strand (MUTS = 41.3 kips), that force is nearest:
A 50-foot unbonded 1/2-inch tendon is jacked to 33,000 lb. Using A = 0.153 in² and E = 28,500,000 psi, theoretical elongation δ = PL/AE is nearest:
Calculated elongation for a tendon is 5.00 inches. Using the ACI/PTI ±7 percent tolerance, the acceptable measured range is nearest:
A beam has sixteen 1/2-inch Grade 270 unbonded tendons, each jacked to 33 kips. What is the total jacking force in that beam?
An 80-foot unbonded 1/2-inch tendon is jacked to 33,000 lb. Using A = 0.153 in² and E = 28,500,000 psi, theoretical elongation is nearest:
A 0.6-inch Grade 270 strand has a minimum breaking strength of 58.6 kips. The 0.80 fpu jacking force is nearest:
Calculated elongation is 3.63 inches. The crew measures 4.20 inches at the specified 33-kip gauge pressure. What is the correct action?
A Nevada contractor with only a C-14A license is asked to erect steel joists and metal deck. What is the correct response?
Reinforcing Steel
What is the nominal diameter of a #5 reinforcing bar?
What is the standard ASTM/CRSI weight of a #4 bar?
What does Grade 60 mean on a reinforcing bar?
Which ASTM bar is the low-alloy grade intended for welding when the drawings allow it?
Why do reinforcing bars have deformations (ribs)?
What is the ACI 318 minimum concrete cover for nonprestressed bars in concrete cast against and permanently exposed to earth?
For #5 bars in an interior slab not exposed to weather or earth, ACI 318 minimum cover is:
For #6 bars in concrete exposed to earth or weather (but not cast against earth), ACI 318 minimum cover is:
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