Placing Reinforcing Bars Flashcards
Main purpose for steel reinforcement is to resist.
2-1. Tension Strenght.
After piles for each footing are driven in and cut off at the same level. This is usually about how many inches above the bottom of the footing?
3-3. 6”
Diagonal tension usually cracks near the support and extends upward and outward at an angle of about _________ degrees to the top.
5-3. 45.
Concrete protection of reinforcemetn is measured ______________?
5-10. From the face of the concrete to the outside of teh reinforcement.
Requirements by ASTM for bar identification for each producer: __________________
6-3. Symbol for the producer’s mill size number of the bar, symbol or marking for steel type and marking for grades 60 and 75.
Length beam bolsters are furnished in: _________________?
10-4. 1”, 1 1/2”, 2” to 5”; heights in increments of 1/4” in lenghts of 5’.
Bar that has the most tolerance for placemennt _________?
11-4. Longitudinal Bar.
What is the maximum tolerance spacing between bars in walls and slab floors ____________.
11-5. No greater than 3 times the thickness of the slab or wall. (1st para. next to last sentence).
Tests have shown that tack welding can reduce the strength of a bar to ____________ percent of its capacity.
11-27. 35% to 40%.
In a mat slab the rebar shold be placed how far above the mud slab _________?
12-10. 3” above.
MAX spacing for wall reinforcemetn ties.
12-13. No more than 4 to 6 feet apart.
What is used to maintain the position of reinforcemetn steel ina wall.
G-20. Tie Wires.
Distance the first bolster is palced form the edge fo the formwork.
12-6. 18”.
A joist chair generally carries how many reinforcing bars.
13-6. 2.
