02B - Concrete - Placing Reinforcing Bars Flashcards
(30 cards)
What classification of reinforcing rod supports is used in situations where there will be maximum exposure but no grinding or sandblasting is required?
Class 1A (Placing Reinforcing Bars Page 10-1 – 9th Edition)
The maximum spacing for rebar in a 6” thick wall should not exceed _______inches on center.
18 inches (Placing Reinforcing Bars Page 11-5
Formula: Maximum spacing is 3 times wall or slab thickness.)
When placing reinforcing steel in a steel mat, where may ties be placed if the spacing is not specified?
At every fourth or fifth intersection (Placing Reinforcing Bars Page 11-39)
Short bars tied at right angles to main reinforcing bars in a floor slab are called “___________ bars”.
Temperature (Placing Reinforcing Bars Page 6-8)
Beam bolsters are typically provided in ___________ feet lengths.
5 (Placing Reinforcing Bars Page 13-6 – Eight Edition)
Raising the bottom bars by ½ inch more than specified in a 6-inch-thick slab could reduce its load carrying capacity by ____%.
20 (Placing Reinforcing Bars Page 11-3)
Which of the following items is NOT required to be identified by the markings on reinforcing steel?
A set of numbers indicating the date of fabrication (Placing Reinforcing Bars Page 7-4)
The minimum standard reinforcing bar size is a ______bar.
either #3 or #4 (Placing Reinforcing Bars Page 7-1
The above answer # 3 bar is correct for this question but there is an exam question where a # 4 bar is the correct answer for the same question. I think that on this exam question that a # 3 bar is not listed as an answer)
What would be the length of the lap if a # 5 reinforcing bar is spliced 30d?
18 ¾ inches (Placing Reinforcing Bars Page 11-18
Formula: #5 = 5/8” = .625” x 30 = 18.75” = 18 3/4”)
A # 5 reinforcing bar that will be exposed to earth and weather should have a minimum of ____inches of concrete cover.
1 ½ (Placing Reinforcing Bars Page 11-3)
Stirrups are used in a concrete beam to resist:
Shear (Placing Reinforcing Bars Page 6-4)
How many pieces of rebar does a beam bolster chair support?
2 (Placing Reinforcing Bars Page 13-6)
What is used in concrete walls to hold metal reinforcing in place?
Tie wire (Placing Reinforcing Bars Page 11-36)
What is the minimum reinforcing bar lap or splice for a # 5 bar with 40D?
25 inches (Placing Reinforcing Bars Page 11-18
A # 5 bar is 5/8 of an inch or .625 of an inch x 40 diameters splice is 25 inches.
A # 4 bar is 1/2 of an inch or .50 of an inch x 40 bar diameters is 20 inches )
What is the diameter of a # 5 reinforcing bar?
5/8 inch (Placing Reinforcing Bars Page 7-1
Every number for the size of a reinforcing bar represents 1/8 inch)
Concrete cover is the minimum distance from the _______________.
Outside of the reinforcing bar to face of concrete (Placing Reinforcing Bars Page 11-3)
Which of the below is correct for the standard reinforcing bar sizes?
3 through # 11, # 14 and # 18 (Placing Reinforcing Bars Page 6-1 – 9th Edition
Page 7-1 10th Edition adds a # 20 bar to the list which is twelve sizes)
What type of support would be used to hold a rebar mat 3 feet off the ground?
Standee (Placing Reinforcing Bars Page 12-13)
Where are the temperature bars placed in a slab?
Right angles (Placing Reinforcing Bars 6-8)
How many different sizes are there in reinforcing bars?
11 (Placing Reinforcing Bars Page 6-1 – 9th Edition
Page 7-1 10th Edition states there are 12 sizes)
When is reinforcement not needed in concrete?
Driveways (Placing Reinforcing Bars – Unknown Location)
As a concrete beam is loaded and has the tendency to bend down, where in the beam would the reinforcing be placed to resist this tension?
Bottom (Placing Reinforcing Bars Page 6-4)
Where are temperature bars placed in a joist?
On top of all other bars with support bars underneath them parallel to joist bars (Placing Reinforcing Bars Page 13-8)
A rebar splice is 25 inches using a 40D splice, what is the size of the rebar?
5 (Placing Reinforcing Bars Page 11-18
Formula = 25 divided 40 = .625 x 8 = 5)
