Concrete Basics
ACI stands for (Blank)
The American Concrete Institute
What's the first step before doing a take-off?
Verify Scale
This is the standard waste factor percentage added to concrete takeoffs.
5%-10%
This hand tool is used to level freshly poured concrete.
Screed
This protective gear must be worn to protect your eyes from splashes.
Safety glasses
A standard ready-mix concrete truck in the U.S. usually carries (Blank) amount of concrete.
8-10 CY/ Truck
To calculate cubic yards, you multiply length x width x depth and then divide by this number.
27
Rebar is usually estimated and priced at what unit of weight?
Pounds or Tons
A bull float is used for this purpose.
Smoothing/Leveling the surface
OSHA requires fall protection for concrete work at this height.
6 Feet
Concrete Strength is measured in this unit.
PSI (pounds per square inch)
The total cubic yards for 200 LF of grade beam, 2' wide and 2' deep. (Use Waste Factor & Round up)
33 Cubic Yards
In estimating, this percentage is often added to cover unexpected costs.
Contingency
This machine is used for finishing (large) slabs.
Riding Trowel or Power Trowel
Fresh concrete can cause this type of skin injury if proper PPE isn't worn.
Chemical Burns
The temperature at which fresh concrete is considered "Hot weather concrete" per ACI standards.
90 degrees F (32 degrees C)
If you have a 20' x 30' slab that is 6" thick, how many cubic yards are in that slab (Rounded up)
12 Cubic Yards
Labor costs for concrete are usually estimated by this measurement.
Square foot or Cubic Yard
This machine uses vibration to remove air pockets from fresh concrete.
Concrete Vibrator
Before entering a trench for footing work, OSHA requires this type of safety system to prevent cave-ins.
S.S.S. (Shoring, Shielding, or Sloping)
The reason concrete is reinforced with steel:
Concrete is strong in (Blank) stress but weak in (Blank) stress.
Concrete is strong in (Compression) stress but weak in (Tension) stress.
To convert cubic yards of concrete to 60 Ib bags, multiply by this factor.
45 bags per cubic yard
A pier is 24" in diameter and 18' deep. How many cubic Yards of concrete are needed to fill one pier? (Exact Cubic Yardage)
2.097
This finishing attachment is added to a power trowel to create a harder, denser surface on concrete slabs.
Pans
When Operating a concrete pump truck near overhead power lines, the minimum clearance required is this many feet from the lines up to 50 kv.
10 feet