A slab measures 40 ft long by 25 ft wide by 4 in thick. How many cubic yards of concrete are required (ignore waste)?
Estimating And Plan Reading
Question · Easy
Divide by twenty-seven
Short
How many cubic yards of concrete are needed for a continuous footing 80 ft long, 2 ft wide, and 12 in deep (no waste)?
A wall is 60 ft long, 8 ft high, and 8 in thick. What is the concrete volume in cubic yards (no waste)?
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How many cubic feet are in one cubic yard of concrete?
A circular column is 18 in diameter and 12 ft tall. What is the approximate concrete volume in cubic yards (use π = 3.14, no waste)?
Question · Hard
How deep before you need a trench box?
An estimator adds 10% waste to a calculated net volume of 45 cu yd. How many cubic yards should be ordered?
Question · Medium
On a structural plan, a detail callout reads "W8×8×16" for a wall footing. What do the three numbers typically represent?
A slab-on-grade is shown at elevation 100.00. The top of footing is shown at 96.50. How deep is the top of footing below the slab surface?
A drawing scale is 1/4 in = 1 ft-0 in. A wall measures 3-1/2 in on the print. What is the actual wall length?
Ready-mixed concrete is priced at $145 per cubic yard delivered. What is the material cost for ordering 62 cu yd?
A rectangular pad footing is 6 ft by 6 ft by 18 in thick. Including 5% waste, how many cubic yards should you order (round up to the nearest 0.1 cu yd)?
On a rebar schedule, the total length of #5 bars listed is 2,400 lin ft. Using 1.043 lb/ft, what is the approximate weight of #5 steel?
What does a plan note "TYP" next to a detail callout usually mean?
A sidewalk is 120 ft long, 5 ft wide, and 4 in thick. At $12.50 per square foot installed, what is the installed cost of the sidewalk (area-based price, ignore edges)?
Theoretical yield of a concrete mix is 27.0 cu ft per batch. After field adjustment for moisture, actual yield is 26.2 cu ft. Relative yield is closest to:
A section view shows a 10 in thick basement wall with 2 in of rigid insulation on the outside face. What is the total form-to-form thickness for the concrete wall itself?
Four identical grade beams each measure 30 ft long, 16 in wide, and 24 in deep. What is the total concrete volume for all four beams (no waste)?
What is the primary purpose of batter boards on a building layout?
Layout And Excavation
When laying out a rectangular foundation, the diagonal measurements of the rectangle should be:
Using the 3-4-5 method, a right angle is established when the sides of a triangle measure 6 ft, 8 ft, and what hypotenuse?
For OSHA sloping of Type C soil in a trench excavation, the maximum allowable slope (horizontal:vertical) is generally:
What is the primary reason to compact the subgrade under a slab-on-grade before placing concrete?
A footing excavation is overcut 6 in deeper than plan grade. The preferred corrective action before placing concrete is usually to:
Before placing concrete against earth, the excavation bottom should be:
Finish grade is elevation 212.40. The bottom of footing is elevation 208.90. What is the excavation depth from finish grade to bottom of footing?
What is a key purpose of a vapor retarder under an interior concrete slab-on-grade when specified?
When excavating near existing underground utilities, the safest first step is to:
A trench for a continuous footing is 100 ft long, 3 ft wide, and 4 ft deep. What is the excavation volume in cubic yards (bank measure, no swell)?
Bench marks used for construction layout should be:
For a foundation wall pour, the "working point" or building corner stake has been removed by the excavator. The correct response is to:
What is the main purpose of a keyway cast in the top of a footing?
When setting forms for a continuous footing, the top of form elevation should be checked against:
Spoil piles from a trench excavation should generally be kept at least how far from the edge of the excavation unless designed otherwise?
A laser level is set up and reads 4.25 ft on a grade rod at a benchmark of elevation 100.00. What elevation is indicated when the rod later reads 6.75 ft?
Why is a mud mat (lean concrete leveling course) sometimes placed on the bottom of a footing excavation?
For accurate building layout on a large site, the preferred primary control method is:
When excavating for a basement, what is a primary reason to provide a working space outside the foundation wall line?
Lateral pressure on formwork from fresh concrete is primarily a function of:
Formwork
If fresh normalweight concrete is treated as a fluid with unit weight 150 pcf, the approximate lateral pressure at a depth of 4 ft (full liquid head) is:
Why does a high rate of rise (fast wall pour) often increase the lateral pressure formwork must resist?
Formwork for elevated slabs and walls must be designed and inspected by:
What is the primary function of form ties in wall forms?
Shores supporting elevated formwork should rest on:
Release agents (form oil) are applied to form faces primarily to:
When is the safest time to strip wall forms for a non-load-bearing architectural surface, assuming the design and specifications allow it?
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