Per OSHA 1926.701(b), what must be done with protruding reinforcing steel that employees could fall onto or into?
Safety
Question · Easy
OSHA fall heights, to scale
Short
Under OSHA 1926.701(d), who may ride a concrete bucket?
On a typical C-5 building project, OSHA 1926.501 requires fall protection when an employee is exposed to a fall of how many feet or more?
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When a handheld power saw is used to cut concrete, OSHA 1926.1153 Table 1 first requires which silica control?
Per OSHA 1926.703(a)(2), what formwork documents must be available at the jobsite?
Question · Medium
OSHA 1926.701(e) restricts work under elevated concrete buckets. Which statement is correct?
Unless the excavation is in stable rock and a competent person finds no cave-in hazard, OSHA 1926.652 requires a protective system in trenches starting at what depth?
A 6-foot-deep footing trench is occupied. Per OSHA 1926.651(c)(2), a ladder or other safe egress must be located so that no more than how much lateral travel is required?
OSHA 1926.702(j) requires bull-float handles to be nonconductive or insulated when they might contact which hazard?
OSHA 1926.703(e) allows removal of wall or elevated-slab forms only after which determination?
Question · Hard
Before placing a slab-on-ground, which subgrade condition is acceptable?
Concrete Earthwork
Per IBC 2018 Section 1809.4, footings shall be placed not less than how far below the undisturbed ground surface?
IBC 2018 Section 1907.1 requires a polyethylene vapor retarder under interior slabs-on-ground to be at least what thickness, with joints lapped at least how much?
What is the IBC 2018 Section 1907.1 minimum thickness of a concrete floor slab supported directly on the ground?
Under IBC 2018 Section 1805, when is foundation-wall waterproofing required instead of dampproofing?
Per OSHA 1926.651(j)(2), excavated spoil placed next to a trench shall be kept at least how far from the edge, unless a retaining device is used?
For a simple sloped trench in Type C soil, OSHA 1926 Subpart P Appendix B allows a maximum slope of which ratio (horizontal:vertical)?
IBC 2018 Section 1804.4 requires the ground next to a foundation to fall at least how much in the first 10 feet, unless an approved drain is used?
A January footing pour in northern Nevada finds the trench bottom frozen 2 inches deep. What is the correct action?
IBC 2018 Section 1907.1 excepts a slab vapor retarder in which of the following cases?
Engineered fill under a C-5 building slab is specified at 95 percent of ASTM D1557 in 8-inch maximum loose lifts. After three lifts, a loaded water truck leaves 2-inch ruts and pumping. What should the contractor do?
A continuous footing is 80 feet long, 24 inches wide, and 18 inches thick. How many cubic yards of concrete are required for the footing only, with no waste?
What is the water-cementitious materials ratio (w/cm) of a mixture?
Concrete
Which ASTM C150 portland cement is selected when high early strength is required?
Why does ACI 318-14 require air-entrained concrete for Exposure Classes F1, F2, and F3?
The ASTM C143 slump test is used on the job to measure which fresh-concrete property?
Unless an alternate 26.5.3.2 method is used, ACI 318-14 requires concrete other than high-early-strength to be kept moist and above what temperature for at least how long after placement?
ACI 318-14 Section 19.2.1.1 sets the minimum specified compressive strength of structural concrete at which value?
Why must bleed water disappear before a slab is steel-troweled?
A 40-foot by 24-foot slab is 4 inches thick. How many cubic yards of concrete are required, with no waste allowance?
A batch contains 564 lb of cement and 282 lb of mixing water, with no supplementary cementitious materials. What is the w/c ratio?
For Exposure Class C2 (reinforced concrete exposed to moisture and an external source of chlorides), ACI 318-14 Table 19.3.2.1 requires which pair of limits?
ACI 318-14 Table 19.3.2.1 limits Exposure Class F2 concrete to a maximum w/cm of 0.45 and a minimum f'c of which value?
For 3/4-inch nominal maximum aggregate, ACI 318-14 Table 19.3.3.1 requires what total air content for F2 or F3 concrete?
Per ACI 318-14 26.12.1.1, a strength test is the average strength of which specimens made from the same sample?
ACI 318-14 26.12.2.1 requires samples for strength tests of each class of concrete not less often than which frequency?
For f'c of 4000 psi, ACI 318-14 26.12.3.1 accepts the strength level if every average of three consecutive tests is at least 4000 psi and no single test falls below which value?
ACI 318-14 26.5.3.2(b) requires high-early-strength concrete to be kept moist and above 50°F for at least how long, unless an alternate curing method is used?
ACI 318-14 26.5.4 requires concrete to be protected from freezing until it has reached at least what compressive strength?
A mix is specified with a 4-inch target slump. Using the ASTM C94 tolerance for a specified slump more than 2 inches through 4 inches, what delivery range is acceptable before any permitted water addition?
ACI 318-14 26.4.1.4.1 prohibits calcium chloride or chloride-containing admixtures in which concrete?
ACI 318-14 26.4.2.1(a) limits nominal maximum aggregate size to the least of which three values?
Order concrete for a 50-foot by 30-foot by 5-inch slab plus four isolated piers that are each 2 feet by 2 feet by 3 feet. Include 10 percent waste. What is the nearest whole cubic yard to order?
A truck is batched with 564 lb of cement and 250 lb of mixing water. The specified maximum w/c is 0.50 and no cementitious substitutes are used. Using 8.34 lb/gal, how much withheld water may be added at the site without exceeding w/c?
If cylinders fail and ACI 318-14 26.12.6.1 core tests are used to judge in-place concrete with f'c = 4000 psi, the concrete is adequate when which pair of results is met?
A Las Vegas slab is placed at 2 p.m. with 95°F concrete, 15 mph wind, and a dry subgrade. The specified maximum w/cm is 0.50 and the truck has no withheld water. What is the correct response to a 2-inch slump at the chute?
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