substation construction - foundations Flashcards
When preparing an equipment foundation for a pour (concrete pad), frozen soil must be removed.
true
When preparing an equipment foundation for a pour (concrete pad), ? should be placed and compacted where the pad is to be poured.
crushed rock
Aluminum conduit or other aluminum products should not be encased in concrete because aluminum will ?
corrode
A ? and/or leveling scope are both used to ensure that concrete forms are placed at the correct grade.
transit
If an anchor bolt is not in the exact required location, minor welding or bending of an anchor bolt is acceptable.
false
To ensure rebar meets specifications, a person should check the ?
rebar tags for suitable identification
A ? can be used on site to ensure that the concrete being delivered meets the required consistency.
slump test
Concrete should be vibrated ?
until it becomes uniformly plastic
Upon completion of the concrete pour, recheck the ? for correct location and elevation.
anchor bolts
A tremie pipe should be used to pour concrete ?
when concrete is to be dropped vertically more than 6’
While there is still about 1/4 inch of water pooling on the concrete, the initial troweling with a wood float can be done.
false
A ? is required over freshly poured concrete to aid the curing process.
plastic sheet that acts as a vapor retarder
Foundations poured during very warm weather may require that water be sprayed on the concrete surface at 24-hour intervals during the first three days.
true
Forms are removed after concrete has set sufficiently, typically ? after a pour.
24 hours
