Chapter 3 Flashcards
(40 cards)
Adding water to an already workable concrete batch will decrease the concrete’s
Strength
Wooden forms, unless oiled or otherwise treated, should be moistened before placing concrete to _______?
Prevent forms absorbing water from concrete and to prevent swelling.
Cracks, settlement and structural failure of a slab are often the results of ________?
Poorly prepared and compacted subgrade
When the concrete surface starts to show signs of crazing and dusting, it is a result of __________?
Working the surface to long
What is down lighting?
Spot Lights
What is backlighting
Flood Lights
What is spot lighting
Spot Lights
What is floodlighting
Flood Lights
Begin by marking the location of the center of the hole by excavating a 6” deep cone shaped centering hole with what type of equipment?
Round nose shovel
What should you use to dig a narrow slit trench?
Trenching Shovel
Hand tamping requires pounding the fill area repeatedly using a hand tamping plate or the end as a 4x4. Mechanical tamping can be accomplished using a what?
Vibrator plate compactor
Large compaction jobs can be accomplished using what?
Steam Roller
What equipment is used on areas such as lawns and roadways?
Static and vibrating rollers
What marking is used on a contour map to show importance?
Arrow
What is the maximum allowable slope for an area in which grass is to be planted?
33%
What does the hardiness rating mean?
It determines if the tree will survive the winter
When installing a sprinkler system on a slope having excessive run-off, the problem can be lessened by using?
Stream spray, high volume nozzles
The proper method of mounting sprinkler heads on a steep slope is to place them_________?
At right angle to the slope.
The precipitation rate of a sprinkler system is ________?
Inches per hour
Trees planted in wells surrounded by pavement ___________?
Can be flooded by a sprinkler head called a “Bubbler”
When is the best time to nighttime watering?
Just before dawn
Plumbing codes in many municipalities across the country require __________?
A double check valve assembly
The hose connection vacuum breaker has a?
Check valve that prevents reverse water flow.
Devices used to keep water from flowing back into the potable water supply are called _______?
Backflow Preventers
