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None Concrete Placement Questions

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None Concrete Placement
What would you need to add if you were required to build a suspended set of concrete stairs instead of earth supported?
4. Additonal water to the mix
None Concrete Placement
None Concrete Placement
At what point are you able to start finish trowelling the concrete?
1. Once the bleed water has evaporated
2. After floating the concrete
3. Before florating the concrete
4. After the screeding is finished.
None Concrete Placement
What is a consequence of concrete curing to quickly?
1. Reduced strength
2. Reduced workability
3. Reduced longevity
4. All of the above
None Concrete Placement
None Concrete Placement
What is done to concrete to lengthen the curing time?
1. Place concrete quickly with less water
2. Add more water during concrete placement
4. Keep concrete hydrated after placing
None Concrete Placement
Concrete strength is measured in                       .
1. Pounds per inch
2. Pounds per square inch
3. Pounds per yard
4. Pounds per meter
None Concrete Placement
None Concrete Placement
In a standard concrete mix 25%-35% of the water is used for hydration of the cement. What is the purpose of the remainder of the water in the mix?
1. to control the rate of setting
2. to coat each particle of aggregate
3. maintain water cement ratio
4. to make the mix workable
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