G4 Flashcards
On which kind of surface should a slab on grade be placed?
Suitable bearing or compact fill
What factors affect the durability on the slab on grade?
Protection from weather, finishing, W/C ratio
What factors affect the strengths of a slab on grade
Base materials, concrete mix, and curing
What should be done to the walls or columns that pass through or beside a slab on grade
Provide isolation joint
Why is it important to compact the subgrade
Give firm, even bearing
Why are the screeds and forms oil before concrete placement
For ease cleaning
How long should slab forms remain in place after concrete placement
As long as possible
What contributes to both strength and durability of concrete
Controlling water / cement ratio contributes to both strength and durability
What could be added to concrete?
Admixtures improved durability and protection from chemicals oils or greases
What’s another term for a curb forming machine
Slip form
On most slab on grade concrete requires what to be placed on the sub base?
Polyurethane barrier, vapor barrier
