Concrete

Question 1

When and where do we use insulation in our slabs?

Answer 1

whenever slab is at or above frost level. where walkout conditions, area ways, low grade.

Question 2

what is the required finished thickness of the concrete floor in the basement?

Answer 2

4”

Question 3

what is a weather lip at a garage door?

Answer 3

1 1/2” drop down from the garage slab which prevents weather from entering the garage.

Question 4

what is an expansion joint, and what is its purpose?

Answer 4

material in between side walk slabs that minimize expansion cracks. the purpose of the expansion joint is to allow concrete to expand without cracking.

Question 5

how thick should the gravel base be under the concrete?

Answer 5

4”

Question 6

what is a structural slab?

Answer 6

grade beams with slab in place

Question 7

what is mean by facing concrete?

Answer 7

smoothing face of concrete

Question 8

when should exterior concrete not be poured in the winter?

Answer 8

28 degrees and when ground is frozen

Question 9

How thick should a sidewalk be?

Answer 9

4”

Question 10

what is the maximum sloe per code that we should adhere to on driveways?

Answer 10

14%

Answer 11

Edger:

used to finish edges of sidewalk

Answer 12

Trowel

used to smooth concrete surfaces. has a long flat bottom

Answer 13

Jointer

used to cut control joints

Answer 14

Bull float

aluminum tool mounted on a series of poles and used to spread and smooth freshly placed concrete.

Answer 15

Power Trowel

large flat blades used to shape and smooth concrete

Answer 16

Screed

used for striking off excess concrete from poured rough concrete surfaces

Question 17

what size of base stone material should be used on an asphalt driveway?

Answer 17

21A or crush&run

Question 18

what thickness should an asphalt driveway be?

Answer 18

3”

Question 19

what is the purpose of compacting the drive before putting down the asphalt?

Answer 19

prevent settlement and cracking

Question 20

what should the minimum slope be on a drive from the house to the curb to effectively move water?

Answer 20

2%

Question 21

should all soft ground in a driveway be covered with sub-base material?

Answer 21

Yes

Question 22

what is “curing compound”?

Answer 22

assisting concrete to harding point

Question 23

what is a control joint?

Answer 23

grooves inserted into a concrete surface to “control” cracking.

Question 24

what is it meant by “Air Entrained” concrete?

Answer 24

mixture used purposely to entrain micro-scopic air bubbles in concrete

Question 25

what is the PSI of basement concrete?

Answer 25

3000 PSI

Question 26

what is the PSI of exterior concrete?

Answer 26

3500 PSI