FINAL EXAM PREP !!!!!!!

Question 1

Reinforcing steel and concrete compatible?

Answer 1

Expands and contracts at same rate

Question 2

Concrete is strongest in what stress?

Answer 2

Compression

Question 3

Ideal temperature in curing concrete?

Answer 3

15° - 20°

Question 4

Forms cleaned and oiled?

Answer 4

Before each use and after each use

Question 5

Extra water added to concrete mix?

Answer 5

Increases slump, decreases 28 day strengt

Question 6

Microscopic air bubbles added to concrete mix?

Answer 6

“Air entrainment” = helps curing

Question 7

Compact the Sub-grade for Slab-on-grade?

Answer 7

Tamping over underground plumbing / on undisturbed soil

Question 8

Transferring concrete from trucks to forms?

Answer 8

Pump trucks = 120 mins from water adding, conveyors on large sites with site-made batches, buckets

Question 9

Best technique in placing concrete in wall forms?

Answer 9

Pump truck w elephant trunk hose - places closest to final location and NOT drop thru rebar

Question 10

Properly consolidating fresh concrete

Answer 10

150mm into previous lift, 600mm spacing of vibration, bubbles stop coming to top, glistening & greenish surface / tap with hammer on outside of forms / external vibrators for steel forms

Question 11

Concrete work term segregation

Answer 11

When aggregate gets seperated from cement paste

Question 12

External vibrators used

Answer 12

Steel forms

Question 13

Spandrel beam

Answer 13

Perimeter beam/girder - takes most load, formwork must be wider for work area/walkway

Question 14

Reshoring for a suspended-slab

Answer 14

4x4 w/ Ellis clamps - screw jacks

Question 15

Anchor bolts secured during a concrete placement

Answer 15

Template / cleat / hung from cleat

Question 16

Pour slab low and fill the rest with Liquid grout

Answer 16

Uniform contact between machine base and slab

Question 17

Anchor bolt threads protected

Answer 17

Grease or tape

Question 18

A group of anchor bolts

Answer 18

Position using template

Question 19

Metal angle iron embedded into concrete edges

Answer 19

Protect sharp edges of concrete from damage / strengthen concrete corners

Question 20

Purpose hand/bull floating

Answer 20

Depress larger aggregates from the top / awaken “sleeping” concrete

Question 21

Slab concrete placement – when to use bull float

Answer 21

After screeding/strike-off

Question 22

Cables placed in suspended-slab and stretched after concrete is placed and cured

Answer 22

Post - tensioned