Show:
Inserts
Transporting
Vibrating
Finishing and Curing
Stripping and Defects
100
This is attached to bucks to provide backing for finished frames
What are wood keys
100
After water is added to the concrete mixture it must be placed within this time.
What is 90 minutes?
100
The distance that a concrete vibrator should extend into the lower layer of concrete.
What is 150mm or 6 inches
100
Tool used to round the corners of a sidewlk slab.
What is the edger?
100
The main concern when stripping forms
What is safety?
200
This is used to locate anchor bolts very precisely
What is a template
200
If the distance from the concrete batch site to the job site is too great this may be done.
What add water on the way?
200
The result of leaving a concrete vibrator in the same spot for a long time.
What is the coarse aggregate settles to the bottom of the form or segregation
200
The two conditions for proper curing of concrete
What is moisture and cool temperature
200
Tools to be used when stripping green concrete
What is wooden wedges and levers
300
These are cast into concrete to allow flashings to be inserted later.
What is a reglet
300
Where concrete should be placed in relation to previously placed concrete.
What is against it?
300
The result of properly vibrated concrete is this.
What is voids are eliminated and surface is smoother
300
In order to attain 90% of its strength most concrete should be cured this long in the correct conditions.
What is 7 days.
300
Damage or defect that can be caused by early stripping of formwork
What is spalling
400
This is done to create a solid, level base for machinery or equipment resting on a concrete slab.
What is (form and) grout the machine to the base.
400
The primary concern when using a conveyor to move concrete is this
What is segregation
400
How to tell when adequate vibration has taken place.
What is bubbles stop coming to top or surface glistens
400
The second coat of a curing compound is put on in this manner.
What is at right angles to the first coat.
400
Two concrete defects caused by not waiting for surface water to evaporate.
What are crazing and dusting?
500
DOUBLE JEOPARDY!!!!! A joint placed between two seperately cast sections of concrete that is required to be immovable would require the use of these
What is deformed dowels or rebar
500
This method has the greatest effectiveness in lowering the temperature of the concrete mix in hot weather.
What is cooling the aggregates?
500
If concrete is used arcitectural formwork this type of vibration is most effective
What is external vibration
500
The bull float does this to the concrete
What is pushes down the large aggregates.
500
Reason that a damaged area of concrete must be wet before patching
What is so the concrete will not absorb the moisture from the patch.