G1 Flashcards
Plain concrete is…
Concrete without any reinforcing
Thermal expansion of concrete or steel:
Is the same in both
Cement paste bonds to
Reinforcing steel
Prestressed concrete is:
In a state of pre-compression
Pre-tensioning is:
Before concrete is placed
Which shape is not a type of concrete shell roof?
Flat roof.
What is used to reproduce the texture of forming materials?
Form lining
Concrete masonry is construction from…
Bricks or blocks
Concrete with air entrainment has:
Microscopic air bubbles.
Cement mixture applied with compressed air is called:
Shotcrete
What makes pervious concrete different from other concrete types?
It is porous
3 basic elements of concrete are:
Cement, water, aggregates
Rocklike substance produced by a kiln is called:
Clinkers
4 basic ingredients used in the manufacture of cement I known as:
Iron, silica, alumina, and limestone.
Normal Portland cement is now known as:
GU cement.
High-Early strength hydraulic cement is:
HE cement
LH cement is used for:
Low heat-of-hydration concrete
Expansive cements cause concrete to:
Expand during setting
Good aggregates should be shaped:
Round and vertical
Good aggregates should:
Be clean, hard and strong
Fine aggregates are usually considered to be:
Less than 5mm
An accelerator is an example of an:
Admixture
Masonry cement best suited for foundation construction is:
Type M
A major greenhouse gas produced by the cement industry is:
CO2
One way to reduce CO2 emissions during cement production is to:
Decrease amount of clinkers used.
The slump cone should be filled up and rodded in how many layers?
3
Proper size of a slump cone in mm?
100 x 200 x 300
To make strong durable concrete, the water-cement ratio should be:
Low
In concrete, aggregates make up what percentage?
60-80%
Except for slab on grade, the size of aggregates should be___of the thickness of the member.
1/5th
Concrete being pumped should have a ____added
Superplasticizer
Retarding ad-mixtures are used:
To slow down the setting time of concrete.
