60 csengineermag.com august 2019
1. Bendable concrete uses fibers to improve:
a) Color
b) Ductility
c) Flowability
d) Slump
2. The primary benefit of concrete made with titanium
dioxide cement is:
a) Increased strength
b) Improved flowabilty
c) Staying clean
d) High early strength
3. Steel fibers have been used in concrete to:
a) Improve color uniformity
b) Replace steel reinforcing bars
c) Increase set times
d) Improve surface appearance
4. In addition to increased ductility, bendable con-
crete also has the benefit of:
a) Staying clean
b) Resisting extremely high temperatures
c) Reduces surface friction
d) Self-healing
5. Graphene concrete is made by:
a) Suspending flakes of graphene in mixing water
b) Wrapping concrete with graphene sheets
c) Recycling pencil lead into concrete
d) Using graphite cement
6. Carbon dioxide is absorbed by concrete in a pro-
cess called:
a) Hydration
b) Carbonation
c) Calcination
d) Photocatalysis
7. Carbonation of concrete is higher when:
a) Surface-to-volume ratio is higher
b) Surfaces are painted
c) Concrete is buried
d) Concrete is more dense
8. Carbon dioxide injection reduced carbon footprint
of concrete in two ways:
a) Reduces strength and increase cement demand
b) Sequesters CO
2
and increases strength
c) Eliminates the need for portland cement and
increases need for water
d) Reduces labor and set times
9. One company makes artificial limestone by:
a) Crushing see shells under high pressure
b) Growing and harvesting coral
c) Mining coal ash from landfills
d) Combining CO
2
with metal oxides
10. Self-consolidating concrete (SCC) is often used to:
a) Eliminate mechanical vibration
b) Reduce on-site labor
c) Improve surface appearance
d) All the above
11. Which of the following has NOT been commercial-
ized to any great degree?
a) SCC
b) SCMs
c) Geopolymer concrete
d) Fiber reinforced concrete
12. Beneficiation of fly ash involves:
a) Recovering and processing fly ash from landfills
b) Creating fly ash bricks
c) Spreading fly ash on the surface of concrete
d) Converting fly ash to portland cement
Click Here to Take the Quiz!
Concrete Innovations Quiz
