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Course: Physical Characteristics of Rotary Kiln Expanded Slate Lightweight Aggregate

Once you have completed the test on this page you can submit your test for evaluation.  If you have answered at least 15 of the 20 questions correctly (75%) you will receive a certificate of completion for this course.

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1. The properties of lightweight concrete are significantly affected by the physical properties of the lightweight aggregate used.
  
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2. Lightweight aggregate concrete typically has a ______lower density than normal weight concrete.


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3. Aggregate used in structural lightweight concrete must conform to which standard?
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4. Expanded slate is expanded in a rotary kiln at temperatures in excess of:

500° F     B: 750° F     C: 1000° F     D: 2000°

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5. What material may be classified as lightweight aggregate produced by the rotary kiln method?

A: Expanded Shale    B: Expanded Clay    C: Expanded Slate    D: All the above
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6. The only source of slate currently used for rotary kiln expanded lightweight aggregate is found in the foothill region of what state?
A: North Carolina    B: South Carolina   C: Virginia  D: Georgia
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7. A rotary kiln is a long ______ that rotates on large bearings.
A: box    B: piston   C: tube    D: conveyor
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8. Lightweight concrete precast elements offer reduced transportation and placement costs. 
True    False
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9. Expanded Slate gets its reduced weight from_________.
A: the low density of the slate
B: chemical changes to the slate
C: masses of unconnected cells
D: weight watchers
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10. Coarse grade aggregates are stored in low-elevation stockpiles _______.
A: because it looks good
B: to make it easier to load
C: to reduce segregation
D: because it is required by the DOT
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11. Rotary kiln expanded slate lightweight aggregate has a saturated surface dry absorption (ASTM C 127) of_______.
A: 3%    B: 6%   C: 10%    D: 15%
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12. The absorption of expanded slate lightweight aggregate, under high pumping pressure is approximately _______.
A: 20%    B: 15%   C: 9%    D: 6%
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13. The dry loose density of expanded slate " aggregate is_______.
A: 40 lbs/f3    B: 50 lbs/f3   C: 60 lbs/f3    D: 70 lbs/f3
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14. The strength of the aggregate in concrete becomes more important as the design load approaches and exceeds ______.
A: 5,000 psi
B: the strength limits of the cement paste matrix.
C: 10,000 psi
D: the strength of the steel structure
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15. Which benefit is offered by lightweight concrete?
A: less dead load
B: better fire ratings
C: lower foundation costs
D: all the above
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16. Aggregates normally constitute  ____ of a concrete mix.
A: 20% - 30%    B: 40% - 50%   C: 60% - 70%    D: 80% - 90%
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17. The Hibernia offshore oil platform was designed with reduced density concrete:
A: for improved buoyancy
B: to make it cheaper
C: to meet codes
D: for iceberg resistance
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18. The superior stiffness of expanded lightweight slate contributes to a significantly high elastic modulus compared to expanded shale or expanded clay.
True    False
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19. Prior to the Raftsundet Bridge project, the Norwegian Public Road Department had not allowed placement of lightweight concrete by:
A: wheelbarrow    B: pumping   C: helicopter    D: ship
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20. The average 28 day compressive strength of the lightweight concrete on the Sand Key Condominium project was:
A: 2,500 psi    B: 5,000 psi   C: 8,000 psi    D: 12,230 psi

 

 

 

 

 

 

 

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