Standard Practice for Shotcrete – 8 PDH 

(rev Apr 2013)

 Course source material: US Army Corps of Engineers Engineer Manual 1110-2-2005, Standard Practice for Shotcrete. 

Available at: US Army Corps of Engineers – Standard Practice for Shotcrete (2MB)

 8 PDH credits awarded upon successful completion (21 correct answers) of the quiz below.  Answer with the MOST correct choice. For proof of successful completion copy and paste the answer sheet, including contact information, at the end of the quiz with your answers into an email and send it to: jbleeak@gmail.com.

 Prepared by Joe Leeak, P.E.

 Regular online price: $80.00

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Standard Practice for Shotcrete PDH Quiz

1. Documents often resulting from the use of shotcrete on a project include: [1-6]

a. Shotcrete investigation report

b. Technical Specifications

c. Engineering considerations and instructions for field personnel

d. All of the above

e. None of the above

2. Advantages of shotcrete include: [2-1]

a. Cost and convenience

b. Can be applied by semi-skilled labor

c. Can be used when cost of formwork is prohibitive

d. ‘a’ and ‘c’ above

e. None of the above

3. Shotcrete can be applied by using either a dry-mix or wet mix process. [2-3]

a. True

b. False

4. The use of air-entraining admixtures in shotcrete is only practical in dry-mix shotcrete. [2.3]

a. True

b. False

5. In combination with fibers to control shrinkage, silica-fume shotcrete has been widely used in: [2-5]

a. Tunnel construction

b. Parking lots

c. Shopping malls

d. Railroad ties

e. None of the above

6. Shotcrete with pozzolan may exhibit improved long-term strength performance and lower permeability. [3-1]

a. True

b. False

7. What special requirements should be applied to shotcrete curing water. [3-3]

a. It should be filtered

b. None

c. Chlorination

d. Recycled storm water

e. Use rainwater only

8. Water reducing and retarding admixtures are required for dry-mix shotcrete. [3-4]

a. True

b. False

9. Shotcrete cannot produce strengths equivalent to conventional concrete. [3-8]

a. True

b. False

10. What compressor capacity is required to deliver 4 CY of shotcrete per hour? [Table 4-1]

a. 365 Cubic Ft/min

b. 425

c. 450

d. 500

e. 550

11. The quality of shotcrete depends mostly on having an experience foreman rather than an experienced crew. [4-6]

a. True

b. False

12. ACI has an ongoing Shotcrete Forman Certification Program. [5-2]

a. True

b. False

13. The typical way to evaluate the shotcrete process is with: [5-4]

a. Test cylinders

b. Test cubes

c. Test panels

d. All of the above

e. None of the above

14. It is acceptable to place shotcrete against surfaces that are frozen or where there is free water. [6-1]

a. True

b. False

15. Jobsite mixing of shotcrete should not be for less than: [6-2]

a. 30 seconds.

b. 90 seconds.

c. 1 minute

d. 2 minutes

e. None of the above

16. The entrapment of rebound results in a decrease in the ultimate strength and durability of the shotcrete. [6-3]

a. True

b. False

17. Due to the difficulty of placing shotcrete around waterstops they should not be used in shotcrete applications. [6-3]

a. True

b. False

18. What percentage of rebound, by mass, can be expected when completing a wet-mix shotcrete application for a vertical wall. [6-4]

a. less than 1%

b. less than 2%

c. Less than 5%

d. More than 10%

e. None of the above

19. Proper curing of shotcrete is extremely important to ensure: [6-6]

a. Proper hydration

b. Matrix and bond strength development

c. To prevent cracking

d. To prevent drying shrinkage

e. All of the above

20. Silica-fume shotecrete must always be moist cured.[6-6]

a. True

b. False

21. Surface defects must be: [6-7]

a. Filled with latex sealant

b. Reported to the engineer

c. Repaired as soon as possible

d. Not repaired until shotcrete expansion is complete

e. None of the above

22. Where surface crazing, shrinkage cracks, or low strengths occur additional analysis is required to determine the effect on the structure.[6-7]

a. True

b. False

23. A shotcrete specification should include submittals for the following items:[7-2]

a. Cententitious materials, aggregate, admixtures, fibers and reinforcement

b. Mix proportions, nozzleman certification, equipment, curing processes

c. Test panel fabrication, testing, and evaluation

d. All of the above

e. None of the above

24. Specimens should only be cored and not sawn from the test panel. [7-2]

a. True

b. False

25. Shotcrete specifications should state: [7-3]

a. Minimum frequency of testing

b. Procedures for reporting results

c. Hourly rates for the nozzleman

d. None of the above

e. ‘a’ and ‘b’ above

26. A test panel should be completed at least: [7-3]

a. Once a week

b. Once a day.

c. Once per shift.

d. At the beginning and end of each project

e. During certification only.

27. When a material or product fails to meet the contract requirements corrective actions as specified should be initiated immediately. [7-4]

a. True

b. False

28. The quality of the materials used in the production of shotcrete and in-place shotcrete: [8-1]

a. Are established during the design stage of the project

b. Are established on the job site

c. Are established by the contractor

d. All of the above

e. None of the above

29. Test panels shot to verify the proposed mixture performance should be visually examined by QA personnel to confirm uniformity of the shotcrete. [8-2]

a. True

b. False

30. Once it is determined that the contractor is able to produce and apply shotcrete that meets the project specifications further monitoring is an unnecessary expense– because in a free market system no contractor would want to be associated with an inferior product. [8-3]

a. True

b. False

 8 PDH credits awarded upon successful completion (21 correct answers) of the quiz above. Answer with the MOST correct choice. For proof of successful completion copy and paste the answer sheet below with your answers, including contact information, into an email and send it to: jbleeak@gmail.com. 

QUIZ ANSWER SHEET

Standard Practice for Shotcrete – 8 PDH

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