Concrete Alberta

Concrete Alberta Mobile Mixer Certification Auditor Qualification and Producer Orientation Program Exam

Please review all aspects of each question and select the response that best answers the question. Passing Grade = 80% (32/40)

Name *

Email *

Phone Number *

Company Name *

Location (city/town) *

INTRODUCTION / GENERAL

1. The Audit contains the following items: *

a) a checklist of loading facility requirements

b) a mobile mix concrete truck inspection checklist

c) an engineer’s & member’s conformance agreement

d) a list of documents that must be submitted annually to retain certification

e) all of the above

2. The Mobile Mixer will remain certified as long as: *

a) the owner remains a member of Concrete Alberta in good standing

b) a unit was sold and the New Owner requests a certificate

c) an audit conducted within the last 3 years is still in effect

d) The owner under whom the unit is certified has consistently submitted all the items as outlined in the Annual Documentation Submission portion of the checklist

e) the mobile mixer unit is calibrated regularly at the rate prescribed in the checklist and it’s maintained in the same condition and functioning capabilities as it was found when it was certified

f) a), c), d) and e)

3. For a professional engineer to complete the audit and checklist for the mobile mixer facility they must: *

a) be employed by a company directly involved with the cement or ready mixed concrete industry

b) be listed on Concrete Alberta’s approved auditors list

c) have acceptable insurance coverage

d) have obtained a “Certificate of Qualification” from Concrete Alberta’s Plant Certification Auditor Qualification and Producer Orientation Program

e) answers b, c, and d

4. Should you submit a partially completed mobile mix concrete production facilities certification audit checklist to Concrete Alberta? *

a) yes

b) no

5. A Mobile Mixer must be operating in order for an audit to be completed. *

a) true

b) false

6. Mobile Mix Concrete Production Facilities that fail to meet all of the criteria of the audit will have how many weeks to correct any deficiencies? *

a) 2 weeks

b) 4 weeks

c) 6 weeks

d) 36 weeks

7. Mobile mixer units that only supply concrete for residential concrete projects do not need to be inspected or certified by the third-party engineer: *

a) true

b) false

RAW MATERIALS

8. A common bag house should: *

a) shake down to the aggregate storage bin

b) shake down to the least affected cementing material silo

c) not be used unless there is no potential compromise of concrete durability

d) b and c

9. Which cementitious feed pipes should be marked and designated: *

a) the GU feed pipe

b) the HS feed pipe

c) the fly ash feed pipe

d) all cementitious feed pipes

10. All concrete aggregates must meet the requirements of: *

a) the Alberta Sand & Gravel Association (ASGA)

b) Bob’s Aggregate Pit

c) CSA specification A23.1

11. Concrete mixing water may be: *

a) domestic water supplied by local municipal authorities

b) potable well water

c) tested and approved wash water

d) clean looking, but not tested, lake, river, stream, well or slough water

e) a, b & c

12. CSA A23.1 requires bi-annual testing of all treated wash water: *

a) true

b) false

13. Concrete admixtures must be: *

a) able to meet the requirements of CSA A23.1 (ASTM C494, or C260 or C1017) at all times

b) measured and discharged separately

c) agitated unless they are a stable solution

d) stored in such a manner as to prevent damage

e) all of the above

14. Aggregate storage should be configured to: *

a) keep distinct gradings separated so they are not allowed to comingle

b) prevent contamination by fugitive dust that could lead to paste aggregate bond issues

c) facilitate safe access for sampling to validate gradations have not been compromised from transport and handling

d) safe access for inspection of bins for wear and tear that could contribute to cross contamination

e) all of the above

CALIBRATION

15. The mobile mixer unit auditor may accept the mobile mixer calibration by a qualified individual such as: *

* Note: The owner of the Mobile Mix Concrete Facilities must sign off on all calibration reports.

a) the mobile mix unit operator who has completed this program*

b) the mobile mix unit supplier who has completed this program*

c) the mobile mix unit auditor’s designate who has completed this program

d) all of the above

16. Signatures on the Calibration Report indicate that the unit meets all of Concrete Alberta Mobile Mixer Unit calibration requirements as stipulated in the audit checklist: *

a) true

b) false

17. Providing no alterations were made to the unit and the unit was not intentionally taken out of circulation from the fleet, the Mobile Mix Concrete supplier agrees to have the mobile mixer unit’s cement, aggregates, admixtures and water dispensing... *

...system calibrated at intervals not exceeding?

*Note: Unless only operated during the summer months in which case it should be calibrated before starting a new summer supply season or whenever there’s a question of accuracy i.e. field test results do not support a historically proven mix design or immediately upon repair or replacement of the mixing auger.

a) just prior to the certifying engineer’s visit (approximately three years)

b) Every six (6) months* (admixtures and water every 3 months)

c) every other year

d) every two years

18. Minimum sample size of cementing materials and aggregates to be taken when conducting a calibration is: *

a) 10 kg

b) 20 kg

c) 30 kg

d) 50 kg

19. Admixture densities must be known when conducting calibrations: *

a) true

b) false

20. The yield is deemed to be acceptable if: *

a) the concrete surface is within 3 mm of the top of the yield box when the air content is between 5% and 8% and the slump is within the specified range of the selected target (i.e.: Target + 30 mm)

b) the concrete surface is within 5 mm of the top of the yield box when the air content is between 6% and 8% and the slump is within the specified range of the selected target.

c) the concrete surface is within 10 mm of the top of the yield box when the air content is between 5% and 8% and the slump is within the specified range of the selected target.

d) it is within is within + 1.3% of the volume of the container when the air content is between 5% and 8% and the slump is within the specified range of the selected target (i.e.Target + 30 mm).

BATCHING EQUIPMENT

21. Cementing materials dispensing. Check to make sure: *

a) cement metering auger is free of build-up and provides consistent feed

b) cement discharge opening is unobstructed in any way.

c) all of the above

22. The main conveyor belt should be clean tight and free of any faults or materials residues: *

a) true

b) false

23. Aggregate bins can be loaded with aggregates of differing grades one on top of the next to provide a blended aggregate feed stream: *

a) true

b) false

24. Auger/Mixer must be free from wear and of any materials residue build-up at all times: *

a) true

b) false

25. All aggregate bins should be covered to prevent moisture variation during transport and idling time: *

a) true

b) false

26. All acceptable mobile mixers must have: *

a) charging and discharging openings and chutes in good condition and free from build up

b) the manufacturer’s “Rated Unit Capacity Plate” secured on the frame

c) unit number clearly displayed on the outside of the unit and corresponding manufacturer’s serial number on file

d) all of the above

ACCURACY OF MOBILE MIXER BATCHING

27. Discharging devices shall be capable of stopping the flow of material within the specified tolerances: *

a) true

b) false

28. Which of the following batch accuracy tolerances statements is NOT correct: *

a) cementitious material dispensed not less than the required mass and not more than 4% excess

b) water can be dispensed by volume or mass within ±1% of target amount

c) aggregate can be dispensed by volume within ±2% of target amount

d) admixtures can be dispensed by volume or mass within ±2% of target amount

29. Moisture contents of all aggregates must be calculated from representative sub samples of each bin upon charging: *

a) true

b) false

30. When conducting Within-Batch Uniformity Testing to CSA, how many samples are required: *

a) at least 2 samples, spaced a minimum of 0.5 m3 of continuous production apart

b) at least 3 samples, spaced a minimum of 0.5 m3 of continuous production apart

c) at least 3 samples, spaced a minimum of 1.0 m3 of continuous production apart

d) as many as it takes to get at least two in a row that are within tolerances

31. A mobile mixer unit’s production is deemed uniform if: *

a) the concrete mixed by the unit meets the uniformity requirements of CSA - A23.1

b) the range between the highest and lowest value of 3 slump test samples is ±30 mm

c) the range between the highest and lowest value of 3 Air content samples is ±0.8%

d) all of the above

32. If mobile mixer auger wear is excessive or the mixer design has been significantly altered the unit will be deemed satisfactory if: *

a) the concrete mixed by the unit meets the uniformity requirements of CSA - A23.1

b) the range between the highest and lowest value of 3 density samples is ±700 kg/m³

c) the range between the highest and lowest value of 3 Air content samples is ±2.5%

d) all of the above

TICKETING SYSTEM

33. Which one of the following items on a delivery ticket are not required to meet Concrete Alberta/ARMCA guidelines: *

a) extra water added and on whose authority it was added

b) the specified class or designation of concrete

c) the specified time when the truck arrived on site

d) truck number and concrete load number

e) the date and time window and volume of the concrete produced

34. Freshly mixed cement, mortar, concrete or grout may cause skin injury. Avoid contact with skin whenever possible and wash exposed skin areas promptly with water. If any cement or cement mixtures get into the eyes, rinse immediately and repeatedly... *

...with water and get prompt medical attention. Keep children away from cement powder and all freshly mixed cement products. This cautionary warning should appear in its entirety on all delivery tickets along with:

a) the SDS

b) a WHMIS Label

c) the phone number of the nearest Poison Control Centre

d) the location of the nearest eye wash station

35. Mobile Mixer concrete producers issuing delivery tickets that indicate HSE concrete was produced: *

a) must be producing this concrete using Type HS Cement

b) must be using GU cement to produce this concrete

c) must have current supporting durability test documentation to do so

d) must use a blended cement to do so

CONFORMANCE AGREEMENT & DOCUMENTATION

36. Annual Document Submissions to Concrete Alberta include which of the following: *

a) operator’s business permit and driver’s license

b) cementing material certification letters and materials test reports

c) cement, aggregate, admixture and water calibration records

d) annual aggregate compliance with CSA testing

e) admixture certification letters

f) b, c, d, and e

37. The Certifying Engineer is responsible for certifying that the Mobile Mix Concrete Production Facilities and Mixer Unit have been inspected and meet the audit requirements of conformance as of the date of inspection. The Mobile Mix Concrete... *

...Facility and Unit owner is responsible to maintain the facility and unit in accordance with the Audit and Check List requirements at all times:

a) true

b) false

38. Batching Records are optional: *

a) true

b) false

39. Batching records should: *

a) link each batch to the client, the date, production time window and mobile mixer unit from which it was batched

b) register the moisture corrected quantities of each material batched for each mix supplied

c) be secured and readily retrievable in perpetuity

d) include any dispensing adjustments made as product was produced

e) all of the above

40. Complete conformance with all requirements of the ARMCA Mobile Mix Concrete Production Facilities Certification Audit and Check List document indicates: *

a) all concrete will be within specification and/or customer requirements

b) the loading facilities, the mobile mix production unit and concrete production materials are capable of producing quality concrete when operated properly

c) the Mobile Mixer Unit will produce concrete that meets the requirements of Alberta Transportation

d) none of the above

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