This article is about Question and Answers asked in CBT exam of Aramco and at international projects for jobs of civil quality control engineers.
Aramco Civil QC Inspector Question and Answers
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Can you explain what an Inspection & Test Plan is?
An Inspection & Test Plan (ITP) is an essential component of the quality plan. It serves as a guide to ensure quality in specific types of work, outlining the quality control activities that need to be performed in a particular order.
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Can you explain what a Quality Control Procedure is?
A Quality Control Procedure is a document outlining the specific steps required to complete the quality control activities listed in the Inspection & Test Plan (ITP).
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Can you define what a Quality Control Form is?
A Quality Control Form is a written document that details a specific activity outlined in the Inspection & Test Plan (ITP) and Quality Control Procedure. It’s used to document the fulfillment of the QC requirements.
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What references can be found in an Inspection & Test Plan (ITP)?
In an Inspection & Test Plan, you can find references to standard procedures, codes, and specification documents that guide the quality control process.
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Can you explain what a Specification is?
A Specification is a set of guidelines designed to ensure that minimum quality standards are met. It provides detailed instructions and requirements to maintain quality in a product or a service.
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What are the four types of inspection action points found in the ITP?
The four types of inspection action points in the ITP are Hold, Witness, Surveillance, and Review.
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What is the minimum design compressive strength required for structural concrete after 28 days of curing?
The minimum design compressive strength for structural concrete at 28 days curing is 4000 psi.
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What is the maximum time allowed between calibrations of instruments, gauges, and test equipment?
Instruments, gauges, and test equipment should not exceed 6 months between calibrations.
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What is the required minimum base width of a trench on either side of the pipeline?
The required minimum base of the trench on either side of the pipeline is 300mm.
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The asphalt surface regularity and thickness of the stabilized layer should not show any deviation in excess of how many mm when tested with a 3m straight edge?
The deviation should not be in excess of 6mm.
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In which scenario is compaction by water jetting or flooding permitted?
Compaction by water jetting or flooding is only permitted if the fill material is cohesionless, freely draining sand.
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What is the required compaction test in percent for base course materials and sub-base materials?
The required compaction test should be between 95% to 100%.
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What is the minimum required time for a moisture test when the concrete is ready for coating?
The minimum required time for a moisture test is 16 hours.
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What should be the temperature of the grout on site?
The required temperature of grout on site is 23°C ± 3°C.
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For pipelines, what is the maximum allowable unsupported length before backfilling?
The maximum allowable unsupported length is 3 meters.
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What is the setting time of concrete after the introduction of the mixing water to the cement and aggregates?
The setting time of concrete is 90 minutes or 1 ½ hours.
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What is the required asphalt temperature on site?
The required asphalt temperature on site is between 139°C to 163°C.
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What is the tolerance in asphalt thickness?
The measurement of any core should not be deficient by more than 10mm or 15%, whichever is less, of the design thickness.
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What is the maximum allowable total dissolved solids in water used for curing in concrete?
The maximum allowable total dissolved solids are 1000 parts per million.
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For how long should water curing continue?
Water curing should continue until the compressive strength has reached 70% of the specified strength, but no less than 7 days after placement.
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How thick should the clean sand be around the pipe to avoid damaging the coating?
The pipe should be embedded in an annulus of clean sand not less than 300 mm thick.
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What is the maximum allowable delivery temperature of concrete?
The maximum allowable delivery temperature of concrete is 35°C.
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What is the minimum required number of concrete test cylinders for strength tests?
For grouting, six (6) test cubes are required. For concrete cylinders, four (4) pieces are required: 1 for 3 days, 1 for 7 days, and 2 for 28 days.
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How can you verify whether the ready-mixed concrete is Type 1 or Type V?
Type 1 concrete contains microsilica, whereas Type V concrete is without microsilica.
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What is the allowable clear distance of the anchor bolts from the edge of the foundation?
The allowable clear distance is 100mm.
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What does W1 mean?
W1 refers to 100% witness inspection/test.
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What does W2 mean?
W2 refers to a sample witness inspection/test.
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What does H1 mean?
H1 means 100% hold point for QC inspection or test.
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What does H2 mean?
H2 refers to a sample hold point for QC inspection or test.
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What does R1 mean?
R1 means 100% review of the document.
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What does R2 mean?
R2 refers to a sample review of the document.
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What does RH1 mean?
RH1 refers to 100% review and approval of the document.
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What does RH2 mean?
RH2 refers to sample review and approval of the document.
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What is the height of the spacer in bottom concrete?
The height of the spacer is 75mm.
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What is the stress/force in the bottom in a bearing plate?
The stress/force is 5000 PSI.
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What is the minimum thickness of grout at the bottom of the bearing plate?
The minimum thickness of the grout is 25mm.
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