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INTERVIEW QUESTION FOR ROAD INSPECTOR IN SAUDI ARAMCO

AS PER SAUDI ARAMCO STANDARD (SAES Q-006 AND AASHTO)

ASPHALT

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Well oriented Questions and Answers Topic wise

Technical Questions Asked by Interviewer to a Civil Engineer in Interview

CHAPTER 3 – ASPHALT

QUE 1 – What are the minimum and maximum acceptable asphalt temperature range when arriving on-site?

ANS 1 -139 to 163-degree Centigrade (SAES Q-006 and AASHTO)

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QUE 2 – What is the minimum required compaction density of asphalt?

ANS 2 – 96 % (SAES Q-006 and AASHTO)

QUE 3 – What is the prime coat and where is it applied? What is its curing requirement for the Prime Coat?

ANS 3 –

.It is the asphalt bituminous material that is placed on the substrate prior to placement of the first asphalt mixture (the binder course). It must be allowed to cure and to soak into the capping layer (usually select fill)

B. 24 hours A good indication that the material cured is when the colors turn to pitch black. (the brownness is gone)

QUE 4 – What is a Tack Coat?

ANS 4 – It is the asphalt bituminous material which is applied on existing concrete or asphalt surface to bond new subsequent asphalt pavement to them. Tack coat is not necessary to place on new asphalt before placing the next layer of asphalt unless it is soiled (dirty).

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QUE 5 – What is the tolerance requirement of subgrade asphalt surface smoothness prior to placing asphalt?

ANS 5 – Using a 3-meter straight edge – 6mm

QUE 6 – What is the tolerance requirement of finished asphalt surface smoothness?

ANS 6 – Using a 3-meter straight edge 4mm longitudinally, 3mm laterally.

QUE 7 – What are the different types of compassion of asphalt? And the functions of each?

ANS 7 –

Tandem Steel Roller

Initial rolling of asphalt. Only 2 Passes at ½ overlap.
Final rolling to smoothen the surface and to see it that the edge of the roller is not visible in the asphalt.

B. Pneumatic Tired Roller

To attain the required compaction. (8 passes min, not less than 5 tons)

QUE 8 – What is the thickness of each layer allowed for an embankment and for subgrade?

ANS 8 –

For embankment: 30cm thick or as otherwise specified
For subgrade: Earth cut 30cm to be laid in two layers (15 + 15)
The earth fills 40cm to be laid in two layers (20 +20) if possible to attain the required 100% compaction.
Rock cut: 20 cm in one layer.

QUE 9 – What is the procedure of starting the first layer of earthwork if the total height of the embankment is less than 75cm?

ANS 9 – Grabbing and scarifying the area till 15cm and watering it. Removing any unsuitable material then compacting it.

QUE 10 – What is rutting?

ANS 10 – It is the longitudinal settlement of asphalt pavement due to heavy loads of the vehicles passing the roads.

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QUE 11 – What are the remedies to prevent or minimize rutting?

ANS 11 –

To limit or minimize loads of vehicles.
To make the gradation of aggregates coarser but conducive to the project.
To lower the asphalt content and or lower the asphalt penetration

QUE 12 – What is the purpose of MC-1 (Medium curing cutback asphalt)?

ANS 12 – To stabilize and seal the granular surface or subgrade and to promote bonding to bituminous surfaces.

QUE 13 – Minimum and maximum overlapping of asphalt in longitudinal joints?

ANS 13 – For longitudinal Joint – 15cm to 30cm

QUE 14 – Why do you overlap?

ANS 14 – To prevent cracking at the longitudinal joint.

QUE 15 – What is the max loss of stability for asphalt?

ANS 15 – 25%

QUE 16 – The hearing temperature of MC 1 and RC-2 before spraying?

ANS 16 – MC -1 should be heated to 50 -80 degrees (MC-70) and RC-2 should be heated to 65-95 degrees centigrade.

QUE 17 – Rate of application of MC -1 and RC-2?

ANS 17 MC1 is 0.65 to 1.75 liter/m2 and RC-2 is equal or less than 0.25 liter/m2

QUE 18 – Tolerance of asphalt using 4-meter straight edge?

ANS 18 –

Wearing course: 3mm perpendicular to centerline and 4mm parallel to centreline
Base course: 6mm perpendicular to centreline 6mm parallel to centreline

QUE 19 – What is the pattern of rolling asphalt pavement?

AND 19 – Start from the lowest part of the pavement, then going upward to the higher portion with an overlapping distance of half the rear wheel width.

QUE 20 – How do you cure cylinders?

ANS 20 –

Cylinder samples are cured in the laboratory, in water tank saturated with lime at 23⨥1.7 Degree C
It is also advisable to cure in the field, the same as the structure being represented.

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CIVIL ENGINEERING DIARY