Table of Contents
1. Details of the PDF
| Topic | Quality Control Engineer Interview Question |
| Size | 72 KB |
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2. Quality Control Engineer Interview Question
1. What are the essential elements of Concrete placement?
⇒ The maximum height of the concrete drop is less than or equal to 1.5 meters.
Segregation must be prevented by ensuring the transit mixture is approved, has an operating revolution counter, not adding water after batching, and concrete is placed in such a manner to prevent segregation (only shovels can be used to move concrete around inside the forms no raking allowed.
Vibrators should not be used for that purpose.
2. How will trucks be checked on-site when receiving concrete?
⇒ Here are the ways to check trucks on site:
A. Revolution Counter
B. Ticket Checked for Concrete Batching time and Slump Value at the plant.
C. Slump Test.
D. Temperature Test (32 C maximum @ Site).
E. Assure Lab Technician is present at the site and performs testing.
F. 6 Cubes or 4 Cylinders should be taken per 50cum or recommended in the project specification.
3. What are allowable slumps?
⇒ In the case of a dry sample, the slump will be in the range of 25-50 mm. But in the case of wet concrete, the slump may vary from 150-175 mm.
So the value of slump is specifically mentioned along the mix design and thus it should be checked as per the local location.
Recommended slumps:
Reinforced foundation walls and footings:
a. Maximum Slump 75mm
b. Minimum Slump 25mm
Plain footings, caissons, and substructure walls:
a. Maximum Slump 75mm
b. Minimum Slump 25mm
Beams and reinforced walls:
a. Maximum Slump 100mm
b. Minimum Slump 25mm
Building columns:
a. Maximum Slump 100mm
b. Minimum Slump 25mm
Pavements and slabs:
a. Maximum Slump 75mm
b. Minimum Slump 25 mm
Mass Concrete Mix:
a. Maximum Slump 75mm
b. Minimum Slump 25mm
4. What is a plasticizer?
⇒ Usually applied at a low water-cement ratio concrete to make it workable. What is the maximum temperature of concrete that can be poured into a concrete structure? 32 Degrees C. Min and Max atmospheric (ambient) temperature before paving? Min is 5 Degrees C in cold weather and 45 degrees C max for hot weather.
5. Types of Curing?
⇒ Here the types of curing as follows:
Water Curing – as in ponding, spraying, wet sand, and wet earth
Membrane Curing – as in plastic film, liquid membrane curing compound, and reinforced paper Steam Curing.
6. When will you apply the curing of the concrete?
⇒ After the concrete has initially set (35 to 40 minutes is the initial setting time of concrete)
7. How many times do you apply the curing membrane?
⇒ At least two times. The second application is perpendicular to the first and applied after the first application has been set.
8. Within how many hours should the concrete mix be discharged after leaving the batching plant or after all the aggregates, cement, and water are in the mixer?
⇒ Within one hour if the mixer is agitated (Also depends on the design mix) And Within 30 minutes if the mixer is non-agitated.
9. What is the mixing time of a stationary or central batching plant (concrete)?
⇒ 50 to 90 seconds
10. What is the agitating speed of the mixer?
⇒ 2 to 6 revolutions per minute (RPM)
This was for the Quality Control Engineer Interview Question.
Read Also: MCQs of Concrete Technology
