Corrival Corporate Services Field Quality Engineer Interview Questions and Answers

Admixtures are chemicals added to concrete to enhance its properties or performance.

• Admixtures can improve workability, durability, strength, and set time of concrete.

• Examples of admixtures include water reducers, accelerators, retarders, and air-entraining agents.

Cube acceptance criteria refers to the set of standards or requirements that a cube must meet in order to be accepted or approved.

• Cube dimensions must meet specified tolerances

• Surface finish must meet specified standards

• Cube must pass specified strength or durability tests

• Cube must meet any other specified criteria for acceptance

Workability of concrete refers to its ease of mixing, placing, and compacting without segregation or bleeding.

• Workability is influenced by water content, aggregate size and shape, and admixtures.

• Concrete with high workability is easier to place and compact, while low workability may require more effort.

• Examples of tests to measure workability include slump test, flow table test, and Vebé test.

The code for UPV test is ASTM C597.

• ASTM C597 is the standard code for Ultrasonic Pulse Velocity (UPV) test.

• UPV test is commonly used in construction to assess the quality of concrete.

• The test involves sending ultrasonic pulses through the concrete and measuring the time taken for the pulses to travel through the material.

Different types of pile include friction piles, end-bearing piles, and composite piles.

• Friction piles rely on skin friction along the length of the pile for support.

• End-bearing piles transfer the load to a strong layer of soil or rock at the bottom.

• Composite piles combine different materials like concrete and steel for added strength.

• Other types include sheet piles, helical piles, and screw piles.