KEC International Quality Engineer Interview Questions, Process, and Tips

Mix design is the process of determining the proportions of ingredients to create a concrete mix with desired properties.

• Mix design involves selecting the appropriate materials such as cement, aggregates, and water.

• The proportions of each material are determined based on the desired strength, workability, and durability of the concrete mix.

• Testing is often conducted to ensure the mix meets specified requirements before

The required sizes of sieves for fine aggregate sieve analysis are typically 3/8", #4, #8, #16, #30, #50, #100, and pan.

• 3/8" sieve

• #4 sieve

• #8 sieve

• #16 sieve

• #30 sieve

• #50 sieve

• #100 sieve

• Pan

Characteristic strength is the strength of a material below which not more than a specified proportion of test results are expected to fall. Target mean strength is the strength that a structure is designed to achieve.

• Characteristic strength is a statistical value representing the lower tail of the strength distribution of a material.

• Target mean strength is the strength that a structure is designed to achieve based on ...read more

M25 is a mix of concrete with a compressive strength of 25 MPa. The cube strength of M25 grade concrete should be 25 MPa.

• M25 is a mix of concrete with a compressive strength of 25 MPa.

• The cube strength of M25 grade concrete should be 25 MPa.

• The mix proportion for M25 grade concrete is usually 1:1:2 (cement:sand:aggregate).

OPC cement is Ordinary Portland Cement, while PPC cement is Portland Pozzolana Cement.

• OPC is made by grinding clinker with gypsum, while PPC is made by intergrinding clinker with fly ash and gypsum.

• PPC has higher long-term strength and durability compared to OPC.

• PPC is more environmentally friendly due to the use of fly ash as a partial replacement for clinker.

• OPC is commonly used for general construction purposes, whi...read more