10+ Civil Quality Engineer Interview Questions and Answers

Setting time of concrete refers to the time it takes for the concrete to harden and gain strength.

• Setting time is influenced by factors like temperature, water-cement ratio, and type of cement used.

• Initial setting time is typically around 30 minutes to 1.5 hours.

• Setting time can be determined using various methods such as the Vicat apparatus or penetration resistance tests.

Fly ash and admixtures commonly used in heavy construction include Class F fly ash and water-reducing admixtures.

• Class F fly ash, which is produced from burning anthracite or bituminous coal, is commonly used in heavy construction.

• Water-reducing admixtures, such as plasticizers or superplasticizers, are often added to concrete mixes in heavy construction to improve workability and reduce water content.

• Other types of fly ash, such as Class C fly ash produced from burning ligni...read more

Quality assurance focuses on preventing defects, while quality control focuses on identifying and correcting defects.

• Quality assurance is a proactive process that involves establishing standards and procedures to prevent defects.

• Quality control is a reactive process that involves inspecting and testing products to identify and correct defects.

• Quality assurance is concerned with the overall process and system, while quality control is concerned with the individual products or ...read more

If aggregate failed in Petrography test, what are the steps to be adopted?

• Identify the cause of failure

• Check if the sample was representative

• Re-test the sample to confirm the failure

• Notify the supplier and request for replacement

• Investigate the quality control measures of the supplier

• Consider alternative sources of aggregate

Moisture correction is calculated by adjusting the measured moisture content of a material to a standard moisture content.

• Determine the measured moisture content of the material

• Determine the standard moisture content for the material

• Calculate the moisture correction factor using the formula: MCf = (SMC - MMC) / MMC

• Apply the moisture correction factor to adjust the measured moisture content: Corrected MC = Measured MC * (1 + MCf)

During of concrete is done to ensure proper curing and strength development.

• During of concrete refers to the process of maintaining the moisture and temperature conditions for the concrete to cure properly.

• Proper curing is essential for the hydration process of cement, which leads to the development of strength and durability in concrete.

• During of concrete helps to prevent cracking, shrinkage, and surface defects.

• It allows the concrete to reach its full potential strength and...read more

The w/c ratio for moderate condition for concrete mix is typically between 0.45 to 0.55.

• The w/c ratio determines the strength and workability of the concrete mix.

• Moderate conditions refer to average temperature and humidity levels.

• A w/c ratio of 0.45 to 0.55 is suitable for most construction projects.

• Higher w/c ratios can result in weaker and more porous concrete.

• Lower w/c ratios can make the mix difficult to work with and may lead to cracking.

Grading of aggregates is important for ensuring the quality and strength of concrete.

• Grading helps to ensure that the aggregates are evenly distributed in the concrete mix.

• It helps to reduce the amount of cement needed for a given strength of concrete.

• Proper grading can improve the workability and finishability of the concrete.

• It can also help to reduce the risk of cracking and shrinkage in the finished product.

• Examples of grading methods include the use of sieves or screens ...read more

IS codes are standards set by the Bureau of Indian Standards for various material testing. Snagging and Desnagging refer to the process of identifying and rectifying defects in a building. Slump is a measure of the consistency of concrete. Rolling margin is the allowable deviation in dimensions during construction.

• IS codes are standards set by the Bureau of Indian Standards for various material testing, such as IS 456 for concrete and IS 1786 for reinforcement steel.

• Reinforce...read more

Quality assurance and quality control are two important aspects of ensuring the quality of a product or service.

• Quality assurance involves the process of planning, implementing, and monitoring activities to ensure that the product or service meets the desired quality standards.

• Quality control involves the process of inspecting and testing the product or service to ensure that it meets the desired quality standards.

• Quality assurance is a proactive approach, while quality contr...read more

Sand is a naturally occurring granular material composed of finely divided rock and mineral particles.

• Sand is formed by the erosion of rocks, minerals, and organic materials.

• It is commonly found on beaches, deserts, riverbeds, and in construction materials.

• The size of sand particles can range from 0.063 mm to 2 mm.

• Sand is used in various industries such as construction, glass manufacturing, and electronics.

• Different types of sand include beach sand, desert sand, and river san...read more

ASTM standard for Block works is ASTM C90.

• ASTM C90 is the standard specification for loadbearing concrete masonry units.

• It covers hollow and solid loadbearing concrete masonry units made from portland cement, water, and aggregates.

• The standard specifies the compressive strength, absorption, dimensions, and tolerances for concrete blocks.

• ASTM C90 also includes requirements for moisture content, density, and surface finish of the blocks.

Tolerance of cement variation in ready mix concrete (rmc) is crucial for ensuring quality and strength of the final product.

• Tolerance for cement variation in rmc typically ranges from +/- 5% to +/- 10% of the specified mix design.

• Exceeding the allowable tolerance can lead to issues such as reduced strength, durability, and workability of the concrete.

• Regular testing and monitoring of cement variations in rmc batches is essential to maintain quality standards.

• Adjustments to th...read more

Standard grout strength in PSI is typically around 2,000 to 5,000 PSI.

• Standard grout strength is usually between 2,000 to 5,000 PSI

• Higher strength grouts can have strengths up to 10,000 PSI or more

• Grout strength can vary depending on the mix design and curing conditions