Quality civil Engineer interview Question | civil Engineering

What is the setting time of concrete ? How much time to take concrete initial setting arrived? How can be know?

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.

Which type of flyash and admixture are we used in heavy construction?

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 lignite or sub-bituminous coal, may also be used depending on project specifications.
• Examples of water-reducing admixtures include lignosulfonates, polycarboxylates, and melamine-based superplasticizers.

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

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

Why silt is harmful for concrete?

Silt is harmful for concrete as it reduces its strength and durability.

• Silt particles are fine and can fill the voids in concrete, reducing its strength.
• Silt can increase the water demand of concrete, affecting its workability.
• Silt can cause segregation and bleeding in concrete, leading to poor quality.
• Silt can react with cement and other constituents, compromising the chemical reactions.
• Silt can result in a rough surface finish and reduced aesthetic appeal of concrete.

How to calculate moisture correction?

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)

Why do during of concrete?

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 improves its long-term performance.
• During of concrete can be achieved through various methods such as wet curing, curing compounds, and curing blankets.
• For example, wet curing involves keeping the concrete surface continuously moist by spraying water or covering it with wet burlap.
• Curing compounds are liquid membranes that form a protective layer on the concrete surface, preventing moisture loss.
• Curing blankets are insulating materials that retain heat and moisture, promoting proper curing in cold weather conditions.

What is RCPT tests ?

RCPT stands for Rapid Chloride Permeability Test, used to measure the permeability of concrete to chloride ions.

• RCPT is a non-destructive test used to evaluate the durability of concrete.
• It measures the rate at which chloride ions penetrate the concrete.
• The test involves applying an electrical charge to the concrete sample and measuring the current flow.
• The results of the test can be used to determine the likelihood of corrosion in the concrete.
• RCPT is commonly used in the construction industry to ensure the quality and longevity of concrete structures

Can you explain the role of QA/QC in construction projects?

Ans: Quality Assurance (QA) and Quality Control (QC) in construction are essential to ensure that the project meets specified standards and requirements. QA focuses on the processes used in construction, while QC focuses on the product’s quality. QA/QC engineers are responsible for creating and implementing quality plans, performing inspections, and ensuring compliance with codes and standards.

What are the key elements of a Quality Control Plan for a construction project?

Ans: A QC plan typically includes:

– Inspection and testing procedures

– Material Control

– Document Control

– Non-conformance reporting

– Corrective and preventive actions

– Calibration of measuring instruments

Why do grading of aggregates?

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 to separate the aggregates into different sizes.
• Grading can also be done by visual inspection or by measuring the particle size distribution.
• Overall, grading of aggregates is an important step in producing high-quality, durable concrete.

How do you ensure compliance with building codes and regulations on a construction site?

Ans: I ensure compliance by:

– Regularly reviewing local building codes and regulations

– Conducting inspections at various stages of construction

– Verifying that construction materials meet code requirements

– Collaborating with relevant authorities for inspections and approvals

What is the purpose of conducting material inspections on a construction project, and how do you perform them?

Ans: Material inspections are crucial to verify that materials meet project specifications.

I perform them by:

– Checking material certifications and test reports

– Inspecting materials for damage or defects

– Performing tests such as concrete slump tests or soil compaction tests

– Maintaining records of inspections and test results

How do you handle non-conformance or quality issues on a construction site?

Ans: When I encounter non-conformance:

– I document the issue, including details and photos.

– Notify the relevant parties, such as the contractor or project manager.

– Work with the team to develop corrective and preventive action plans.

– Verify the implementation of corrective actions.

– Ensure that the issue is resolved before proceeding with the project.

What types of testing methods are commonly used in QA/QC for civil engineering projects?

Ans: Common testing methods include:

– Concrete strength testing (compression tests)

– Soil testing (proctor compaction test, sieve analysis)

– Non-destructive testing (ultrasonic, radiographic)

– Welding inspections (visual, radiographic)

– Structural inspections (dimensional checks, load tests)

How do you stay updated with the latest industry standards and best practices in QA/QC?

Ans: I stay updated by:

– Regularly attending workshops, seminars, and training programs

– Reading industry publications and journals

– Participating in relevant professional associations

– Networking with colleagues to share knowledge and experiences

Can you provide an example of a challenging quality issue you’ve encountered on a previous project and how you resolved it?**

Ans: (Provide a specific example from your experience, highlighting your problem-solving skills and attention to detail.)

What software tools or applications are you proficient in for QA/QC tasks?

Ans: I am proficient in using software such as AutoCAD for reviewing drawings, Excel for data analysis and reporting, and specific QA/QC software like Procore or Aconex for document control and collaboration.