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10+ Lacozy Interview Questions and Answers

Updated 7 Mar 2025

Q1. What is standard deviation for M30 grade concrete as IS 456.2000

Ans.

The standard deviation for M30 grade concrete as per IS 456.2000 is not provided.

  • The IS 456.2000 code does not specify the standard deviation for M30 grade concrete.

  • Standard deviation values for concrete grades are typically provided in specific codes or standards.

  • To determine the standard deviation for M30 grade concrete, one would need to refer to a relevant code or conduct testing.

  • Without the specific data or code reference, it is not possible to provide an exact standard ...read more

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Q2. If we are lapping two different dia bars then lap length shall be according to lower or higher dia ?

Ans.

The lap length should be according to the higher diameter of the two bars.

  • The lap length is determined by the larger diameter bar to ensure sufficient overlap and bond strength.

  • This is because the larger diameter bar requires a longer length to achieve the same level of bond as the smaller diameter bar.

  • Using the lap length of the larger diameter bar ensures that the connection between the two bars is strong and meets the required standards.

  • For example, if we are lapping a 12m...read more

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Q3. Can we do the welding to reinforcement bars ?

Ans.

Yes, welding can be done to reinforcement bars.

  • Welding reinforcement bars is a common practice in construction projects.

  • It helps to create strong and durable connections between bars.

  • Welding is often used to join reinforcement bars in concrete structures.

  • Proper welding techniques and procedures should be followed to ensure quality and safety.

  • Examples of welding methods for reinforcement bars include shielded metal arc welding (SMAW) and gas metal arc welding (GMAW).

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Q4. What is tolerance for cover to reinforcement ?

Ans.

The tolerance for cover to reinforcement refers to the acceptable variation in the distance between the surface of concrete and the reinforcement bars.

  • The tolerance for cover to reinforcement is specified in construction codes and standards.

  • It is important to maintain the specified cover to ensure the durability and strength of the reinforced concrete structure.

  • The tolerance may vary depending on the type of structure, exposure conditions, and design requirements.

  • For example,...read more

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Q5. %age of fly ash in concrete is allowed by IS 456.2000

Ans.

The percentage of fly ash allowed in concrete according to IS 456.2000.

  • IS 456.2000 allows a maximum of 35% fly ash in concrete.

  • Fly ash is a byproduct of coal combustion and is used as a supplementary cementitious material in concrete.

  • The use of fly ash in concrete improves workability, durability, and reduces the heat of hydration.

  • Fly ash can replace a portion of cement in concrete mixtures, reducing the environmental impact.

  • The specific percentage of fly ash allowed may vary...read more

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Q6. Yes. If reinforcement have carbon content equal or less than 0.25%.

Ans.

The carbon content of reinforcement should be equal to or less than 0.25%.

  • Reinforcement with carbon content exceeding 0.25% may not meet quality standards.

  • Carbon content in reinforcement affects its strength and durability.

  • Examples of reinforcement with low carbon content include low carbon steel bars and fibers.

  • Testing methods such as carbon analysis can be used to determine the carbon content of reinforcement.

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Q7. Non destructive tests of concrete structures ?

Ans.

Non destructive tests are used to assess the quality and integrity of concrete structures without causing damage.

  • Ultrasonic testing: Uses high-frequency sound waves to detect flaws or measure the thickness of concrete.

  • Ground penetrating radar: Uses electromagnetic waves to create images of subsurface structures and detect voids or anomalies.

  • Impact echo testing: Measures the resonance of a structure by striking it with a hammer and analyzing the resulting sound waves.

  • Rebound h...read more

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Q8. H/4 from top and bottom of column.

Ans.

H/4 from top and bottom of column refers to the height of the column divided by 4.

  • H/4 from top and bottom of column is a measurement used in construction and engineering.

  • It is used to determine the distance from the top and bottom of a column where certain actions or inspections need to take place.

  • For example, if a column is 12 feet tall, H/4 from top and bottom would be 3 feet from the top and 3 feet from the bottom.

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Q9. NO LAP ZONE in column ?

Ans.

NO LAP ZONE in column refers to a specific area where lap joints are not allowed in the construction of a column.

  • A lap joint is a type of connection where two pieces of material overlap and are joined together.

  • In column construction, lap joints are typically avoided in certain zones to ensure structural integrity.

  • This may be due to factors such as high stress concentration, reduced load-bearing capacity, or increased risk of failure.

  • Instead of lap joints, alternative methods ...read more

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Q10. 4 N/mm2 as per IS 456.2000

Ans.

4 N/mm2 is the compressive strength of concrete as per IS 456.2000.

  • IS 456.2000 is the Indian standard code for the design and construction of reinforced concrete structures.

  • N/mm2 is the unit of measurement for compressive strength of concrete.

  • Compressive strength refers to the ability of concrete to withstand compression or crushing forces.

  • 4 N/mm2 is a common value used for design purposes in many construction projects.

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Q11. Concrete casting manpower requirement

Ans.

The manpower requirement for concrete casting depends on various factors such as project size, complexity, and timeline.

  • Manpower requirement for concrete casting is determined by the volume of concrete to be cast.

  • The complexity of the concrete structure also affects the manpower requirement.

  • The timeline of the project plays a crucial role in determining the number of workers needed.

  • Additional factors like the availability of equipment, site conditions, and safety requirements...read more

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Q12. One pour area concrete quantity

Ans.

The quantity of concrete required for one pour area.

  • Calculate the volume of the pour area by multiplying the length, width, and depth of the area.

  • Convert the volume to cubic meters or cubic feet depending on the unit of measurement used.

  • Consider adding a wastage factor to account for any material loss during the pouring process.

  • Consult the concrete supplier or use a concrete calculator to determine the exact quantity needed.

  • Example: A pour area with dimensions 5m x 3m x 0.15m...read more

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Q13. Project one pour steel quantity

Ans.

The project requires determining the quantity of steel needed for the first pour.

  • Calculate the volume of concrete required for the first pour.

  • Determine the reinforcement ratio for the concrete.

  • Multiply the volume of concrete by the reinforcement ratio to get the steel quantity.

  • Consider any additional factors such as wastage or safety margins.

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Q14. Plot area sqm2 or sqft.

Ans.

The question asks for the measurement unit of the plot area.

  • The question is asking whether the plot area should be measured in square meters or square feet.

  • The answer should specify the preferred unit of measurement for the plot area.

  • Examples of possible answers: 'sqm2' for square meters or 'sqft' for square feet.

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Q15. Cube tank temperature

Ans.

The cube tank temperature refers to the temperature inside a cube-shaped tank.

  • Cube tank temperature is the temperature inside a cube-shaped tank.

  • It is important to monitor the temperature in cube tanks to ensure optimal conditions for the contents.

  • The temperature can be controlled through various means such as heating or cooling systems.

  • Examples of cube tanks include water storage tanks, fermentation tanks, and chemical storage tanks.

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