10+ Marrina Decisions Interview Questions and Answers

Aggregate abrasion value is a measure of the resistance of aggregate to wear by abrasion.

• Aggregate abrasion value is determined by subjecting the aggregate sample to abrasion in a rotating steel drum containing a specified number of steel spheres or rods.

• The sample is then removed from the drum and sieved to determine the weight of the material passing through a specified sieve size.

• The aggregate abrasion value is calculated as the percentage loss in weight of the material co...read more

We are using concrete grade M30 for the pier, pile, and pile cap in our project.

• Concrete grade M30 is commonly used for structures like piers, piles, and pile caps due to its high strength and durability.

• It is important to use the correct concrete grade to ensure the structural integrity and longevity of the project.

• Examples of other concrete grades commonly used in construction include M20, M25, and M40.

The humidity level during the cement consistency test should be maintained at around 50-70%.

• Ideal humidity level for cement consistency test is 50-70%

• High humidity can lead to faster setting time of cement

• Low humidity can lead to longer setting time of cement

Before casting a pier, aspects such as design specifications, material quality, formwork, reinforcement, and curing process should be checked.

• Check design specifications to ensure the pier meets structural requirements

• Verify the quality of materials used for casting the pier

• Inspect the formwork to ensure it is properly constructed and aligned

• Check the reinforcement placement and spacing for adequate strength

• Ensure proper curing process is followed to prevent cracks and achiev...read more

Constructing a cast pier involves preparing the site, setting up formwork, pouring concrete, and curing the pier.

• Prepare the site by clearing the area and ensuring proper soil compaction.

• Set up formwork to shape the pier and hold the concrete in place during pouring.

• Pour concrete into the formwork, making sure it is properly mixed and compacted.

• Allow the concrete to cure and gain strength before removing the formwork.

• Inspect the pier for quality and structural integrity befor...read more

The code for concrete mix design is typically specified by the project engineer or architect based on the requirements of the project.

• The code for concrete mix design can vary depending on the project specifications and requirements.

• Common codes used for concrete mix design include ACI 211, ASTM C94, and BS 8500.

• The code will specify the required proportions of cement, aggregates, water, and admixtures for the concrete mix.

• The code may also include guidelines for testing and ...read more

Specific gravity of aggregate is the ratio of the weight of a given volume of aggregate to the weight of an equal volume of water.

• Specific gravity is a unitless value that indicates the density of a material compared to the density of water.

• It is typically measured by filling a container with a known volume of aggregate and weighing it, then dividing by the weight of an equal volume of water.

• The specific gravity of aggregate can vary depending on the type of aggregate being u...read more

IS code for RMC plant calibration is IS 4926:2003

• IS 4926:2003 is the Indian Standard code for Ready Mixed Concrete (RMC) plant calibration

• The code specifies the procedure for calibration of RMC plants to ensure quality and consistency in concrete production

• Calibration involves checking and adjusting the equipment used in the RMC plant to meet the specified requirements

Curing compounds are applied to concrete surfaces to retain moisture and promote proper curing for increased strength and durability.

• Prevent moisture loss from the concrete surface

• Promote proper curing for increased strength and durability

• Help in reducing cracks and improving surface quality

• Can be used on horizontal and vertical surfaces

• Examples: acrylic-based curing compounds, resin-based curing compounds

Step and lip are features commonly found in machined parts, with step being a change in height between two surfaces and lip being a protruding edge.

• Step refers to a change in height between two surfaces on a part.

• Lip is a protruding edge or ridge on a part.

• Steps and lips are important features to consider in quality engineering to ensure proper fit and function of parts.

• Examples: A step on a shaft where the diameter changes abruptly, a lip on a housing to prevent components f...read more

Quality of cement, aggregate, and sand is crucial for the strength and durability of concrete.

• Cement should have a consistent fineness and chemical composition.

• Aggregate should be clean, hard, and free from organic matter.

• Sand should be well-graded and free from impurities.

• Proper testing and quality control measures should be in place to ensure the quality of materials.

• The quality of these materials directly affects the strength, durability, and overall performance of concret...read more

Slump mold tolerance refers to the acceptable range of deviation in the height of concrete slumps from the specified value.

• Slump mold tolerance is typically specified in the project's quality control plan or construction specifications.

• It is important to monitor and control slump mold tolerance to ensure the concrete meets the required strength and workability.

• For example, if the specified slump for a concrete mix is 4 inches, the tolerance may be +/- 1 inch, meaning the acce...read more