Podcast
Questions and Answers
What is the primary objective of mixing the cement samples at the laboratory?
What is the primary objective of mixing the cement samples at the laboratory?
- To achieve the greatest possible blending and uniformity in the material (correct)
- To produce full compaction of the concrete with segregation
- To ensure the loss of water or other materials
- To determine the quantities of cement, aggregate, and water for each batch
Why is it necessary to store the test specimens in a place free from vibration?
Why is it necessary to store the test specimens in a place free from vibration?
- To maintain the specified temperature and humidity
- To prevent segregation of the concrete (correct)
- To ensure the test specimens are not exposed to air
- To prevent excessive laitance formation
What is the purpose of curing the test specimens in water after 24 hours?
What is the purpose of curing the test specimens in water after 24 hours?
- To achieve uniform compaction of the concrete
- To enhance the strength of the concrete (correct)
- To prevent excessive laitance formation
- To reduce the temperature of the concrete
What is the minimum relative humidity required for storing the test specimens?
What is the minimum relative humidity required for storing the test specimens?
What is the maximum permissible deviation in temperature during the storage of test specimens?
What is the maximum permissible deviation in temperature during the storage of test specimens?
What is the size of the test specimens if the largest nominal size of the aggregate does not exceed 2 cm?
What is the size of the test specimens if the largest nominal size of the aggregate does not exceed 2 cm?
What is the primary factor that compressive strength of concrete depends on?
What is the primary factor that compressive strength of concrete depends on?
At what ages are tests typically made for compressive strength?
At what ages are tests typically made for compressive strength?
What is the minimum number of specimens required for testing at each selected age?
What is the minimum number of specimens required for testing at each selected age?
What is the size of the cube mould conforming to IS: 10086-1982?
What is the size of the cube mould conforming to IS: 10086-1982?
What is the condition of the aggregates required for each batch of concrete?
What is the condition of the aggregates required for each batch of concrete?
What is the purpose of the compressive testing machine in the testing procedure?
What is the purpose of the compressive testing machine in the testing procedure?
What is the purpose of wiping the bearing surfaces of the testing machine clean in Step 7?
What is the purpose of wiping the bearing surfaces of the testing machine clean in Step 7?
What is the recommended rate of load application in the compression testing machine?
What is the recommended rate of load application in the compression testing machine?
What is the significance of aligning the axis of the specimen with the center of thrust of the spherically seated platen in Step 9?
What is the significance of aligning the axis of the specimen with the center of thrust of the spherically seated platen in Step 9?
What is the purpose of noting the appearance of the concrete and any unusual features in the type of failure in Step 11?
What is the purpose of noting the appearance of the concrete and any unusual features in the type of failure in Step 11?
What is the duration of curing for the specimens before they are tested by the compression testing machine?
What is the duration of curing for the specimens before they are tested by the compression testing machine?
What is the purpose of not applying a packing material between the faces of the test specimen and the steel platen in Step 10?
What is the purpose of not applying a packing material between the faces of the test specimen and the steel platen in Step 10?