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Segregation in Concrete Mixtures

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Questions and Answers

What is the primary reason for segregation in a concrete mixture?

Inadequate curing of the concrete after placement

Insufficient vibration during the mixing process

Poorly designed concrete mix with low water content

Differences in the size of particles in the concrete mix (correct)

What is the term for the surface evidence of water rising to the top of freshly placed concrete?

Microcracking

Segregation

Laitance (correct)

Bleeding

What is the primary consequence of bleeding in concrete?

Creation of water voids and decreased bond strength (correct)

Increased bonding between aggregates and paste

Increased risk of microcracking

Reduced strength due to a higher water content

What is the primary method for preventing segregation in concrete?

Properly grading aggregates and designing the mix Signup and view all the answers

What is the term for the separation of the constituents from a heterogeneous mixture?

Segregation Signup and view all the answers

What is the primary purpose of adding air entrainment to the mix in fresh concrete?

To prevent bleeding and reduce segregation Signup and view all the answers

What is the primary factor that affects the strength of hardened concrete?

All of the above Signup and view all the answers

What is the primary purpose of reducing the time between placing and start of curing in plastic shrinkage prevention?

To prevent plastic shrinkage cracking Signup and view all the answers

What is the primary difference between compressive strength and tensile strength?

Compressive strength is the ability to resist pushing forces, while tensile strength is the ability to resist stretching or breaking Signup and view all the answers

What is the primary purpose of measuring the flexural strength of hardened concrete?

To measure the resistance of unreinforced concrete slabs or beams to failure in bending Signup and view all the answers