Concrete Cracking and Volume Changes Quiz
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Questions and Answers

What are the effects of segregation in concrete?

Decrease in homogeneity, honeycombing, reduction in strength, deterioration, and reduction in durability.

List three causes of segregation in concrete.

Excessive water content in the mix, use of high water-cement ratio, poor graded aggregates.

Define bleeding in the context of concrete.

Appearance of water on the surface after concrete placement and compaction but before it has set.

What are the effects of bleeding in concrete?

<p>Weak and non-uniform top surface, channeled bleeding resulting in porous concrete, laitance reducing cement content.</p> Signup and view all the answers

How can bleeding in concrete be controlled?

<p>Increase in fineness of cement and fine particles, reducing water content, increasing C3A, CaCl2, and alkali content, use of pozzolana, air entrainment.</p> Signup and view all the answers

What is meant by bleeding capacity in concrete?

<p>Volume of water released per unit surface of fresh concrete or per unit volume of concrete or initial water.</p> Signup and view all the answers

Describe the bleeding rate in concrete.

<p>Rate of release of water or subsidence of the surface.</p> Signup and view all the answers

How is the duration of bleeding defined in concrete?

<p>Period elapsed from placing until bleeding stops.</p> Signup and view all the answers

What factors affect the workability of concrete?

<p>Consistency and cohesiveness, which are oppositely influenced by changing specific variables.</p> Signup and view all the answers

What are the main effects of plastic shrinkage cracks in concrete?

<p>Surface cracks due to rapid moisture loss, leading to reduced durability and aesthetics.</p> Signup and view all the answers

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