10 Questions
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?
Weak and non-uniform top surface, channeled bleeding resulting in porous concrete, laitance reducing cement content.
How can bleeding in concrete be controlled?
Increase in fineness of cement and fine particles, reducing water content, increasing C3A, CaCl2, and alkali content, use of pozzolana, air entrainment.
What is meant by bleeding capacity in concrete?
Volume of water released per unit surface of fresh concrete or per unit volume of concrete or initial water.
Describe the bleeding rate in concrete.
Rate of release of water or subsidence of the surface.
How is the duration of bleeding defined in concrete?
Period elapsed from placing until bleeding stops.
What factors affect the workability of concrete?
Consistency and cohesiveness, which are oppositely influenced by changing specific variables.
What are the main effects of plastic shrinkage cracks in concrete?
Surface cracks due to rapid moisture loss, leading to reduced durability and aesthetics.
Test your knowledge on the causes of concrete cracking related to volume changes at early and later ages, the impact of restraint, tensile strength, shrinkage stress, and plastic deformation. Learn about plastic settlement cracks and the subsidence of concrete surfaces.
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