Civil Engineering Materials, Testing & Evaluation - Vol 1 | 8. Segregation by Abraham | Learn Smarter
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Knowledge
8. Segregation

The chapter outlines the behavior and properties of fresh concrete, addressing critical phenomena such as segregation, bleeding, slump loss, and re-tempering. It emphasizes the importance of understanding these aspects for effective handling, placement, and finishing on construction sites. Additionally, various control measures and practices are discussed, alongside the use of admixtures, to optimize the characteristics of fresh concrete.

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Sections

  • 1

    Segregation

    Segregation in fresh concrete refers to the separation of its components, leading to non-uniform compositions that can negatively impact structure quality.

    Learning Practice

  • 1.1

    Definition

    Fresh concrete's properties are essential for quality and strength, influenced by phenomena such as segregation and bleeding.

    Learning Practice

  • 1.2

    Types Of Segregation

    This section explains the concept of segregation in fresh concrete, outlining its types, causes, effects, and prevention methods.

    Learning Practice

  • 1.3

    Causes

    This section discusses the causes of issues affecting fresh concrete, including segregation, bleeding, slump loss, and re-tempering.

    Learning Practice

  • 1.4

    Effects

    This section outlines the effects of segregation, bleeding, slump loss, and re-tempering on the properties and performance of fresh concrete.

    Learning Practice

  • 1.5

    Prevention Methods

    This section discusses methods to prevent issues such as segregation, bleeding, slump loss, and re-tempering in fresh concrete.

    Learning Practice

  • 2

    Bleeding

    This section defines bleeding in concrete, outlines its types, causes, effects, and control measures.

    Learning Practice

  • 2.1

    Definition

    This section defines fresh concrete and discusses its critical properties, including segregation, bleeding, slump loss, and re-tempering.

    Learning Practice

  • 2.2

    Types Of Bleeding

    This section discusses the definition, types, causes, effects, and control measures of bleeding in fresh concrete.

    Learning Practice

  • 2.3

    Causes

    This section highlights the causes, effects, and prevention methods for the phenomena of segregation, bleeding, slump loss, and re-tempering in fresh concrete.

    Learning Practice

  • 2.4

    Effects

    This section discusses critical behaviors of fresh concrete, including segregation, bleeding, slump loss, and re-tempering, and their effects on the final concrete quality.

    Learning Practice

  • 2.5

    Control Measures

    This section outlines the control measures needed to address issues such as segregation, bleeding, slump loss, and re-tempering in fresh concrete.

    Learning Practice

  • 3

    Slump Loss

    Slump loss refers to the reduction in workability of fresh concrete over time, impacting placement and compaction.

    Learning Practice

  • 3.1

    Definition

    This section introduces the fundamental concepts of fresh concrete, covering critical phenomena affecting its performance, such as segregation, bleeding, slump loss, and re-tempering.

    Learning Practice

  • 3.2

    Typical Timeline

    This section details the typical timeline and factors influencing the behavior of fresh concrete, including segregation, bleeding, slump loss, and re-tempering.

    Learning Practice

  • 3.3

    Causes

    This section elucidates the significant causes of issues in fresh concrete, including segregation, bleeding, slump loss, and re-tempering, which affect the final hardened concrete quality.

    Learning Practice

  • 3.4

    Effects

    This section discusses the effects of segregation, bleeding, slump loss, and re-tempering on fresh concrete, emphasizing their impacts on strength, durability, and performance.

    Learning Practice

  • 3.5

    Control Measures

    Control measures for fresh concrete address segregation, bleeding, slump loss, and re-tempering to ensure quality and durability.

    Learning Practice

  • 4

    Re-Tempering

    Re-tempering involves the re-introduction of water to regain workability in concrete that has started to set.

    Learning Practice

  • 4.1

    Definition

    This section introduces the crucial concepts related to fresh concrete, including segregation, bleeding, slump loss, and re-tempering, emphasizing their effects on concrete quality.

    Learning Practice

  • 4.2

    Context

    This section examines significant properties of fresh concrete, including segregation, bleeding, slump loss, and re-tempering, which impact the quality and durability of hardened structures.

    Learning Practice

  • 4.3

    Consequences

    This section discusses the adverse effects of segregation, bleeding, slump loss, and re-tempering on fresh concrete, emphasizing their significance for construction quality.

    Learning Practice

  • 4.4

    Is Code Guidelines

    This section addresses guidelines for managing fresh concrete behaviors according to IS codes, focusing on segregation, bleeding, slump loss, and re-tempering.

    Learning Practice

  • 4.5

    Alternatives To Re-Tempering

    This section discusses various alternatives to re-tempering concrete, emphasizing methods that maintain concrete workability without compromising its quality.

    Learning Practice

  • 5

    Field Practices To Minimize Defects In Fresh Concrete

    This section outlines essential field practices aimed at minimizing defects in fresh concrete, emphasizing effective handling, placement, and supervision.

    Learning Practice

  • 5.1

    Site Handling And Transportation

    Effective handling and transportation methods are crucial in fresh concrete management to prevent issues like slump loss, segregation, and bleeding.

    Learning Practice

  • 5.2

    Placing Techniques

    Placing techniques in concrete work are vital for ensuring proper handling and compaction of fresh concrete, influencing its overall durability and strength.

    Learning Practice

  • 5.3

    Timing And Supervision

    Proper timing and supervision during concrete placement are crucial for ensuring quality and preventing issues like slump loss.

    Learning Practice

  • 6

    Testing Of Fresh Concrete Properties

    This section discusses the critical properties of fresh concrete, including segregation, bleeding, slump loss, and re-tempering, emphasizing their impact on construction quality.

    Learning Practice

  • 6.1

    Slump Test (Is 1199:1959)

    The slump test measures the workability of fresh concrete, indicating its consistency and ease of placement.

    Learning Practice

  • 6.2

    Bleeding Test

    The bleeding test measures the amount of water rising to the surface of freshly mixed concrete, which affects its quality and workability.

    Learning Practice

  • 6.3

    Segregation Resistance Test

    This section discusses the segregation resistance test, an important evaluation for fresh concrete, focusing on the separation of its components.

    Learning Practice

  • 6.4

    Temperature And Setting Time

    This section discusses the effect of temperature on the setting time of fresh concrete and its consequences on concrete quality.

    Learning Practice

  • 7

    Role Of Admixtures In Controlling Fresh Concrete Behavior

    Admixtures are essential additives that improve the workability, durability, and overall performance of fresh concrete during its initial phase.

    Learning Practice

  • 7.1

    Plasticizers And Superplasticizers

    Plasticizers and superplasticizers are crucial additives that improve the workability and fluidity of fresh concrete without increasing water content.

    Learning Practice

  • 7.2

    Air-Entraining Agents

    Air-entraining agents are admixtures that improve the workability and durability of fresh concrete by introducing microscopic air bubbles, thus enhancing its performance.

    Learning Practice

  • 7.3

    Retarders

    Retarders are essential admixtures that delay the setting time of fresh concrete, helping to manage workability under certain conditions.

    Learning Practice

  • 7.4

    Viscosity-Modifying Admixtures (Vmas)

    Viscosity-modifying admixtures (VMAs) are added to concrete to enhance its performance by controlling segregation and bleeding.

    Learning Practice

  • 8

    Guidelines From Indian Standards And Codes

    This section discusses the impact of various factors on fresh concrete, including segregation, bleeding, slump loss, and re-tempering, and provides guidelines from Indian standards.

    Learning Practice

  • 9

    Effects On Hardened Concrete And Long-Term Durability

    Improper behavior in fresh concrete significantly impacts the long-term strength and durability of hardened concrete structures.

    Learning Practice

References

Chapter_8_Fresh.pdf

Class Notes

Memorization

What we have learnt

  • Fresh concrete properties s...
  • Segregation and bleeding ar...
  • Proper handling and site pr...

Final Test

Revision Tests