Construction Engineering & Management - Vol 3 | 9. Free Fall Non-Tilting Reversible Mixer by Abraham | Learn Smarter
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9. Free Fall Non-Tilting Reversible Mixer

The chapter discusses various types of concrete mixers, focusing on free fall and power mixers. It highlights the operational mechanisms of pan mixers and trough mixers, comparing their efficiency and productivity. Special emphasis is placed on the importance of adhering to mixing guidelines for achieving homogeneous concrete mixtures, as well as the impact of mixing duration on concrete quality.

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Sections

  • 1

    Free Fall Non-Tilting Reversible Mixer

    This section discusses the mechanisms and characteristics of free fall non-tilting reversible mixers, along with their applications and comparisons to power mixers.

    Learning Practice

  • 1.1

    Functionality Of Reversible Mixer

    This section explains the functionality of reversible mixers, particularly focusing on the operation of RMC transit mixers and differentiating free fall and power mixers.

    Learning Practice

  • 2

    Power Mixer

    This section covers the mechanics and applications of power mixers in concrete mixing, distinguishing them from free-fall mixers.

    Learning Practice

  • 2.1

    Overview And Mechanism

    This section discusses the different types of concrete mixers, including free fall mixers and power mixers, focusing on their mechanisms and efficiency in mixing concrete.

    Learning Practice

  • 2.2

    Comparison With Free Fall Mixers

    This section compares free fall mixers with power mixers, highlighting their mechanisms, capabilities, and productivity differences.

    Learning Practice

  • 2.3

    Pan Mixer

    This section covers the pan mixer, a power mixer type that utilizes high-speed rotation and paddle systems for efficient concrete mixing.

    Learning Practice

  • 2.3.1

    Features Of Pan Mixer

    Pan mixers are power mixers that provide efficient and homogeneous mixing through rapid rotary motion and specially designed blades that prevent material sticking.

    Learning Practice

  • 2.3.2

    Buttering Operation

    This section explains the buttering operation used in concrete mixing and the functionality of various types of mixers.

    Learning Practice

  • 2.3.3

    Productivity And Variants

    This section discusses various types of concrete mixers, focusing on their mechanisms, productivity, and operational efficiencies.

    Learning Practice

  • 2.4

    Planetary Mixer

    This section covers the various types of concrete mixers, primarily focusing on the planetary and trough mixers, their mechanisms, and operational efficiency.

    Learning Practice

  • 2.5

    Trough Mixer

    The section provides an overview of trough mixers, their mechanism, and how they compare with other types of concrete mixers.

    Learning Practice

  • 2.5.1

    Design And Configuration

    This section discusses various types of mixers used in concrete mixing, highlighting differences between free-fall and power mixers, their configurations, and operational effectiveness.

    Learning Practice

  • 2.5.2

    Mixing Intensity And Productivity

    This section explores different types of concrete mixing methods, focusing on free fall non-tilting reversible mixers and power mixers, their operational mechanisms, and productivity.

    Learning Practice

  • 3

    Mixing Duration And Guidelines

    This section discusses the mechanisms and guidelines for mixing concrete, focusing on different mixer types and the importance of adhering to specified mixing durations.

    Learning Practice

  • 3.1

    Importance Of Mixing Duration

    This section explores the critical role of mixing duration in concrete preparation, detailing the implications of under-mixing and over-mixing.

    Learning Practice

  • 3.2

    Guidelines From Is 4925

    This section outlines the guidelines for using different types of concrete mixers according to IS 4925, highlighting their operational characteristics and recommended mixing durations.

    Learning Practice

  • 3.3

    Impact Of Mixing Duration

    This section discusses the significance of mixing duration in concrete production, emphasizing its impact on homogeneity and workability.

    Learning Practice

  • 4

    Cycle Time Of Concrete Mixer Machines

    The section discusses the types of concrete mixers, their mechanisms, and the factors influencing the cycle time of concrete mixer machines.

    Learning

  • 4.1

    Components Of Cycle Time

    This section discusses the components of cycle time in concrete mixer machines, including loading, mixing, and discharging time.

    Learning Practice

  • 4.2

    Productivity Estimation

    This section discusses various types of concrete mixers and their productivity, focusing on the differences between free fall and power mixers.

    Learning Practice

  • 4.2.1

    Batch Production Calculation

    This section discusses the calculation of batch production in concrete mixing, emphasizing the differences between various types of mixers and their efficiencies.

    Learning Practice

  • 4.3

    Job Efficiency Factors

    This section focuses on the factors affecting the efficiency of concrete mixing, comparing free fall mixers with power mixers.

    Learning Practice

  • 5

    Estimation Example

    The section discusses the different types of concrete mixers and illustrates the estimation of productivity for a concrete batching plant.

    Learning Practice

  • 5.1

    Concrete Batching Production Example

    This section discusses various types of concrete mixing equipment and their functionalities, distinguishing between free fall and power mixers.

    Learning Practice

  • 6

    General Guidelines For Mixing Concrete

    This section outlines the key guidelines for mixing concrete, emphasizing the importance of thorough mixing and adherence to specified durations to achieve a homogeneous mix.

    Learning Practice

  • 6.1

    Mixing Process

    The section discusses the various types of concrete mixers and their operational mechanisms, focusing on the mixing process and productivity comparisons.

    Learning Practice

  • 6.2

    Maintenance And Cleaning

    This section highlights the operational functionalities and essential maintenance aspects of various concrete mixers, including free fall and power mixers.

    Learning Practice

  • 6.3

    Quality Check Of Concrete

    This section covers the different types of concrete mixers, emphasizing the importance of mixing duration for achieving quality concrete.

    Learning Practice

References

20 b.pdf

Class Notes

Memorization

What we have learnt

  • Free fall and power mixers ...
  • Pan and trough mixers offer...
  • Optimal mixing duration is ...

Final Test

Revision Tests