Basic Concrete Technology - Pre-training Analysis

50 Questions | Total Attempts: 661

SettingsSettingsSettings
Please wait...
Basic Concrete Technology - Pre-training Analysis

A simple survey to analyse the current level of knowledge and to create interest towards the intended training. Session.


Questions and Answers
  • 1. 
    Why are normal cement normally called "Portland" Cement?
    • A. 

      It was named after the inventor

    • B. 

      It is the name of a type of limestone in England

    • C. 

      In the olden days, it was used for ports

    • D. 

      It contains portland as part of its ingredients

    • E. 

      The hydration process produces portland as a by-product

  • 2. 
    The basic ingredients for making concrete are: (tick all that apply)
    • A. 

      Cement

    • B. 

      Sand

    • C. 

      Stones

    • D. 

      Water

  • 3. 
    The following are basic characteristics of concrete: (tick all that apply)
    • A. 

      Strong in compression

    • B. 

      Strong in tension

    • C. 

      Workable before hardening

    • D. 

      Less resistant to fire (compared to steel)

    • E. 

      Can be moulded into almost any shape

  • 4. 
    What is "Cast-in-situ" concrete?
    • A. 

      Concrete is casted in one location only.

    • B. 

      One continuous pour without any construction joints.

    • C. 

      Refers to concrete already casted in its place in the formwork.

    • D. 

      Concrete is poured directly into where it forms the structure

  • 5. 
    Which of the following statements are true about Precast Concrete? (Check all that apply)
    • A. 

      They are normally manufactured in a factory

    • B. 

      They are transported to site to form part or whole of a structure

    • C. 

      They can only be used for non-structural (i.e. not designed to carry loads) structures

    • D. 

      They can also be precasted on site

  • 6. 
    Which of the following statements are true about Prestressed Concrete? (Check all that apply)
    • A. 

      They are normally manufactured in a factory

    • B. 

      They are transported to site to form part or whole of a structure

    • C. 

      They can only be used for non-structural (i.e. not designed to carry loads) structures

    • D. 

      They contain prestressed cables

  • 7. 
    What is the difference between cement and concrete
    • A. 

      Cement is one of the ingredients in concrete.

    • B. 

      Concrete is one of the ingredients in cement.

    • C. 

      Concrete is hardened cement.

    • D. 

      Concrete contained steel bars.

  • 8. 
    Concrete cannot harden without water.
    • A. 

      True

    • B. 

      False

  • 9. 
    Concrete cannot harden under water.
    • A. 

      True

    • B. 

      False

  • 10. 
    Which are the following statements are true about Hydration of Cement? (Tick all that apply)
    • A. 

      It releases heat.

    • B. 

      It requires water.

    • C. 

      It produces water.

    • D. 

      It is a chemical reaction between cement and water.

    • E. 

      It is a irreversible process..

  • 11. 
    In the construction industry, what does the term "Aggregates" mean?
    • A. 

      Sand

    • B. 

      Natural occuring stones

    • C. 

      Gravel

    • D. 

      Rocks crushed to certain sizes

    • E. 

      All of the above

  • 12. 
    Which of the following shapes of aggregates produces the best workability in concrete?
    • A. 

      Rounded

    • B. 

      Angular

    • C. 

      Irregular

    • D. 

      Flaky

    • E. 

      Elongated

  • 13. 
    What does "Aggregate Grading" means?
    • A. 

      The strength of the aggregates.

    • B. 

      The distribution of its particle size.

    • C. 

      The PH of the aggregates as measured in accordance to standards

    • D. 

      The hardness of the aggregates.

    • E. 

      The durability of the aggregates.

  • 14. 
    What is the difference in using bigger or smaller aggregates?
    • A. 

      Bigger aggregates results in higher workability.

    • B. 

      Smaller aggregates enhance hydration of cement, thus higher strength.

    • C. 

      Bigger aggregates prevents honeycombing in concrete

    • D. 

      No difference in affecting working with or quality of concrete. Only costs are different.

  • 15. 
    Aggregates are divided into either ‘coarse’ or ‘fine’ categories. - Coarse aggregates are particulates that are greater than ...
    • A. 

      1.5mm

    • B. 

      4.75mm

    • C. 

      10.5 mm

    • D. 

      20.0mm

  • 16. 
    The shape and surface texture of aggregate influence the ...
    • A. 

      Workability of fresh concrete

    • B. 

      Compressive strength of hardened concrete

    • C. 

      Heat of hydration

    • D. 

      Setting time

  • 17. 
    Common tests for determination of strength of aggregate are...
    • A. 

      Aggregate Crushing Value

    • B. 

      Aggregate Impact Value

    • C. 

      Ten per cent fines value

    • D. 

      Le Chatelier Test Value

  • 18. 
    The Modulus of Elasticity of aggregate affects...
    • A. 

      Creep of concrete

    • B. 

      Shrinkage of concrete

    • C. 

      Workability of concrete

    • D. 

      Slump of concrete

  • 19. 
    The determination of moisture content of an aggregate is necessary in order to...
    • A. 

      Determine the net water-cement ratio for a batch of concrete

    • B. 

      Calculate the slump when slump test is not available

    • C. 

      Estimate workability before actual batching

    • D. 

      Determine the heat of hydration of cement

  • 20. 
    Bulking of fine aggregate refers to...
    • A. 

      The increase in the volume of a given mass of fine aggregate caused by the presence of water

    • B. 

      The overloading of fine aggregate in lorries for mass production of concrete

    • C. 

      The ratio of fine aggregate to coarse aggregate

    • D. 

      The estimation of fine aggregate required for a production batch of concrete

  • 21. 
    The materials whose presence may adversely affect the strength, workability and long-term performance of concrete are termed deleterious materials.   These substances found in aggregates can be grouped under the following categories:
    • A. 

      Impurities interfering with the process of hydration of cements

    • B. 

      Coatings preventing the development of good bond between aggregate and the cement paste

    • C. 

      Unsound particles which are weak or bring about chemical reaction between the aggregate and cement paste

    • D. 

      Unsoundness of aggregates affecting the ability of the aggregate to resist excessive changes in volume

  • 22. 
    The aggregate is said to be unsound when...
    • A. 

      Volume changes result in the deterioration of concrete

    • B. 

      Its strength is solely dependent on cement paste

    • C. 

      The ratio between fine and coarse aggregates is too large

    • D. 

      It is susceptible to chemical attack

  • 23. 
    Alkali-aggregate reaction (AAR) is the reaction between active silica constituents of the aggregate and alkalies i.e. Na2O and K2O present in the cement.   It can be manifested through:
    • A. 

      Swelling which results in disruption of concrete with the spreading of pattern cracks and eventual failure of the concrete structures

    • B. 

      Low slump values affecting the workability of concrete contributing to the occurrence of honeycombs

    • C. 

      Low early strength

    • D. 

      High water requirements which directly affect concrete strength

  • 24. 
    The larger the maximum size of the aggregate, the smaller is the cement requirement for a particular water-cement ratio.
    • A. 

      True

    • B. 

      False

  • 25. 
    The maximum size of aggregate influences the compressive strength of concrete in that, for a particular volume of aggregate, the compressive strength tends to increase with the decrease in the size of the coarse aggregate.
    • A. 

      True

    • B. 

      False

Back to Top Back to top