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Building Construction Paper 2,May/June 2009  
Questions:   1 2 3 4 5   Main
General Comments
Weakness/Remedies
Strength

Question 4
  1. State four principles of a drainage scheme.
  2. List three waste appliances used in plumbing.
  3. Explain each of the following terms in relation to concrete work:
    1. batching;
    2. compaction;
    3. curing.
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OBSERVATION

Majority of the candidates were able to:

  • state the principles of a drainage scheme;
  • list the waste appliances used in plumbing.

However, they failed to explain terms relating to concrete works.  The expected response to question 4 is as given below:

(a)        Principles of a drainage scheme are:

  • Inspection chamber should be constructed at change of direction or gradient to facilitate cleaning and inspection.
  • Pipes should be laid in straight lines between chambers.
  • The pipe should be non-absorbent, smooth in bore, durable and of adequate strength.
  • The pipe should be well ventilated to prevent accumulation of foul gases.
  • Traps must have adequate water seal.
  • Drains should be water tight and air tight.
  • The drainage system should be accessible for cleaning and inspection.
  • Branches should be connected to the main line in an inspection chamber.
  • The three types of waste appliances used in plumbing system are
    • wash hand basin
    • bath
    • kitchen sink
    • bidet
    • shower tray
    • belfast sink.
  • Explanation of terms in concrete works:
    • Batching is the process of measuring the quantities of each of the materials in a concrete mix.
    • Compaction is the process of tamping or vibrating fresh concrete to obtain a dense mass.
Curing is the method of keeping a newly placed concrete moist until it gains sufficient strength.
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