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Building Construction Paper 2,Nov/Dec. 2008  
Questions:   1 2 3 4 5   Main
General Comments
Weakness/Remedies
Strength

Question 2

  1. (a)  Explain the following terms in relation to concrete production:
  2. batching;
  3. compaction;
  4. curing.
  1. Distinguish between mass concrete and reinforced concrete.
  1. (i)         Describe a method of exterminating termites on a building site.

(ii)        Sketch to illustrate a method of preventing termites from entering a building using termite shield.


_____________________________________________________________________________________________________
OBSERVATION

Most candidates were able to:

                        -           explain the given concrete production terminologies correctly;
                        -           describe methods of exterminating termites on a building site.

                        However, majority of them failed to:

                        -           distinguish between mass concrete and reinforced concrete;
                        -           use good sketches to illustrate a method of preventing termites from
                                    entering a  building using termite shield;
           
                        The expected response to question 2 is as given below:

                        (a)(i)    (i)         Batching is the process of measuring the concrete materials in the
                                                given proportions.
                                    (ii)        Compaction is the process of eliminating void from a concrete
                                                 mix.
(iii)      Curing is a process of preventing mixed water from drying out             
quickly or the process of keeping the mixed water in the concrete          for  hydration of the cement.

                        (b)        Mass concrete contains no reinforcement while reinforced concrete
                                    contains steel reinforcement to resist tensile and sharing stresses.

                        (c)(i)    (i)         Application of strong common salt solution.
                                    (ii)        Digging deep to the ground to get the Queen of the termites.  Once
                                                the Queen is removed or killed, the colony is wipe out.

  1. Spraying of chemicals over the site after levelling e.g. Deldrin Dust, Aldrin Dust and Aldrex 20 EC.

    (ii)    Method of preventing termites from entering a building using termite
            shield.

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