Question

1. Rusting and corrosion of steel bars inside reinforced concrete may cause severe damage to the structure. Which of the following methods cannot be used to improve corrosion resistance of steel?
   1. Increase the thickness of concrete cover
   2. Using concrete with higher w/c
   3. Adding mineral admixture to the concrete
   4. Using steel bars alloyed with copper elements

2. Unlike concrete and steel, timber is a natural material with unique structures. Which of the following statements about the timber structures is not correct?
   1. There is one and only one annual ring formed in a trunk every season
   2. The cells and vessels of sapwood are open, which also act as channels for the transportation of nutrients from root to leaves
   3. Hardwood is usually darker in color, and hardwood trees usually have broad leaves
   4. The wood on outside of trees is younger than that on inside of trees

3. Timber usually has to undergo processing before it is sold as a construction material. Which of the following statements about the processing of timber is not correct?
   1. Different sawing patterns have an effect on the vulnerability of wood to warping and cupping
   2. Seasoned timber will continue to lose moisture during its service life
   3. For a given species of wood, higher appearance grades usually means higher strength
   4. Solar seasoning gives faster drying with better control than air seasoning.

Answer 1

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