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Q: Heavy foundation stones are not at all necessary to be placed at the bottom layer of road with sub grade cross slope of 1 in 36. Which of the following methods of construction used this concept?
  • A. Telford construction
  • B. Tresaguet construction
  • C. Macadam construction
  • D. Metcalf construction
Correct Answer: Option C - Macadam was the first person who suggested that heavy foundation stones are not at all required to be placed at the bottom layer. • He provided stone of size 5 mm to a uniform thickness of 10 cm • The importance to subgrade drainage and compaction was given so the subgrade was compacted and prepared with cross slope of 1 in 36. • The pavement surface was also given the cross slope of 1 in 36. • Total thickness was kept uniform from edge to centre to a minimum value of 25 cm • The size of broken stone for the top layer was decided on the basis of stability under animal drawn vehicles.
C. Macadam was the first person who suggested that heavy foundation stones are not at all required to be placed at the bottom layer. • He provided stone of size 5 mm to a uniform thickness of 10 cm • The importance to subgrade drainage and compaction was given so the subgrade was compacted and prepared with cross slope of 1 in 36. • The pavement surface was also given the cross slope of 1 in 36. • Total thickness was kept uniform from edge to centre to a minimum value of 25 cm • The size of broken stone for the top layer was decided on the basis of stability under animal drawn vehicles.

Explanations:

Macadam was the first person who suggested that heavy foundation stones are not at all required to be placed at the bottom layer. • He provided stone of size 5 mm to a uniform thickness of 10 cm • The importance to subgrade drainage and compaction was given so the subgrade was compacted and prepared with cross slope of 1 in 36. • The pavement surface was also given the cross slope of 1 in 36. • Total thickness was kept uniform from edge to centre to a minimum value of 25 cm • The size of broken stone for the top layer was decided on the basis of stability under animal drawn vehicles.