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Civil engineering
Highlights:
 Wheel invention – necessity of hard surface
 Mortar usage – Romans
 Macadam’s scientific approach – economical
construction
 Early development
 Roman roads
 Tresaguet construction
 Metcalf construction
 Telford construction
 Macadam construction
 Further developments
3
T2: 2.1
 Walked
 Dragged, rolled, or pushed
what he or she needed to
transport
 Alone or as a group
 Early “roads” were worn paths
 Most likely a sled / sledge
6000 BC 4000 BC 2000 BC 0 2000 AD
7000 BC Domesticated
Animals
The development of the wheel led to the
development of wheeled vehicles.
 Mesopotamia
 Hard surfaces for
travel purposes
 Most likely packed
material, soil, etc.
6000 BC 4000 BC 2000 BC 0 2000 AD
3500 BC
Domesticated
Animals
6000 BC 4000 BC 2000 BC 0 2000 AD
3000 BC
Sails Wheeled
Vehicles
 Crete - Mediterranean
6000 BC 4000 BC 2000 BC 0 2000 AD
1500 BC
• First stone
surfaced roads
constructed
 Mayans, Aztecs, Incas are building roads
away from the coast
 Why?
◦ Move armies to
conquer others
or defend themselves
◦ Move food and trade goods
6000 BC 4000 BC 2000 BC 0 2000 AD
1500 BC
 The oldest mode of travel obviously was on the foot-paths.
 Animals were also used to transport men and materials.
 Later simple animal drawn vehicles were developed and this
became a common and popular mode of transportation for very
long period after the invention of wheel.
 This brought up the necessity of providing a hard surface for
these wheeled vehicles to move on.
 Such a hard surface is believed to have existed in the period of
about 3500 B.C.
 Only during the period of roman empire, roads were constructed
in large scale.13
 Roman Empire
 Used broken stones
in mortar for
roadway surfaces
6000 BC 4000 BC 2000 BC 0 2000 AD
300 BC
 During this period of roman civilization many roads were built of
stone blocks of considerable thickness.
 The appian way was built in 312 B.C. extending over 580 km
which illustrate the road building technique used by Romans.
 The main features of Roman roads are:
 They were built straight regardless of gradients.
 They were built after the soft soil was removed and a hard stratum was
reached.
 The total thickness of the construction was as high as 0.75 to 1.2 m at some
places, even though the magnitude of wheel loads of animal drawn vehicles
was very low.
15
16
19
Although the above construction was strong but economic
cost of construction cannot be justified at all, if this
technique is compared with the modern trend of pavement
design based on more scientific approaches.
 After fall of roman empires, their technique of road construction
did not gain popularity in other countries.
 Until the 18th century there is no evidence of any new
construction method, except the older concept of using thick
construction of road beds as the roman did.
 The main feature of Tresaguet proposal (1775) was that the
thickness of construction need to be only in the order of 30 cm.
 Further due consideration was given by him to subgrade
moisture condition and drainage of surface water.
21
 He was engaged on road construction works in
England during the period Tresaguet was working
in France.
 He apparently followed the recommendations of
robert phiilips.
 He was responsible for the construction of about
290 km of road in the northern region of England.
 Much of his work was not recorded.
22
 He began work in early 19th century.
 He also believed in using heavy foundation stones above
the soil subgrade in order to keep the road foundation
firm.
 He insisted on providing a definite cross slope for top
surface of the pavement by varying the thickness of
foundation stones
 Subgrade is kept horizontal and hence subgrade drainage
was not proper.
23
24
 The importance of subgrade draining and compaction
was recognized and cross slope of 1 in 36 was
proposed from subgrade level itself.
 The first method based on scientific thinking.
 It was realized that the stresses due to wheel loads of
traffic gets decreased to the lower layers of the
pavement and therefore it is not required to provide
large boulders and stones or soling course at the
lower layer of the pavement.
25
26
Plank roads were typically constructed of wood planks
two inches thick and eight feet long, which were nailed to four-
inch-square stringers at a 90-degree angle.
30
 Macadam’s method of construction gained recognition
as a scientific method of construction and hence was
adopted by various countries with slight modifications.
 One of the most popular methods which is even now
prevalent many countries is the water bound macadam
(WBM) construction, known after Macadam’s technique.
 The next development was the penetration and
bituminous macadam roads etc, cement concrete roads,
soil stabilization techniques.
32

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Historical development of road construction

  • 2. Highlights:  Wheel invention – necessity of hard surface  Mortar usage – Romans  Macadam’s scientific approach – economical construction
  • 3.  Early development  Roman roads  Tresaguet construction  Metcalf construction  Telford construction  Macadam construction  Further developments 3 T2: 2.1
  • 4.  Walked  Dragged, rolled, or pushed what he or she needed to transport  Alone or as a group  Early “roads” were worn paths
  • 5.
  • 6.  Most likely a sled / sledge 6000 BC 4000 BC 2000 BC 0 2000 AD 7000 BC Domesticated Animals
  • 7. The development of the wheel led to the development of wheeled vehicles.
  • 8.  Mesopotamia  Hard surfaces for travel purposes  Most likely packed material, soil, etc. 6000 BC 4000 BC 2000 BC 0 2000 AD 3500 BC
  • 9. Domesticated Animals 6000 BC 4000 BC 2000 BC 0 2000 AD 3000 BC Sails Wheeled Vehicles
  • 10.
  • 11.  Crete - Mediterranean 6000 BC 4000 BC 2000 BC 0 2000 AD 1500 BC • First stone surfaced roads constructed
  • 12.  Mayans, Aztecs, Incas are building roads away from the coast  Why? ◦ Move armies to conquer others or defend themselves ◦ Move food and trade goods 6000 BC 4000 BC 2000 BC 0 2000 AD 1500 BC
  • 13.  The oldest mode of travel obviously was on the foot-paths.  Animals were also used to transport men and materials.  Later simple animal drawn vehicles were developed and this became a common and popular mode of transportation for very long period after the invention of wheel.  This brought up the necessity of providing a hard surface for these wheeled vehicles to move on.  Such a hard surface is believed to have existed in the period of about 3500 B.C.  Only during the period of roman empire, roads were constructed in large scale.13
  • 14.  Roman Empire  Used broken stones in mortar for roadway surfaces 6000 BC 4000 BC 2000 BC 0 2000 AD 300 BC
  • 15.  During this period of roman civilization many roads were built of stone blocks of considerable thickness.  The appian way was built in 312 B.C. extending over 580 km which illustrate the road building technique used by Romans.  The main features of Roman roads are:  They were built straight regardless of gradients.  They were built after the soft soil was removed and a hard stratum was reached.  The total thickness of the construction was as high as 0.75 to 1.2 m at some places, even though the magnitude of wheel loads of animal drawn vehicles was very low. 15
  • 16. 16
  • 17.
  • 18.
  • 19. 19 Although the above construction was strong but economic cost of construction cannot be justified at all, if this technique is compared with the modern trend of pavement design based on more scientific approaches.
  • 20.
  • 21.  After fall of roman empires, their technique of road construction did not gain popularity in other countries.  Until the 18th century there is no evidence of any new construction method, except the older concept of using thick construction of road beds as the roman did.  The main feature of Tresaguet proposal (1775) was that the thickness of construction need to be only in the order of 30 cm.  Further due consideration was given by him to subgrade moisture condition and drainage of surface water. 21
  • 22.  He was engaged on road construction works in England during the period Tresaguet was working in France.  He apparently followed the recommendations of robert phiilips.  He was responsible for the construction of about 290 km of road in the northern region of England.  Much of his work was not recorded. 22
  • 23.  He began work in early 19th century.  He also believed in using heavy foundation stones above the soil subgrade in order to keep the road foundation firm.  He insisted on providing a definite cross slope for top surface of the pavement by varying the thickness of foundation stones  Subgrade is kept horizontal and hence subgrade drainage was not proper. 23
  • 24. 24
  • 25.  The importance of subgrade draining and compaction was recognized and cross slope of 1 in 36 was proposed from subgrade level itself.  The first method based on scientific thinking.  It was realized that the stresses due to wheel loads of traffic gets decreased to the lower layers of the pavement and therefore it is not required to provide large boulders and stones or soling course at the lower layer of the pavement. 25
  • 26. 26
  • 27.
  • 28.
  • 29. Plank roads were typically constructed of wood planks two inches thick and eight feet long, which were nailed to four- inch-square stringers at a 90-degree angle.
  • 30. 30
  • 31.
  • 32.  Macadam’s method of construction gained recognition as a scientific method of construction and hence was adopted by various countries with slight modifications.  One of the most popular methods which is even now prevalent many countries is the water bound macadam (WBM) construction, known after Macadam’s technique.  The next development was the penetration and bituminous macadam roads etc, cement concrete roads, soil stabilization techniques. 32