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About construction of rigid pavement

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  4. 4. PUBLIC WORKS DEPARTMENT- AN OVERVIEW  Public Works Department (PWD), under the Ministry of Public Works department, is the pioneer in construction arena of Uttar Pradesh.  It plays a pivotal role in the implementation of government construction projects  To accelerate the construction of bridges in the state, Uttar Pradesh State Bridge Corporation was founded in 1973.  In year 2004-05, Uttar Pradesh state highways authority was established to overcome with problem of pavements in state. 4
  5. 5. 5 INTRODUCTION  Development of a country depends on the connectivity of various places with adequate road network.  Roads constitute the most important mode of communication in areas where railways have not developed much.  India has one of the largest road networks in the world (over 3 million km at present).For the purpose of management and administration, roads in India are divided into the following five categories: • National Highways (NH) • State Highways (SH) • Major District Roads (MDR) • Other District Roads (ODR) • Village Roads (VR)
  6. 6. WHAT IS ROAD AND PAVEMENT ?  Road is an open, generally public way for the passage of vehicles, people, and animals.  Pavement is finished with a hard smooth surface. It helped make them durable and able to withstand traffic and the environment. They have a life span of between 20 – 30 years. • FUNCTIONS • One of the primary functions of pavement is load distribution. It can be characterized by the tire loads, tire configurations, repetition of loads, and distribution of traffic across the pavement, and vehicle speed 6
  7. 7. 7 TYPES OF PAVEMENTS There are various types of pavements depending upon the materials used; a briefs description of all types is given here- FLEXIBLE PAVEMENT Bitumen has been widely used in the construction of flexible pavements for a long time. This is the most convenient and simple type of construction. The cost of construction of single lane bituminous pavement varies from 20 to 30 lakhs per km in plain area. Flexible pavement have-  Have low flexural strength  Load is transferred by grain to grain contact  Have low completion cost but repairing cost is high  Have low life span (High Maintenance Cost)
  8. 8. RIGID PAVEMENT • Rigid pavements, though costly in initial investment, are cheap in long run because of low maintenance costs, The cost of construction of single lane rigid pavement varies from 35 to 50 lakhs per km in plain area, • Rigid pavement have-  Deformation in the sub grade is not transferred to subsequent layers  Design is based on flexural strength or slab action  Have high flexural strength  No such phenomenon of grain to grain load transfer exists  Have low repairing cost but completion cost is high  Life span is more as compare to flexible (Low Maintenance Cost) 8
  9. 9. 9 Longitudinal joint Transverse joint Subgrade Base Surface Texture Surface smoothness Thickness Design Dowel bars Concrete materials Tiebars Basic Components of a Concrete Pavement
  10. 10. 1. Preparation of base 2. Form working 3. Preparation of subgrade 4. Watering of base 5. Joints 6. Material mix & placing 7. Compaction 10
  11. 11. Using mix Concrete , there some Point to construct the road 11 8. Finishing of surface 8A. Floating 8B. Belting 8C. Brooming 9. Curing 10. Joint filling 11. Edging 12. Open to traffic
  12. 12. 1. Rolling on sub grade by roller 2. Filling the granular soil in the weak part and pot holes 3. Correct the soil coat , Camber , longitudinal slop When concrete direct laid on subgrade, For preventing the water-seepaging into the soil , used water proof paper on entire length. 12
  15. 15. Choose any one type of base 1. W.B.M. base As base material of W.B.M. Road; stone ballast, concrete 10-15cm layer are used. For bonding between concrete slab & W.B.M. used 1:2 cement wash on W.B.M. 2. Concrete base On the road used 10cm Cement concrete(1:2:4) or lime concrete(16:32:64) 15
  16. 16. 3. Granular medium material layer 10-15cm composite layer of sand , moorum , bajri are used for better drainage facilities 4. Stabilization soil 16
  17. 17. Material for form work- Wooden sheets, battens, plywood, fibre hard board, steel plates, angles, rope, minerals. 1. before using form work, it should free from all type material like as dust ,cement. 2. To placing the concrete in appropriate depth used 2.5-5cm thick and 3mtr long wooden sheeting. 17
  18. 18. 3. The depth of wooden block must be same as level of slab thick. 4. After 24hrs form work displaced next length of road. 18
  19. 19. If base is dry Than using the sprinkling process on it properly after that placing the concrete. 19
  20. 20. Where is necessary to provide transverse, Longitudinal joints; there wedge of woods, metals fix on level of concrete. After setting of concrete it should be pull out. If provided the dowel bar in joints, bars should be fit at right position. 20
  21. 21. Mixer is equipment that mix the concrete using distinct amount of cement , concrete, sand and water. Concrete slab should have more than 5-10cm thick cause of drying. Used two type mixer- 1. Batch mixer- at site, used for small road construction 2. Continuous mixer- Continuous mixer used for large construction . if distance is more from site , mix concrete transported at site within setting time. 21
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  23. 23. 23 Laying of polyethylene sheet over DLC
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  25. 25. Two methods generally used in placing of concrete- 1. Alternate bay method- Placed the concrete on both side of road alternatively like as1,3,5… part at one side and 2,4,6… part other side . 1st side 2nd side This method have slow process due to road traffic problems. 25
  26. 26. 2. Continuous bay method- construct one side of road regularly, if completed some part of first side than construct other side. this method have fast process without no obstruction of traffic 26
  27. 27. Purpose of compaction is that to pull out air from void and make concrete harden. Compaction done by- 1.mechanically surface vibrator 2. manually hand tempers 27
  28. 28. 8. Finishing of surface 1.Floating- For levelling the surface use floating, scree- ding , power trowel. So that there is no acceptable more than 3mm variation in concrete level surface. 2.Belting- For making surface clean used belting process. Belt is nothing but a 15-30cm thick sheets of canvass which have more length than road. 28
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  30. 30. 3. Brooming- Brooming is the process in which we made rough surface parallel to road by brush. It useful in avoiding slip & comfortable travelling on road . the depth of line on road no more than 1.5mm. 30
  31. 31. 31 Texturing of finished surface by texturing machine
  32. 32. 9. Curing Curing is the name of increasing the hydration process of cement. after setting the concrete , curing process done till 14-28days. 32
  33. 33. Some method of curing are- 1.Shading concrete works 2. Covering with hessian & gunny bags 3. Sprinkling of water 4.By ponding 5. Membrane curing 6. Steam curing 33
  34. 34. 34 CURING
  35. 35. 10. Filling joint After drying road, clean the joints and fill the shelling compound or hot bitumen . also bitumen fill road bank. 35
  36. 36. 11. Edging To protect damaging the sides of concrete pavements used over burnt brick work. in place of brick, provided kerb of pre mix concrete. 36
  37. 37. Generally after a month, road should be open to traffic. If used rapid hardening cement it take 7 days to open traffic. 37
  38. 38. Advantages of Concrete Road • Durability and maintenance free life • Vehicles consume less fuel • Resistant to automobile fuel spillage and extreme weather • Greener process • Saving of natural resources • Eco friendly process 38
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