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WORLD BANK

WORLD BANK. TCP Design (THIN CONCRETE PAVEMENTS) Juan Pablo Covarrubias Washington 2008. Type of Pavement we are Talking About. PERFORMANCE OF CONCRETE PAVEMENTS. The basic performance principles of Concrete Pavements

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WORLD BANK

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  1. WORLD BANK TCP Design (THIN CONCRETE PAVEMENTS) Juan Pablo Covarrubias Washington 2008

  2. Type of Pavement we are Talking About

  3. PERFORMANCE OF CONCRETE PAVEMENTS The basic performance principles of Concrete Pavements In Chile, the slabs are always curled with the edges lifted up, day and night.

  4. DEFORMATION OF A SLAB15 cm thick, 4 m. long

  5. EFFECT OF SUBGRADE STIFFNESS Armaghani 1993

  6. EFFECT OF SUBGRADE STIFFNESS cantilever Granular CBR 40 cantilever CTB Not bonded (polyethylene)

  7. EFFECT OF SLAB LENGTH cantilever cantilever 1/3 L 1/4 L Length 4,5 m. cantilever = 1,13 m cantilever cantilever 1/3 L 1/4 L Length 1,8 m. Cantilever = 0,45 m

  8. EFFECT OF SLAB LENGTHON SHRINKAGE AND CURLING a > 1

  9. EFFECT OF SLAB LENGTH ON CURLING

  10. SLAB LENGTH AND CURLING 3,8 m 4,5 m Holland 2002

  11. EFFECT OF TIE BARS ON CRACKING OF SLABS Cracking Hiller and Springenschmid, 2004

  12. Development of the Designby TCPavements Research at the University of Illinois Generate Design Method. Coordinate tests at international level

  13. Dx Dx L L Loads of Trucks on Slabs • Minimum Requirement for TCP design: • Maximum slab length less than L • Maximum slab width less than Dx (1/2 lane)

  14. LOADING OF LONG AND SHORT SLABS

  15. Efect of Loads and Slab Geometry on Stresses Top 2.47 Mpa Bottom 0.20 MPa Top 0.52 Mpa Bottom 0.24 MPa

  16. One Axel at the Edge X

  17. LOADS AND STRESSES ON A SLAB WHITH ROCKING

  18. RELATION: length - thickness - tensile stress

  19. EFFECT OF SLAB LENGTH ON CURLING AND OWN WEIGHT STRESSES

  20. Project in GuatemalaSlabs 4,5 m x 3,5 m x 24 cm Position I Position II Position III Position IV

  21. Project in Guatemala Slabs 1,8 m x 2,1 m x 15 cm Posición I Posición II Posición III

  22. Summary Guatemala Project Thin slabs with 30 cm widening

  23. FINITE ELEMENTS ANALISIS Equitensional Curves 450 425 400 375 350 325 300 20 Kg/cm2 275 25 Kg/cm2 Length of slab (cm) 250 30 Kg/cm2 225 200 35 Kg/cm2 175 40 Kg/cm2 150 125 100 75 50 25 0 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 Thickness (cm)

  24. Thicknesses for Same Stresses and Slab Length Slab length change from 4,5 to 1,75 m 20 y = 0,5431x + 2,0129 18 2 R = 0,9954 16 14 12 10 Slabs 1,75 m 8 6 4 2 0 0 5 10 15 20 25 30 35 Slabs 4,5 m cm cm

  25. LOAD POSITION AND SLAB SIZE

  26. Top and Bottom Stresses for Length and Thickness

  27. CHARACTERISTICS of TCP Design Small slabs (1,8 by 2.4 meters) Granular base (fines < 6%) 15 cm thick Impermeable layer between the sub grade and sub base, if needed Thin joint cut (2 mm thick) No joints sealing No dowel bars or tie bars Lateral confinement with curb, shoulder or vertical steel pins Widened outer lane (30 cm)

  28. Design Design method being used: Design with AASHTO with normal slab size (4.5 m long) Determine by finite elements the stresses within the concrete of the slab for the AASHTO design Calculate slab thickness by iteration with ISLAB2000 with the new configuration of slab size and wheel positions (one set of wheels on each slab) to obtain the same stresses than the AASHTO design. The result, by using this new design approach, is a thinner concrete pavement with the same stresses as AASHTO design

  29. Construccion Cost

  30. Long Term Costs: NPV (%) Asphalt Traditional Concrete TCP Time (years) 15 20

  31. Research at U. de Illinois

  32. Sub Grade CBR 3%

  33. Geotextile and Granular Base

  34. Granular Base less 6% Fines

  35. Concrete Slabs finished

  36. ATLAS Machine

  37. ATLAS Machine

  38. Experiences

  39. Constructed Projects

  40. Guatemala • BM3 Acceso CA9 Sur (Puente Villalobos) • Description • Start Year: end 2005 • Length: 1.68km • 120.000.000 Esals • 15 years design • Ciudad de Guatemala, Guatemala • Highway • Pavement structure • 21 cm thick • Granular base and asphalt base • 14.40m to 21.60m Witdh

  41. Guatemala • Ruta CA-01 Occidente Ciudad San Cristobal - San Lucas (Road to Antigua) • Description • Year 2006 • Length: 11.07km • 80.000.000 Esals • Ciudad de Guatemala – Sacatepéquez, Guatemala • Highway • Pavement Structure • 17cm thick • Granular base and asphalt base • 14.40m Witdh

  42. Configuration of Sugar Cane Vehícle (VCMEM)

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