CALCULATION AND DESIGN OF FLEXIBLE PAVEMENTS - POLAND

IN THE CURRENT PRACTICE OF THE DESIGN OF PAVEMENT STRUCTURES, A FEW EMPIRICAL METHODS (PI/IBD, THE MODIFIED METHOD OF THE ASPHALT INSTITUTE AND THE METHOD OF ELASTIC DEFLECTIONS) ARE APPLIED. IN POLAND: THE STRENGTHENING OF FROST-DAMAGED PAVEMENTS IS, IN THE MAJORITY OF CASES, CARRIED OUT IN SUCH A MANNER AS TO INCREASE THE THICKNESS OF THE EXISTING STRUCTURE BY MEANS OF ASPHALTS OR STABILIZED BASE MATERIAL AND ASPHALT. IN ORDER TO MAKE THE METHODS FOR CALCULATING THE THICKNESS OF PAVEMENT STRUCTURES MORE ACCURATE, THERE IS A TENDENCY IN POLAND TOWARDS THE ESTABLISHMENT OF A METHOD OF DESIGN BASED ON THE MODULI OF ELASTICITY OF THE SOIL AND OF THE MATERIALS OF CONSTRUCTION, WHILE AT THE SAME TIME TAKING INTO ACCOUNT, IN THE CONSTRUCTION OF FLEXIBLE PAVEMENTS, THE DISTRIBUTION OF THE TENSILE AND SHEAR STRESSES. DATA PRESENTED DEMONSTRATE THAT THE REPRODUCTION OF A CONCRETE ROAD OR AIRFIELD RUNWAY ON A GREATLY REDUCED SCALE CAN BE CARRIED OUT BY SIMPLIFYING THE PROBLEM SO THAT IT IS REDUCED TO A 2-COURSE SYSTEM, KNOWN AS A SLAB RESTING ON AN ELASTIC SUBGRADE. IN THAT CASE, THE MODEL OF THE PAVEMENT WILL BE THE RESULT OF ACCEPTING A THEORETICAL SYSTEM FOR THE SLAB AND THE SUB-GRADE BASED ON THE FINDINGS OF THE THEORY AND THE CONTENT OF THE HYPOTHESES DETERMINING THE SHARE OF THE SUB-GRADE IN THE OPERATION OF THE STRATIFIED SYSTEM. DURING THE REPRODUCTION OF THE METHOD OF BRINGING ABOUT THE DEFLECTION OF THE SLAB, TERMED INFINITE, WITHIN THE LIMITS OF THE ELASTIC DEFORMATIONS OF THE SLAB AND THE SUB-GRADE, BETTER CONFORMITY WITH ACTUAL CONDITIONS WAS OBTAINED FOR TESTS ON MODELS CONDUCTED IN ACCORDANCE WITH THE FIRST SYSTEM, THAT IS TO SAY, IN ACCORDANCE WITH WINKLER'S PRINCIPLES FOR THE THEORETICAL MODEL OF THE SUB-GRADE. THE ESTIMATION OF THE ELASTICITY CHARACTERISTICS OF THE MODEL OF THE SUB-GRADE BY ITS DETERMINATION AS A VALUE OF THE RIGIDITY RADIUS CONSTITUTES A CONSIDERABLE SIMPLIFICATION OF THE MODEL TESTS ON SLABS RESTING ON AN ELASTIC SUB-GRADE ACCORDING TO WINKLER.

• Supplemental Notes:
  • No I-14, pp 2-22, 7 FIG, 11 TAB
• Authors:
  • Wojciechowski, H
• Publication Date: 1967

Media Info

• Serial:
  • Perm Intl Assoc Road Congresses Proc
  • Publisher: Xiiith Congress, Tokyo

Subject/Index Terms

• TRT Terms: Asphalt; Base course (Pavements); Building materials; Concrete pavements; Elastic deformation; Elasticity (Mechanics); Empirical methods; Flexible pavements; Frost damage; Modulus of elasticity; Pavement design; Pavements; Paving; Shear stress; Slabs; Stabilized materials; Stiffness; Subgrade (Pavements); Tension; Thickness
• Uncontrolled Terms: Model tests; Pavement thickness; Tensile stress
• Old TRIS Terms: Layered system mechanics
• Subject Areas: Highways; Pavements;

Filing Info

• Accession Number: 00205526
• Record Type: Publication
• Files: TRIS
• Created Date: May 21 1994 12:00AM