FLEXIBLE PAVEMENT DESIGN AND MANAGEMENT: MATERIALS CHARACTERIZATION

TESTING EQUIPMENT WAS DEVELOPED AND FIELD EXPERIMENTATION WAS PERFORMED IN THIS INVESTIGATION INTO THE USE OF BASIC PROPERTIES OF PAVEMENT COMPONENT MATERIALS TO TRANSLATE AASHO ROAD TEST FINDINGS TO OTHER CONDITIONS, AND THUS ULTIMATLEY DEVELOP MORE RATIONAL PAVEMENT DESIGN PROCEDURES. THE INVESTIGATION WAS DIVIDED INTO TWO COORDINATED BUT SEPARATE EFFORTS, NAMELY, CHARACTERIZATION AND SYSTEMS FORMULATION. AN OPERATIONAL PAVEMENT SYSTEMS MODEL (SAMP5) HAS BEEN FORMULATED THAT ORGANIZES THE OVER-ALL INFLUENCING FACTORS SUCH AS MATERIALS CHARACTERISTICS, CONSTRUCTION TECHNIQUES, MAINTENANCE REQUIREMENTS AND ECONOMICS, WITHIN A SUITABLE FRAMEWORK FOR FLEXIBLE PAVEMENT DESIGN AND MANAGEMENT. A COMPUTER PROGRAM WAS PREPARED USING 58 TO 100 INPUT VARIABLE AND THE AASHO INTERIM GUIDES FOR DESIGN OF FLEXIBLE PAVEMENTS AS THE STRUCTURAL SUBSYSTEM. A CONCEPTUAL PAVEMENT SYSTEMS DIAGRAM WAS PREPARED TO ILLUSTRATE THE INTERRELATION OF MANY INPUTS AND SUBSYSTEMS INVOLVED IN THE PAVEMENT DESIGN AND MANAGEMENT PROCESS. THE INPUTS TO THE SYSTEM INCLUDE A RANGE OF LOAD, ENVIRONMENTAL, STRUCTURAL, CONSTRUCTION AND MAINTENANCE VARIABLES, ALL OF WHICH ARE STOCHASTIC IN NATURE AND ARE VARIABLE. THE CHARACTERIZATION OF MATERIALS AS DEFINED IN THIS PROJECT IS THE SELECTION OF CONSTITUTIVE EQUATIONS TO ADEQUATELY MODEL THE RESPONSE OF PAVING MATERIALS TO THE LOADING AND ENVIRONMENTAL CONDITIONS TO WHICH THEY ARE LIKELY TO BE SUBJECTED AS COMPONENTS OF A PAVEMENT. TEMPERATURE WAS FOUND TO BE THE MOST SIGNIFICANT FACTOR IN DETERMINING THE RESPONSE OF ASPHALTIC CONCRETE. THE RESPONSE OF GRANULAR MATERIALS IS TIME-INDEPENDENT AND COMPLETELY RECOVERABLE. WATER CONTENT EXERTS A SIGNIFICANT INFLUENCE ON THE RESPONSE OF THE SUBGRADE SOIL. AN INCREASE IN WATER CONTENT CAUSES A DECREASE IN RESISTANCE TO DEFORMATION OF THE SOIL. DETAILS ARE GIVEN OF THE METHODOLOGY FOR CHARACTERIZATION AND THE DEVELOPMENT AND CONDUCT OF THE EXPERIMENTAL PROGRAM. THE FINDINGS WITH RESPECT TO ASPHALTIC CONCRETE, COHESIVE SUBGRADE SOILS AND MATERIALS ARE DISCUSSED. CONCLUSIONS BASED ON THE STUDY ARE PRESENTED AND RECOMMENDATIONS ARE MADE FOR FUTURE RESEARCH.

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/nchrp/nchrp_rpt_140.pdf
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00775614
• Supplemental Notes:
  • Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
• Corporate Authors:

  Transportation Research Board

  500 Fifth Street, NW
  Washington, DC  United States  20001
• Authors:
  • Nair, K
  • Chang, C Y
• Publication Date: 1973

Media Info

• Media Type: Digital/other
• Features: Appendices; Figures; References; Tables;
• Pagination: 118 p.
• Serial:
  • NCHRP Report
  • Issue Number: 140
  • Publisher: Transportation Research Board
  • ISSN: 0077-5614

Subject/Index Terms

• TRT Terms: Asphalt concrete; Cohesive soils; Computer programs; Flexible pavements; Granular soils; Materials; Pavement design; Paving; Research; Specifications; Subgrade (Pavements); Systems engineering; Temperature; Testing equipment
• Old TRIS Terms: Materials specifications
• Subject Areas: Highways; Materials; Pavements; Research;

Filing Info

• Accession Number: 00211851
• Record Type: Publication
• Files: TRIS, TRB, ATRI
• Created Date: May 15 1974 12:00AM