1993 Aashto Guide For Design Of Pavement Structures Pdf To Excel
> Geotechnical Aspects of Pavements Reference Manual Appendix C: 1993 AASHTO Design Method C.1 Introduction The AASHTO Guide for Design of Pavement Structures (AASHTO, 1993) is the primary document used to design new and rehabilitated highway pavements. Approximately 80% of all states use the AASHTO pavement design procedures, with the majority using the 1993 version. All versions of the AASHTO Design Guide are empirical design methods based on field performance data measured at the AASHO Road Test in 1958-60. Chapter 3 of this manual describes the evolution of the various versions of the AASHTO Design Guide.
Please refer to Huang “Pavement Analysis and Design. 2nd edition.32logMR 8. 2 1.36log(SN 1) 0.DESIGN CURVE AND EQUATION OF AASHTO 1993 AASHTO 1993 Design Equation 1 3 4 logW18 Zr (So ) 9.20 2 PSI 5 log 4.40 6 (SN 1)5.07 1094 0. 5 2.19 If you are interested in deriving of AASHTO 1993 design equation. 1993 AASHTO Guide For The Design of Pavement Structures@, Brent Rahut Engineering Inc.
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Geotechnical inputs to the 1993 AASHTO design procedure are detailed in Chapter 5. Chapter 6 provides some design examples using the 1993 AASHTO procedures. The overall approach of the 1993 AASHTO procedure for both flexible and rigid pavements is to design for a specified serviceability loss at the end of the design life of the pavement. Serviceability is defined in terms of the Present Serviceability Index, PSI, which varies between the limits of 5 (best) and 0 (worst). Serviceability loss at end of design life, ΔPSI, is partitioned between traffic and environmental effects, as follows (see also Figure 3.8): (C.1) ΔPSI = ΔPSI TR + ΔPSI SW + ΔPSI FH in which ΔPSI TR, ΔPSI SW and ΔPSI FH are the components of serviceability loss attributable to traffic, swelling, and frost heave, respectively.
The structural design procedures for swelling and frost heave are the same for both flexible and rigid pavements; these are detailed in Appendix G of the 1993 AASHTO Guide. The structural design procedures for traffic are different for flexible and rigid pavement types. These procedures are summarized below in Sections C.2 and C.3, respectively. For simplicity, only the design procedures for new construction are summarized here. The design procedures for reconstruction are similar, except that characterization of recycled materials may be required. See the 1993 AASHTO Guide for details of additional procedures ( e.g., determination of remaining structural life for overlay design) relevant to rehabilitation design.
Section 2: Approved Design Method 2.1 Introduction The TxCRCP-ME design program and the AASHTO DARWin® 3.1 program are available to department personnel through the district pavement engineer. Consultants may obtain the TxCRCP-ME program from the district pavement engineer or the Pavement Asset Management Section of the Maintenance Division.
The AASHTO Guide also contains design procedures for rehabilitation of rigid pavements, including asphalt concrete overlays or Portland cement concrete (PCC) overlays of existing rigid pavements. Contact the district pavement engineer or MNT – Pavement Asset Management for further assistance.
2.2 TxCRCP-ME Design Program for CRCP The design method was developed under department research project 0-5832, “Develop Mechanistic/Empirical Design for CRCP.” An elaborate three-dimensional finite element analysis was conducted to identify the mechanisms of punchout distress in CRCP, and the critical component that may cause the punchout distress was mechanistically evaluated. A full factorial parametric study was performed for significant input variables to compile the database of the analysis results.