Implementation of the AASHTO Pavement Design Procedures into MULTI-PAVE PDF
Preview Implementation of the AASHTO Pavement Design Procedures into MULTI-PAVE
Implementation of the AASHTO Pavement Design Procedures into MULTI-PAVE Master Degree Project Abiy Bekele Division of Highway and Railway Engineering Department of Civil and Architectural Engineering Royal Institute of Technology SE-100 44 Stockholm TRITA-VBT 11:10 ISSN 1650-867X ISRN KTH/VBT-11/10-SE Stockholm 2011 Implementation of the AASHTO Pavement Design Procedures into MULTI-PAVE Abiy Bekele Graduate Student Infrastructure Engineering Division of Highway and Railway Engineering School of Architecture and the Built Environment Royal Institute of Technology (KTH) SE- 100 44 Stockholm [email protected] Abstract: This thesis implements the empirical pavement design procedures for flexible as well as rigid pavement by American Association of State Highways and Transportation Officials (AASHTO) into two MATLAB modules of MULTI-PAVE. MULTI-PAVE was developed as a teaching tool that performs pavement thickness design for multiple design procedures using a common input file and a common output format. The AASHTO components were developed in accordance with the 1993 AASHTO Pavement Design Guide, and verified against the original design method. The thicknesses of the Asphalt Concrete, Base Course and Sub-base Course are the design outputs for flexible pavement. For rigid pavement, the thickness of slab is determined for various types of concrete pavements. The modules will be included in a MULTI-PAVE framework to compare the design outputs with other design methods. KEY WORDS: AASHTO Flexible Pavement Design, AASHTO Rigid Pavement Design, AASHTO Road Test, MULTI-PAVE i ii Acknowledgement My first gratitude goes to my families who have been with me all those ways to get here. I would also want to thank my advisor, Dr Michael T. Behn, for cooperating with me and facilitating the needs of the project. Above all I would like to thank God for making this happen. iii iv List of Symbols Layer coefficient for AC Layer coefficient for BC Layer coefficient for SBC c Serviceability value when pavement is considered out of 1 function Initial serviceability trend value Crack index Drainage coefficient Thickness index Thickness of AC Thickness of BC Thickness of SB Fall deflection Spring deflection Elastic modulus of PCC ’ Compressive strength of PCC c Reliability factor Equivalent single axle load factor J Load transfer coefficient Modulus of sub grade reaction Nominal axle load in kips Axle load parameter Drainage coefficient for BC Drainage coefficient for SBC Resilient modulus Serviceability trend value p Initial serviceability value o PSI Pavement Serviceability Index p Terminal serviceability value t R Reliability Combined standard error of traffic prediction SN Structural Number SN Structural Number of AC 1 SN Structural Number of BC 2 SN Structural Number of SBC 3 Modulus of rupture of concrete SV Slope Variance u Relative damage of a pavement layer f Accumulated axle load application v Accumulated axle load application up to class 2 crack develops Accumulated 18 kips single axle load Standard normal deviate Function of axle load and design thickness Change in pavement Serviceability Index Function of axle load and design thickness vi List of Abbreviations AASHTO -American Association of State Highway and Transportation Officials AC - Asphalt Concrete ASTM - American Society for Testing and Materials BC - Base Course CRCP - Concrete Reinforced Concrete Pavement CBR - California Bearing Ratio ESALs - Equivalent Single Axle Load HRB - Highway Research Board JPCP - Jointed Plain Concrete Pavement JRCP - Jointed Reinforced Concrete Pavement PCC - Portland Cement Concrete RD - Rut Depth SBC - Sub-base Course WASHO - Western Association of State Highways Officials vii viii
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