VDOT MECHANSTIC EMPIRICAL PAVEMENT DESIGN (MEPDG) IMPLEMENTATION
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2 VDOT MECHANSTIC EMPIRICAL PAVEMENT DESIGN (MEPDG) IMPLEMENTATION 2018 Virginia Concrete Conference Richmond, Virginia Girum Merine, PE Senior Pavement Engineer, VDOT Material Division March 2, 2018
3 Presentation Outline I. Introduction and background of MEPDG II. Overview of MEPDG design process III. Design of Concrete Pavement using AASHTOWare Pavement ME IV. VDOT MEPDG Implementation Overview
4 VDOT HAS ADOPTED MEPDG!!! As of January 1st, 2018 MEPDG is official design method AASHTOWare Pavement ME software Where does VDOT use MEPDG? Interstate and Primary routes New, reconstruction, and lane widening We will continue to use VDOT s Secondary & Subdivision Pavement Design Guide & Procedures on Secondary & Subdivision streets* Some high volume secondary roads with AADT > 10,000 maybe designed using MEPDG at discretion of Districts Material Engineer.
5 I. INTRODUCTION AND BACKGROUND OF MEPDG PROCEDURE
6 What is Mechanistic Empirical Pavement Design Guide (MEPDG)? Based on Mechanistic-Empirical principles Performance based on distress and ride quality Mechanistically: Calculates pavement responses(stresses, strains, and deflections) due to loading and environment. Use pavement responses to compute incremental damage overtime. Empirically: Link structural response and pavement distresses (i.e. rutting, cracking, faulting, punchout, and IRI etc.) Developed by AASHTO
7 Why Do We Need a New Pavement Design Procedures? Current practice is AASHTO 1993 pavement design guide Developed based on road tests from Limitations 1950s materials, traffic,and construction methods One subgrade type (A-6) One environment (Ottawa Illinois) Only 2 years of service Limited traffic Environment One PCC and HMA mix
8 MEPDG Development AASHTO Joint Task Force on Pavements (JTFP) initiated MEPDG in late 1990s Performance studies such as LTPP and MnRoad provided inputs to MEPDG development Various NCHRP studies (NCHRP 1-37A, 1-40A, 1-40D) Adopted as AASHTO s Interim Pavement Design Guide in 2008
9 Fundamental Differences between AASHTO 93 & MEPDG Parameter AASHTO 93 MEPDG Traffic Equivalent Single Axle Load (ESAL) and traffic volume Axle load spectrum, volume distributions, tire pressure, etc. Climate Design Criteria Model development Impacts not adequately accounted for Serviceability Index One location/materials Weather station data; actual impact of temperature & moisture on material responses. Actual distresses used by the agencies to manage their roadway system. ~2,500 LTPP locations, wider range of materials
10 How many states are adopting MEPDG? Implemented (Asphalt pavement and/or overlays): 14 states Planning to implement (Asphalt pavement and/or overlays): 31 states Source: MEPDG National User Group Meeting, December 2016
11 How many states are adopting MEPDG? Implemented (Concrete pavement and/or overlays): 13 states Planning to implement (Concrete pavement and/or overlays): 32 states Source: MEPDG National User Group Meeting, December 2016
12 II. OVERVIEW OF MEPDG DESIGN PROCESS
13 MEPDG Design Process Climate Materials Traffic Stress, Strain, or Deflection Transfer Function Distress Layer Properties Adjustment Performance Threshold
14 MEPDG Design It is not just about thickness or structure!! Improved handling of climatic effects and traffic loadings Various hierarchical Input Levels Depending on availability of information & project Performance based on distress and ride quality Measurable unlike PSI Ability to calibrate and set threshold limits to local conditions
15 III. Design of Concrete Pavements using AASHTOWare Pavement ME
16 Types of New Concrete Pavement Designed Using Pavement ME Continuously Reinforced Concrete Pavements (CRCP) Jointed Plain Concrete Pavements (JPCP)
17 Rigid Pavement Distress Predicted by Pavement ME Continuously Reinforced Concrete Pavements (CRCP) Punchouts IRI Jointed Plain Concrete Pavements (JPCP) Joint Faulting Transverse Cracking IRI
18 Rigid Pavement Design - Pavement ME Required Inputs Thickness PCC Material Volumetrics and aggregate type Thermal Properties Mix Properties Strength JPCP Design Properties (joint spacing, slab width, dowel diameter, etc.) CRCP Design Properties (% steel, bar diameter, shoulder type, base type, etc.) VDOT MEPDG User Manual contains information regarding Virginia Specific input parameters.
19 Impact of Various Inputs in predicted distress Transverse Cracking (% Slab) Effect of Slab width on JPCP Transverse Cracking Pavement Age (Years) 12 ft Slab Width 14 ft Slab Width in slab TT = 3500
20 Impact of Various Inputs in predicted distress Effect of Joint Spacing on JPCP Transverse Cracking Source: NCHRP 1-37 A - Chapter 4
21 Impact of Various Inputs in predicted distress Effect of Shoulder Type on CRCP # punch out # Punchout per mile AC Shoulder Tied PCC Shoulder Separate PCC Shoulder 8 in Slab 12 ft slab width Pavement Age (Years)
22 IV. VDOT MEPDG IMPLEMENTATION OVERVIEW
23 Develop Inputs Review Models Materials Training Traffic Climate VDOT MEPDG Implementation Journey Local Calibration Understanding output Staff Software Shadow Design January 1 st, 2018 Fully Implemented Policy Connect with VDOT business practices (user manual, MOI) 23
24 MEPDG Implementation Working Groups Technical Working Group (TWG) Members (VDOT, VTRC, Industry, FHWA) Work on technical issues (user manual, modelling, and input values) Meets once a month to discuss on technical issues Stakeholder Group Consists of VDOT, FHWA, VTRC and Industry Periodic updates on progress & timeline Monthly Teleconference
25 VDOT s MEPDG Implementation Plan Where does VDOT use MEPDG? Interstate and Primary routes New, reconstruction, and lane widening We will continue to use VDOT s Secondary & Subdivision Pavement Design Guide & Procedures on Secondary & Subdivision streets* Some high volume secondary roads with AADT > 10,000 maybe designed using MEPDG at discretion of Districts Material Engineer.
26 How Does MEPDG incorporated into VDOT Practice? VDOT has developed MEPDG User Manual User Manual is available for downloading: docs.asp Updates on MOI Chapter III and VI were included in regards to MEPDG Training to VDOT and Consultants All VDOT specific inputs files are available in VDOT external site for downloading:
27 What s Beyond Implementation? Provide continuous support for VDOT and Industry pavement designers Review of pavement designs Plan incorporation of MEPDG for rehab projects Review and assess new software versions Enhancement of material library Set up a long term planning for continuous enhancements
28 Thank You Any Questions? Girum Merine
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