Utilizing the Canadian Long-term Pavement Performance (C-LTPP) Database for Asphalt Dynamic Modulus Prediction

Utilizing the Canadian Long-term Pavement Performance (C-LTPP) Database for Asphalt Dynamic Modulus Prediction
Author: Richard Christopher Korczak
Publisher:
Total Pages: 95
Release: 2013
Genre:
ISBN:

In 2007, the Mechanistic-Empirical Pavement Design Guide (MEPDG) was successfully approved as the new American Association of State Highway and Transportation Officials (AASHTO) pavement design standard (Von Quintus et al., 2007). Calibration and validation of the MEPDG is currently in progress in several provinces across Canada. The MEPDG will be used as the standard pavement design methodology for the foreseeable future (Tighe, 2013). This new pavement design process requires several parameters specific to local conditions of the design location. In order to perform an accurate analysis, a database of parameters including those specific to local materials, climate and traffic are required to calibrate the models in the MEPDG. In 1989, the Canadian Strategic Highway Research Program (C-SHRP) launched a national full scale field experiment known as the Canadian Long-Term Pavement Performance (C-LTPP) program. Between the years, 1989 and 1992, a total of 24 test sites were constructed within all ten provinces. Each test site contained multiple monitored sections for a total of 65 sections. Each of these sites received rehabilitation treatments of various thicknesses of asphalt overlays. The C-LTPP program attempted to design and build the test sections across Canada so as to cover the widest range of experimental factors such as traffic loading, environmental region, and subgrade type. With planned strategic pavement data collection cycles, it would then be possible to compare results obtained at different test sites (i.e. across traffic levels, environmental zones, soil types) across the country. The United States Long-Term Pavement Performance (US-LTPP) database is serving as a critical tool in implementing the new design guide. The MEPDG was delivered with the prediction models calibrated to average national conditions. For the guide to be an effective resource for individual agencies, the national models need to be evaluated against local and regional performance. The results of these evaluations are being used to determine if local calibration is required. It is expected that provincial agencies across Canada will use both C-LTPP and US-LTPP test sites for these evaluations. In addition, C-LTPP and US-LTPP sites provide typical values for many of the MEPDG inputs (C-SHRP, 2000). The scope of this thesis is to examine the existing data in the C-LTPP database and assess its relevance to Canadian MEPDG calibration. Specifically, the thesis examines the dynamic modulus parameter (|E*|) and how it can be computed using existing C-LTPP data and an Artificial Neural Network (ANN) model developed under a Federal Highway Administration (FHWA) study (FHWA, 2011).

LTPP Computed Parameter

LTPP Computed Parameter
Author: Y. Richard Kim
Publisher:
Total Pages: 239
Release: 2011
Genre: Pavements
ISBN:

The objective of this study was to use readily available binder, volumetric, and resilient material properties in the Long-Term Pavement Performance (LTPP) database to develop E* estimates. This report provides a thorough review of existing prediction models. In addition, several models have been developed using artificial neural networks for use in this project. This report includes assessments of each model, quality control checks applied to the data, and the final structure and format of the dynamic modulus data added to the LTPP database. A program was also developed to assist in populating the LTPP database, and the details of the program are provided in this report.

Long-Term Performance Program

Long-Term Performance Program
Author: R. G. Hicks
Publisher: ASCE Publications
Total Pages: 168
Release: 2001-01-01
Genre: Technology & Engineering
ISBN: 9780784475010

Sponsored by the Highway Division of ASCE; Long-Term Performance Program of the Federal Highway Administration. This collection contains papers from the International Contest on LTPP [Long-Term Performance Program] Data Analysis 1998-1999. This competition involved university students in the analysis of data in the LTPP database. Topics include: effect of locked-in curvature on portland cement concrete pavement; evaluation of a pavement performance prediction model using LTPP data; prediction of pavement performance?a neural network approach; and effectiveness of preventative maintenance strategies for asphalt concrete pavements based on LTPP distress data.

Evaluation of Different Methods for Populating the LTPP Materials Database with the Dynamic Modulus

Evaluation of Different Methods for Populating the LTPP Materials Database with the Dynamic Modulus
Author:
Publisher:
Total Pages:
Release: 2003
Genre:
ISBN:

The NCHRP 1-37A Guide for Mechanistic-Empirical Design of New and Rehabilitated Design Structures introduces the dynamic modulus (|E*|) as the material property to characterize asphalt concrete. This is a significant change from the resilient modulus (M[subscript R]) used in the previous AASHTO Pavement Design Guide. One of the challenges of changing the material characterization is that databases, such as the Long Term Pavement Performance (LTPP) Materials Database, contain older material characterization information. Therefore, databases must be updated to the currently accepted standard. This thesis evaluates two methods to populate the LTTP database with |E*| values: 1) determine the |E*| from different geometries (i.e., cores and prisms) and 2) predicting the |E*| from the measured M[subscript R] values in the database. Acquiring the |E*| from existing pavements is difficult due to the standardized dimensions of the test specimen. Other geometries, indirect tension specimens and prismatic specimens, have been tested to determine if the measured |E*| is statistically different from the modulus obtained from the AASHTO TP 62 protocol. This study provides a comparison of the effects of a non-uniform state of stress and anisotropy. These effects are isolated by comparing specimens prepared by Superpave gyratory compaction and vibratory steel-wheel compaction. The results in the thesis are verified using four 12.5 mm surface course mixtures with different aggregate types and binder types, and one 25.0 mm base mixture. The results are verified using volumetric variations such as different percentage of aphalt cement and air voids. The results show that the difference between the |E*| values obtained from different geometries is statistically insignificant. The results provide justification for using alternative methods for acquiring the |E*| experimentally, specifically from previously constructed pavements. Practioners prefer a mathematical model since measuring the.

LTPP

LTPP
Author:
Publisher:
Total Pages: 16
Release: 1998
Genre: Pavements
ISBN:

Established as part of the Strategic Highway Research Program (SHRP) and now managed by the Federal Highway Administration (FHWA), the Long Term Pavement Performance (LTPP) program faces a significant challenge. Over the past decade, the LTPP program has developed a solid knowledge base for understanding how pavements perform. Its challenge throughout its second decade is to build on this foundation--to further the understanding of why pavements perform as they do. To address this challenge, FHWA has initiated several efforts that require the support and active participation of the States and Provinces. The intent of this document is to describe the challenge the LTPP program faces and explain the efforts underway to address this challenge. This document is presented in the following sections: Introduction; The Challenge; Addressing the Challenge; Critical Issues; and Future Opportunities.

LTPP Data Analysis

LTPP Data Analysis
Author: Kathleen Theresa Hall
Publisher:
Total Pages: 164
Release: 1997
Genre: Pavements
ISBN:

Several important issues concerning the effect of slab support on concrete pavement performance were studied in a National Cooperative Highway Research Program project, "Support Under Concrete Pavements" (NCHRP 1-30). The results were promising, however, the data that were available for analysis were limited. This study was conducted to further field-verify and develop the improved support guidelines proposed in NCHRP 1-30, using the Long-Term Pavement Performance (LTPP) database, in order to establish their practicality and appropriateness for use in concrete pavement design nationwide. This study was also conducted to further field-verify the proposed revised American Association of State Highway and Transportation Officials (AASHTO) performance model to the fullest extent possible using the design, materials, climate, traffic, and performance data available in the LTPP database for General Pavement Section 3 (GPS-3) (jointed plain concrete pavement), GPS-4 (jointed reinforced concrete pavement), and GPS-5 (continuously reinforced concrete pavement). Guidelines, revised on the basis of the results of this field verification study, are presented in the appendix in the form of a proposed addendum to the AASHTO Design Guide. The documentation of these field verification efforts using the LTPP database is provided in this report.

Advances in Materials and Pavement Performance Prediction II

Advances in Materials and Pavement Performance Prediction II
Author: K. Anupam
Publisher: CRC Press
Total Pages: 501
Release: 2020-12-08
Genre: Juvenile Nonfiction
ISBN: 1000343480

Inspired from the legacy of the previous four 3DFEM conferences held in Delft and Athens as well as the successful 2018 AM3P conference held in Doha, the 2020 AM3P conference continues the pavement mechanics theme including pavement models, experimental methods to estimate model parameters, and their implementation in predicting pavement performance. The AM3P conference is organized by the Standing International Advisory Committee (SIAC), at the time of this publication chaired by Professors Tom Scarpas, Eyad Masad, and Amit Bhasin. Advances in Materials and Pavement Performance Prediction II includes over 111 papers presented at the 2020 AM3P Conference. The technical topics covered include: - rigid pavements - pavement geotechnics - statistical and data tools in pavement engineering - pavement structures - asphalt mixtures - asphalt binders The book will be invaluable to academics and engineers involved or interested in pavement engineering, pavement models, experimental methods to estimate model parameters, and their implementation in predicting pavement performance.