A Pavement Design and Rehabilitation System

1996 ◽  
Vol 1539 (1) ◽  
pp. 110-115 ◽  
Author(s):  
Jacob Uzan
Keyword(s):  
Load Distribution ◽  
Design Method ◽  
Design Procedure ◽  
Pavement Design ◽  
Equivalent Temperature ◽  
Pavement Condition ◽  
Rehabilitation System ◽  
Overlay Design ◽  
Available Information ◽  
Pavement Thickness

Because the Superpave system is not readily available for use, an interim pavement design and rehabilitation method was developed that can be used for Israeli traffic and environmental conditions. The existing method was upgraded to include most of the relevant available information and to produce reliable pavement design for the specific conditions in Israel. The upgrading concentrated on multiple topics. An axle-load distribution specific to Israeli conditions was included because analysis indicates that axle loads in Israel are typically above the standard 80-kN single axle load. The extended California bearing ratio (CBR) method was adapted to a variety of axle-load combinations by using Miner's law for damage accumulation. Converting the axle-load distribution to the standard 80-kN equivalent single axle load leads to underdesign of approximately 10 percent in pavement thickness (or to a reduction of about 70 percent of the design life). A fatigue consideration to determine the asphalt-layer thickness was added. Local temperatures were analyzed to determine an equivalent temperature for fatigue calculation. For Israeli conditions, an equivalent temperature of 14°C can be used countrywide for asphalt-layer thicknesses up to 250 mm. An overlay design method consistent with the upgraded design procedure was assembled. It includes backcalculation of layer moduli to determine the subgrade CBR and the quality of the pavement layers; pavement condition surveys to evaluate a representative effective thickness of the asphalt layer; and component-layer analysis to determine the overlay thickness.

Flexible Pavement Overlays: The State Experience

1997 ◽  
Vol 1568 (1) ◽  
pp. 139-147
Author(s):  
Peter E. Sebaaly ◽  
Stephen Lani ◽  
Sohila Bemanian ◽  
Christopher Cocking
Keyword(s):  
Design Method ◽  
Design Procedure ◽  
Survey Method ◽  
Department Of Transportation ◽  
Significant Discrepancy ◽  
Design Engineers ◽  
Routine Basis ◽  
Final Design ◽  
Overlay Design ◽  
Nondestructive Testing Method

The design and construction of flexible overlays has become a popular exercise. However, there is not a simple, straightforward, and yet reliable design procedure that the design engineer can implement on a routine basis. The data needed for overlay design are not easily accessible to the design engineer, and yet the accessible data are not fully reliable in most cases. The process by which the design engineers at the Nevada Department of Transportation handle overlay design is presented. The various steps followed and the obstacles that the design engineer encounters in the search for the necessary data and the final design process are described. Major assumptions must be made along the way that could significantly affect the final design. Three case studies are presented. Each project was designed using three different design methods, including the AASHTO nondestructive testing method, the AASHTO condition survey method, and the Nevada Department of Transportation (NDOT) mechanistic overlay design method. All three methods used the same data gathered by the design engineer for each project. The analysis indicates that there is a significant discrepancy between the two AASHTO methods, whereas the NDOT method and the AASHTO condition survey method agreed on one project.

scholarly journals Sensitivity Analysis of Rigid Pavement Design Based on Semi-Empirical Methods: Romanian Case Study

Symmetry ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 168
Author(s):  
Costel Pleșcan ◽  
Elena-Loredana Pleșcan ◽  
Mariana D. Stanciu ◽  
Marius Botiș ◽  
Daniel Taus
Keyword(s):  
Input Data ◽  
Design Method ◽  
Design Procedure ◽  
Plain Concrete ◽  
Empirical Method ◽  
Traffic Volume ◽  
Pavement Design ◽  
Mountainous Area ◽  
Rigid Pavement ◽  
Pavement Structures

Due to the intensive process of road construction or rehabilitation of pavement caused by an increase in traffic volume, in the field of rigid pavement design and research in Romania, we can say that there is a need to improve the design method. In the last decade, more and more researchers have been concerned about climate change and the increase in traffic volume; hence, there is a need for a renewal of the climatological, as well as traffic, databases because these are part of the input data for the design process. The design method currently used in Romania for jointed plain concrete pavement design is NP081/2002. The limitation of the data and the lack of lifetime estimation of structural and functional performance are the main aspects that need to be addressed in the new design procedure. The Mechanistic–Empirical Pavement Design (MEPDG) method offers the possibility of the design of pavement structures by estimating the structural and functional performances. This paper aims to obtain a comparative study of these two methods for the analysis of the input data collected from the field corresponding to the three failure criteria, while the symmetry of the characteristics of the material and their asymmetrical thicknesses are compared, thus contributing to the design of viable and long-lasting pavement structures using a rigid pavement with the specific characteristics of the mountainous area in northeastern Romania on the national road DN17 Suceava—Vatra Dornei. The novelty of this study consists of the implementation of the mechanistic–empirical method MEPDG instead of the old NP081/2002 method used in Romania.

Development of Mechanistic-Empirical Pavement Design in Minnesota

1998 ◽  
Vol 1629 (1) ◽  
pp. 181-188 ◽  
Author(s):  
David Timm ◽  
Bjorn Birgisson ◽  
David Newcomb
Keyword(s):  
Material Characterization ◽  
Design Method ◽  
Laboratory Data ◽  
Design Procedure ◽  
Computer Models ◽  
Pavement Design ◽  
University Of Minnesota ◽  
Motion Data ◽  
Load Spectra ◽  
Weigh In Motion

The next AASHTO guide on pavement design will encourage a broader use of mechanistic-empirical (M-E) approaches. While M-E design is conceptually straightforward, the development and implementation of such a procedure are somewhat more complicated. The development of an M-E design procedure at the University of Minnesota, in conjunction with the Minnesota Department of Transportation, is described. Specifically, issues concerning mechanistic computer models, material characterization, load configuration, pavement life equations, accumulating damage, and seasonal variations in material properties are discussed. Each of these components fits into the proposed M-E design procedure for Minnesota but is entirely compartmentalized. For example, as better computer models are developed, they may simply be inserted into the design method to yield more accurate pavement response predictions. Material characterization, in terms of modulus, will rely on falling-weight deflectometer and laboratory data. Additionally, backcalculated values from the Minnesota Road Research Project will aid in determining the seasonal variation of moduli. The abundance of weigh-in-motion data will allow for more accurate load characterization in terms of load spectra rather than load equivalency. Pavement life equations to predict fatigue and rutting in conjunction with Miner’s hypothesis of accumulating damage are continually being refined to match observed performance in Minnesota. Ultimately, a computer program that incorporates the proposed M-E design method into a user-friendly Windows environment will be developed.

scholarly journals PERANCANGAN PERKERASAN JALAN LINGKAR KOTA KABUPATEN WONOGIRI

Jurnal HPJI ◽  
2019 ◽  
Vol 5 (2) ◽  
pp. 119-128
Author(s):  
Alfiani Yogaturida Isnaini ◽  
Latif Budi Suparma ◽  
Suryo Hapsoro Tri Utomo
Keyword(s):  
Design Method ◽  
Concrete Slab ◽  
Pavement Design ◽  
Slab Thickness ◽  
Ring Road ◽  
Road Pavement ◽  
Road Design ◽  
The Difference ◽  
Aashto 1993 ◽  
Pavement Thickness

Abstract The city ring road of Wonogiri Regency should be constructed based on a pavement design which ensure safety, convenience, but still economical. For this reason, a road pavement design method is needed to be applied in this road design process. The MDP 2017 and AASHTO 1993 road pavement design methods are methods that are often used in Indonesia to design concrete slab for pavement. This study uses both methods to determine the thickness of the concrete slab on the pavement of the Wonogiri Regency City Ring Road. The results of this study indicate that the concrete slab thickness for pavement calculated by MDP 2017 is 31 cm, while that calculated with AASHTO 1993 is 32.25 cm. The difference in the thickness of the concrete plates obtained from these two methods is relatively small. Keywords: road pavement, pavement design, concrete slab, road pavement thickness  Abstrak Jalan lingkar kota Kabupaten Wonogiri harus dibangun berdasarkan rancangan perkerasan jalan yang aman, nyaman, namun tetap ekonomis. Untuk itu, diperlukan suatu metode perancangan perkerasan jalan yang tepat untuk diterapkan pada proses perancangan jalan ini. Metode-metode perancangan perkerasan jalan MDP 2017 dan AASHTO 1993 merupakan metode-metode yang sering digunakan di Indonesia untuk perancangan tebal pelat beton untuk perkerasan jalan. Studi ini menggunakan kedua metode tersebut untuk menentukan tebal pelat beton pada perkerasan jalan lingkar kota Kabupaten Wonogiri. Hasil studi ini menunjukkan bahwa tebal pelat beton untuk perkerasan jalan yang dihitung dengan MDP 2017 adalah 31 cm, sedangkan yang dihitung dengan AASHTO 1993 adalah 32,25 cm. Beda tebal pelat beton yang diperoleh dari kedua metode ini relatif kecil. Kata-kata kunci: perkerasan jalan, perancangan perkerasan, pelat beton, tebal perkerasan jalan

scholarly journals Flexible pavement overlay design of UFJF ring road based on the new Brazilian mechanistic-empirical pavement design method

2020 ◽  
Vol 73 (4) ◽  
pp. 445-452
Author(s):  
Thiago Fávero de Oliveira Machado ◽  
Geraldo Luciano de Oliveira Marques ◽  
Marcos Lamha Rocha
Keyword(s):  
Design Method ◽  
Flexible Pavement ◽  
Pavement Design ◽  
Ring Road ◽  
Overlay Design ◽  
Pavement Overlay

scholarly journals An overview of asphalt pavement design for streets and roads

2020 ◽  
Author(s):  
Luis Ricardo Vásquez-Varela ◽  
Francisco Javier García-Orozco
Keyword(s):  
Design Method ◽  
Design Procedure ◽  
Pavement Design ◽  
Asphalt Pavements ◽  
Analysis And Design ◽  
Incremental Design ◽  
History Of ◽  
Design Factors ◽  
Geotechnical Problems ◽  
Proper Analysis

Pavements are geotechnical problems; consequently, a geotechnical framework is useful to describe their constitutive elements. The design of asphalt pavements for streets and roads evolved from empiric to mechanistic-empiric (M-E) procedures throughout the 20th century. The mechanistic-empiric method, based on layered elastic theory, became a common practice with the publication of separate procedures by Shell Oil, Asphalt Institute, and French LCPC, among others. Since its origin, the M-E procedure can consider incremental pavement design but, only until the beginning of the 21st century, the computational power became available to practicing engineers. American MEPDG represents the state-of-the-art M-E incremental design procedure with significant advantages and drawbacks, the latter mainly related to the extensive calibration activities required to assure a proper analysis and design according to subgrade, climate, and materials at a particular location and for an intended level of reliability. Perpetual pavements are a subset of M-E designed pavements with a proven history of success for the particular conditions where they are warranted. No design method, either the most straightforward empirical approach or the most elaborated incremental mechanistic one, is appropriate without proper knowledge about the fundamental design factors and calibration of the performance models for each distress mode upon consideration.

Updating Pavement Design Procedures for New York State

1996 ◽  
Vol 1539 (1) ◽  
pp. 51-57
Author(s):  
Hong-Jer Chen ◽  
Luis Julian Bendaña ◽  
Dan E. McAuliffe ◽  
Raymond L. Gemme
Keyword(s):  
New York ◽  
Sensitivity Analysis ◽  
Life Cycle ◽  
New York State ◽  
Design Procedure ◽  
Pavement Design ◽  
Life Cycle Costs ◽  
Past Performance ◽  
Design Variables ◽  
Pavement Thickness

New York's effort in adapting concepts from AASHTO's pavement design guide as a basis for a revised state design procedure for thickness of new and reconstructed pavements is summarized. The rationale for this revised procedure was to design more durable pavements and reduce life-cycle costs. New York's past pavement design practice and the background for the revisions are briefly described. A sensitivity analysis was conducted to identify how AASHTO design variables affect pavement thickness. Past performance of selected New York pavements was also studied. The rationale is discussed for determination of appropriate design variables, based on the sensitivity analysis, performance studies, and reviews of past and current practice. Also described is the justification of other design features, such as 50-year design life, granular subgrade, permeable base, edge drains, shorter slabs, maximum and minimum pavement thicknesses, and new dowel and tie-bar designs. Development and implementation of New York's new AASHTO-based thickness design procedure are major steps toward accomplishing the goals of building longer-lasting pavements and reducing life-cycle costs.

scholarly journals New Hungarian Mechanistic-Empirical Design Procedure for Asphalt Pavements

2020 ◽  
Vol 15 (1) ◽  
pp. 161-186
Author(s):  
Csaba Tóth ◽  
Péter Primusz
Keyword(s):  
Material Properties ◽  
Design Method ◽  
Design Procedure ◽  
Design Principles ◽  
Pavement Design ◽  
Asphalt Pavements ◽  
Alternative Procedure ◽  
Ongoing Research ◽  
Empirical Design

Certain elements of the currently used Hungarian pavement design method are based on the mechanistic-empirical pavement design principles, although they are not always readily implemented in practice. When designing a new pavement structure, it is only possible to select predetermined composition from a catalogue. The use of the Hungarian design catalogue is unquestionably comfortable, but nowadays special requirements (e.g. economy, sustainability) have been formulated as well. Those requirements increasingly call for the development of a method that can be used under Hungarian conditions, which can provide for the employment of various material properties. Instead of offering a predefined solution it needs to provide a useful tool for designers to enable realistic comparisons of engineering alternatives. This paper introduces the results of an ongoing research that aims to provide an alternative procedure for the design of newly constructed asphalt pavements. It establishes the framework for better characterization of the material properties of the natural subgrade and bound pavement layers compared to the utilization of predetermined designs. It also provides opportunity to consider local, environmental, geographical and other conditions and innovative building and technology capabilities.

scholarly journals A Two-Round Optimization Design Method for Aerostatic Spindles Considering the Fluid–Structure Interaction Effect

2021 ◽  
Vol 11 (7) ◽  
pp. 3017
Author(s):  
Qiang Gao ◽  
Siyu Gao ◽  
Lihua Lu ◽  
Min Zhu ◽  
Feihu Zhang
Keyword(s):  
Optimal Design ◽  
Optimization Design ◽  
Design Method ◽  
Fluid Structure Interaction ◽  
Design Procedure ◽  
Design Parameters ◽  
Geometrical Parameters ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Aerostatic Spindle

The fluid–structure interaction (FSI) effect has a significant impact on the static and dynamic performance of aerostatic spindles, which should be fully considered when developing a new product. To enhance the overall performance of aerostatic spindles, a two-round optimization design method for aerostatic spindles considering the FSI effect is proposed in this article. An aerostatic spindle is optimized to elaborate the design procedure of the proposed method. In the first-round design, the geometrical parameters of the aerostatic bearing were optimized to improve its stiffness. Then, the key structural dimension of the aerostatic spindle is optimized in the second-round design to improve the natural frequency of the spindle. Finally, optimal design parameters are acquired and experimentally verified. This research guides the optimal design of aerostatic spindles considering the FSI effect.

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