scholarly journals Influence of asphalt visco-elastic properties on flexible pavement performance

2016 ◽  
Vol 11 (4) ◽  
pp. 313-323 ◽  
Author(s):  
Rita Kleizienė ◽  
Audrius Vaitkus ◽  
Donatas Čygas
Keyword(s):  
Elastic Properties ◽  
Asphalt Mixture ◽  
Pavement Design ◽  
Pavement Performance ◽  
Elastic Behaviour ◽  
Main Challenge ◽  
Complex Shear ◽  
Pavement Structure ◽  
Pavement Structures

Even though every layer of pavement structure is important and affects pavement performance, the asphalt layers visco-elasticity plays significant role. Bitumen properties, as well as asphalt mixture properties, vary depending on temperature and loading conditions. These variations influence entire pavement bearing capacity and has to be evaluated in pavement design. The main challenge is material behaviour description through simple models to incorporate them to pavement design. Generally, pavements are designed using Multilayer Elastic Theory assuming that all materials are elastic, isotropic, and homogenous. This paper presents analysis of two pavement structures response calculated according to three pavement design approaches. The dynamic modulus and phase angle of asphalt mixtures was estimated using Hirsch model after binder complex shear modulus tests. The visco-elastic behaviour was described with rheological Huet-Sayegh model and pavement responses estimation was done using MnLayer and ViscoRoute2 software. The analysis reviled static and dynamic load influence on pavement structure based on elastic and visco-elastic properties of asphalt layers. This allowed optimisation of layer thicknesses and determination of more cost beneficial pavement structure with appropriate performance.

Use of Long-Term Pavement Performance Data to Develop Traffic Defaults in Support of Mechanistic-Empirical Pavement Design Procedures

2003 ◽  
Vol 1855 (1) ◽  
pp. 176-182 ◽  
Author(s):  
Weng On Tam ◽  
Harold Von Quintus
Keyword(s):  
Pavement Design ◽  
Vehicle Classification ◽  
Pavement Performance ◽  
Traffic Data ◽  
Design Procedures ◽  
Load Spectra ◽  
State Highway ◽  
Pavement Structures ◽  
Empirical Design

Traffic data are a key element for the design and analysis of pavement structures. Automatic vehicle-classification and weigh-in-motion (WIM) data are collected by most state highway agencies for various purposes that include pavement design. Equivalent single-axle loads have had widespread use for pavement design. However, procedures being developed under NCHRP require the use of axle-load spectra. The Long-Term Pavement Performance database contains a wealth of traffic data and was selected to develop traffic defaults in support of NCHRP 1-37A as well as other mechanistic-empirical design procedures. Automated vehicle-classification data were used to develop defaults that account for the distribution of truck volumes by class. Analyses also were conducted to determine direction and lane-distribution factors. WIM data were used to develop defaults to account for the axle-weight distributions and number of axles per vehicle for each truck type. The results of these analyses led to the establishment of traffic defaults for use in mechanistic-empirical design procedures.

scholarly journals Long-Term Performance of Pavement Structures with Cold In-Place Recycled Base Course

2021 ◽  
Vol 16 (2) ◽  
pp. 48-65
Author(s):  
Audrius Vaitkus ◽  
Judita Gražulytė ◽  
Andrius Baltrušaitis ◽  
Jurgita Židanavičiūtė ◽  
Donatas Čygas
Keyword(s):  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Asphalt Pavements ◽  
Recycled Asphalt ◽  
Binding Agents ◽  
Pavement Structure ◽  
Pavement Structures ◽  
Base Course ◽  
Surface Distress ◽  
Foamed Bitumen

Properly designed and maintained asphalt pavements operate for ten to twenty-five years and have to be rehabilitated after that period. Cold in-place recycling has priority over all other rehabilitation methods since it is done without preheating and transportation of reclaimed asphalt pavement. Multiple researches on the performance of cold recycled mixtures have been done; however, it is unclear how the entire pavement structure (cold recycled asphalt pavement overlaid with asphalt mixture) performs depending on binding agents. The main objective of this research was to evaluate the performance of cold in-place recycled asphalt pavements considering binding agents (foamed bitumen in combination with cement or only cement) and figure out which binder leads to the best pavement performance. Three road sections rehabilitated in 2000, 2003, and 2005 were analysed. The performance of the entire pavement structure was evaluated in terms of the International Roughness Index, rut depth, and pavement surface distress in 2013 and 2017.

scholarly journals Development of a Full-Depth Wheel Tracking Test for Asphalt Pavement Structure: Methods and Performance Evaluation

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Hui Wang ◽  
Zepeng Fan ◽  
Jiupeng Zhang
Keyword(s):  
Performance Evaluation ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Single Layer ◽  
Test Method ◽  
Shanxi Province ◽  
Wheel Tracking Test ◽  
Pavement Structure ◽  
Pavement Structures ◽  
Wheel Tracking

The rutting performance of asphalt pavement structure relies on the high temperature properties of asphalt mixture as well as the pavement structure and thickness. In order to investigate the influence of the structure and thickness, a full-depth wheel tracking test is developed in this research by improving the conventional wheel tracking test apparatus. The newly proposed test method is capable of varying its load speed and load size, controlling its specimen temperature gradient, and simulating the support conditions of actual asphalt pavement. The full-depth wheel tracking test based rutting performance evaluation of different asphalt pavement structures indicates that it is not reasonable to explain the rutting performance of asphalt pavement structure from the point of view of single-layer asphalt mixture rutting performance. The developed full-depth wheel tracking test can be used to distinguish rutting performance of different asphalt pavement structures, and two of five typical asphalt pavement structures commonly used in Shanxi Province were suggested for use in practical engineering.

Study on Flexible Base Asphalt Pavement Design System Based on the Dynamic Modulus

2013 ◽  
Vol 788 ◽  
pp. 619-622
Author(s):  
Li Yin
Keyword(s):  
Mechanical Properties ◽  
Dynamic Modulus ◽  
Design Method ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Pavement Design ◽  
Pavement Performance ◽  
Design System ◽  
Determination Method ◽  
Flexible Base

Pavement design adopts the static index pavement design method; it has significant limitations for flexible asphalt pavement. This paper proposes asphalt mixture dynamic modulus determination method on the basis of existing research results at home and abroad. Dynamic modulus effect is studied on the mechanical properties of flexible base asphalt pavement, and the flexible base asphalt pavement performance is preestimated by the use of the dynamic modulus indicators in the paper.

scholarly journals Correction of air freezing index for pavement frost protection design to consider future climate changes

2016 ◽  
Vol 43 (4) ◽  
pp. 312-319 ◽  
Author(s):  
Jean-Pascal Bilodeau ◽  
Guy Doré ◽  
François Perron Drolet ◽  
Diane Chaumont
Keyword(s):  
Climate Change ◽  
Climate Changes ◽  
Flexible Pavement ◽  
Pavement Design ◽  
Future Climate ◽  
Frost Heave ◽  
Pavement Performance ◽  
Deterioration Rate ◽  
Climate Simulations ◽  
Pavement Structures

In cold regions, climate affects flexible pavement performance, such as frost heave. In the context of a changing climate, air freezing index can no longer be considered as fixed for pavement design. Climate simulations were performed for Quebec conditions to determine the evolution of the air freezing index over the coming decades. Using a relationship between average frost heave and the yearly roughness deterioration rate and a proposed method to consider decreasing air freezing index, the effect of climate change was quantified with respect to the 1971–2000 conditions. Thinner pavement structures are obtained with the calculation approach, and its effect was quantified in terms of materials and pavement life. It was shown that a reduction of 100 mm could be considered for pavements built on frost sensitive soils. In addition, the proposed method showed an increase of pavement life, quantified with roughness, for most of the cases considered.

Implementation Initiatives of the Mechanistic–Empirical Pavement Design Guides in Indiana

2005 ◽  
Vol 1919 (1) ◽  
pp. 142-151 ◽  
Author(s):  
Tommy Nantung ◽  
Ghassan Chehab ◽  
Scott Newbolds ◽  
Khaled Galal ◽  
Shuo Li ◽  
...  
Keyword(s):  
Pavement Design ◽  
Sensitivity Analyses ◽  
Pavement Performance ◽  
Design Parameters ◽  
State Highway ◽  
Design Guide ◽  
Input Parameters ◽  
Pavement Structures ◽  
State Highway Agencies ◽  
Empirical Design

The release of the Mechanistic–Empirical Design Guide for New and Rehabilitated Pavement Structures (M-E design guide) generated a new paradigm for designing and analyzing pavement structures. It is expected to replace the commonly used empirical design methodologies. The M-E design guide uses a comprehensive suite of input parameters deemed necessary to design pavements with high reliability and to predict pavement performance and distresses realistically. However, the considerable amount of input needed and the selection of the corresponding reliability level for each might present state highway agencies with complexities and challenges in its implementation. An overview is presented of ongoing investigative studies, sensitivity analyses, and preimplementation initiatives conducted by the Indiana Department of Transportation (INDOT) in an effort to accelerate the adoption of the new pavement design guide by efficiently using existing design parameters and determining those parameters that influence the predicted performance the most. Once the sensitive inputs are identified, the large amount of other required design input parameters can be significantly reduced to a manageable level for implementation purposes. A matrix of trial runs conducted with the M-E design guide software suggests that a higher design level input does not necessarily guarantee a higher accuracy in predicting pavement performance. The software runs also confirmed the need to use input values obtained from local rather than national calibration. Such findings are important for state highway agencies such as INDOT in drafting initiatives for implementing the M-E design guide.

scholarly journals State of the practice in pavement structural design/analysis codes relevant to airfield pavement design

2021 ◽  
Author(s):  
Ernie Heymsfield ◽  
Jeb Tingle
Keyword(s):  
Structural Design ◽  
Pavement Design ◽  
Ambient Conditions ◽  
Element Analysis ◽  
Closed Form Solutions ◽  
Applied Loading ◽  
Live Loads ◽  
Pavement Structure ◽  
Pavement Structures ◽  
Methods Analytical

An airfield pavement structure is designed to support aircraft live loads for a specified pavement design life. Computer codes are available to assist the engineer in designing an airfield pavement structure. Pavement structural design is generally a function of five criteria: the pavement structural configuration, materials, the applied loading, ambient conditions, and how pavement failure is defined. The two typical types of pavement structures, rigid and flexible, provide load support in fundamentally different ways and develop different stress distributions at the pavement – base interface. Airfield pavement structural design is unique due to the large concentrated dynamic loads that a pavement structure endures to support aircraft movements. Aircraft live loads that accompany aircraft movements are characterized in terms of the load magnitude, load area (tire-pavement contact surface), aircraft speed, movement frequency, landing gear configuration, and wheel coverage. The typical methods used for pavement structural design can be categorized into three approaches: empirical methods, analytical (closed-form) solutions, and numerical (finite element analysis) approaches. This article examines computational approaches used for airfield pavement structural design to summarize the state-of-the-practice and to identify opportunities for future advancements. United States and non-U.S. airfield pavement structural codes are reviewed in this article considering their computational methodology and intrinsic qualities.

scholarly journals Design solutions for pavements structure affected by static and impact load

2014 ◽  
Vol 9 (4) ◽  
pp. 269-275 ◽  
Author(s):  
Audrius Vaitkus ◽  
Viktoras Vorobjovas ◽  
Judita Gražulytė ◽  
Rita Kleizienė ◽  
Ovidijus Šernas ◽  
...  
Keyword(s):  
Impact Load ◽  
Climatic Conditions ◽  
Waste Utilization ◽  
Structure Design ◽  
Pavement Performance ◽  
Impact Loads ◽  
Main Factors ◽  
Pavement Structure ◽  
Pavement Structures ◽  
In The Beginning

Pavements of aprons, container and logistic terminals, areas of storage, parking lots, areas of waste utilization are affected by high pressure static and impact loads. These loads strongly influence pavement performance by causing permanent deformations and distresses in the surface and even sometimes pavement failure in the beginning of pavement service. The types of structure, materials and layer thicknesses are the main factors relative to pavement performance. In order to correctly understand the particularity of static and impact loading, distresses of pavement structures affected by such load are emphasized, the load specification and climatic conditions influencing pavement performance are characterized. After analysis of the best practise, the flow chart of pavement structure design model was introduced. The paper gives reasonable pavement type and thickness determination dependent on object of application pavement structure.

Cracks Resisting Mechanism Analysis of Large Stone Mixture Base Based on Mechanics Calculations

2013 ◽  
Vol 723 ◽  
pp. 729-736
Author(s):  
Hong Zhi Li
Keyword(s):  
Temperature Stress ◽  
Coupling Effect ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Element Model ◽  
Stress And Strain ◽  
Mechanism Analysis ◽  
Large Stone ◽  
Pavement Structure ◽  
Pavement Structures

In order to study the cracks resisting mechanism of large stone asphalt mixture base, a multi-layer elastic theory program was used to calculate the loading stress in different pavement structures. Then a Finite Element model was established based on a twinkling heat conduct hypothesis to calculate temperature stress and strain of pavement structure when temperature dropped. Finally, the stress and strain of all the structural layers was calculated considering the coupling effect of loading and temperature. It is found that temperature stress which is caused by temperate quick dropped is far more lager than loading stress cause by standard loading, while considering the co-effect of vehicle loading and temperature quickly dropped. Thus it is revealed that cracking in pavement is mainly caused by temperature quickly dropped. By contrast, it is found that pavement stress and strain caused by loading and temperature of the structure with asphalt macadam mixture (ATB30) base are less than that of the conventional semi-rigid pavement. Finally, an asphalt macadam mixture base applied in asphalt pavement structure is believed to be an efficient way in reducing asphalt pavement cracking.

scholarly journals Efecto de la temperatura en el módulo dinámico del cemento asfáltico y la mezcla asfáltica – caso de Boyacá

Respuestas ◽  
2016 ◽  
Vol 21 (1) ◽  
pp. 108
Author(s):  
Carlos Hernando Higuera-Sandoval
Keyword(s):  
Research Work ◽  
Asphalt Mixture ◽  
Weighted Average ◽  
Road Construction ◽  
Effect Of Temperature ◽  
Operating Characteristics ◽  
The Road ◽  
Pavement Structures ◽  
Dynamic Modules

Objetivo: El presente artículo muestra de manera detallada el efecto de la temperatura en la determinación del módulo dinámico del cemento asfáltico y el módulo dinámico de la mezcla asfáltica. Metodología: Para la investigación se consideraron las temperaturas medias anuales ponderadas más representativas de las regiones del departamento de Boyacá de 13°C a 20°C, también la velocidad de operación de sus carreteras de 30, 50, 70 y 100 Km/hora y se analizaron dos cementos asfálticos del tipo AC 60 – 70 y AC 80 – 100, estipulados en el artículo INV 400-13 de las especificaciones generales de construcción de carreteras del Instituto Nacional de Vías – INVIAS - 2013 y que son de uso frecuente en la construcción de pavimentos en el departamento de Boyacá. Para la determinación de los módulos dinámicos del asfalto y de la mezcla asfáltica se siguió la metodología de la SHELL y se analizaron las variables como la temperatura media anual ponderada del aire – TMAP, la temperatura de trabajo de la mezclas – tmix, la velocidad de operación de las carreteras – Vop, el tiempo de aplicación de la carga – t, la frecuencia de la aplicación de la carga – F y el índice de penetración del asfalto – IP. Resultados: Se presentan los módulos dinámicos del asfalto y de la mezcla asfáltica para diferentes temperaturas medias anuales ponderadas y diferentes velocidades de operación de las carreteras del Departamento de Boyacá, para los asfaltos tipo AC 60-70 y AC 80-100. Conclusión: El aporte de este trabajo de investigación es de gran utilidad para los ingenieros de diseño de estructuras de pavimentos, porque permite conocer el módulo dinámico de una mezcla asfáltica densa en caliente tipo INVIAS MDC-19 para rodadura, teniendo en cuenta la temperatura media anual ponderada de la zona del proyecto y las características de operación de la carretera, variables fundamentales para el diseño de las estructuras de pavimento flexible.Abstract Objective: This article shows in detail the effect of temperature on the determination of the dynamic module of asphaltic cement and the dynamic module of the asphalt mix. Method: Average pondered annual temperatures of the most representative Regions of the department of Boyaca ranging 13 ° C to 20 ° C were considered, as well as the speed of operation of its highways 30, 50, 70 and 100 km / hour and were considered, and two asphalt cements the type AC 60 - 70 and AC 80 – 100 which are stipulated in the article INV 400-13 of the general speciications for road construction of the National roads Institute - INVIAS - 2013 of frequent use in the pavement construction in the department of Boyaca. For the determination of the dynamic modules of asphalt and asphalt mixture the methodology SHELL was followed and variables as the weighted average annual air temperature TMAP, temperature Working Mixtures - TMIX, Speed Operation of roads - VOP, the application time load - t, the frequency of application of the load - F and the rate of penetration asphalt - IP were analyzed. Results: Dynamic modules asphalt and asphalt mixture paragraph for different annual pondered average temperatures and different speeds of operation of the roads on the Department of Boyaca are presented, for asphalts type AC 60-70 and AC 80-100. Conclusion: The contribution of this research work is very useful for Design Engineers of pavement structures as it allows to know the dynamic module of a hot-dense asphalt mixture of the type INVIAS MDC-19 for rolling, taking into account the annual pondered average temperature of the project area and the operating characteristics of the road, fundamental variables for the design of lexible pavement structures.Palabras clave: Diseño de pavimentos lexibles, mecánica de pavimentos, mezclas asfálticas, módulos dinámicos

Sign in / Sign up

Export Citation Format

Share Document