scholarly journals Evaluation and Validation of Characterization Methods for Fatigue Performance of Asphalt Mixes for Western Australia

2013 ◽  
Vol 723 ◽  
pp. 75-85 ◽  
Author(s):  
Ainalem Nega ◽  
Hamid Nikraz ◽  
Colin Leek ◽  
Behzad Ghadimi
Keyword(s):  
Western Australia ◽  
Tensile Modulus ◽  
Fatigue Performance ◽  
Pavement Performance ◽  
Aggregate Gradation ◽  
Asphalt Mixes ◽  
Characterization Methods ◽  
The Road ◽  
Asphalt Mix ◽  
Study Laboratory

The determination of appropriate pavement thickness using laboratory determined parameters is one of the key issues facing the road manager. Five different types of asphalt mixes were produced in laboratory to modify pavement performance mixture. The main objective of this study is to evaluate the characterization methods for fatigue performance of asphalt mixes to Western Australia road. In this study, laboratory test for indirect tensile modulus, dynamic creep, wheel tracking and aggregate gradation tests were taken to analyze each asphalt mixtures for a design traffic road. The results and analysis showed that AC20-75 asphalt mix blow is the most effective and efficient in pavement performance than the other asphalt mixes. AC14-75 was the second in rank to strengthen and durability of asphalt pavement. All asphalt mixes in this study can be used to strength and stable the overall stiffness of pavement, and modification rank can be described as AC20-75 Blow > AC14-75 Blow > AC14-50 Blow > AC7-50 Blow > SMA7-50 Blow in this research.

scholarly journals Pavement Materials Characterization of Hot-Mix Asphalt Mixes in Western Australia

2013 ◽  
Vol 723 ◽  
pp. 434-443 ◽  
Author(s):  
Ainalem Nega ◽  
Hamid Nikraz ◽  
Colin Leek ◽  
Behzad Ghadimi
Keyword(s):  
Western Australia ◽  
Resilient Modulus ◽  
Materials Characterization ◽  
Pavement Performance ◽  
Main Role ◽  
Asphalt Mixes ◽  
Air Voids ◽  
Pavement Materials ◽  
Wheel Tracking ◽  
Study Laboratory

The use of deep strength asphalt materials characterization to construct and restore the heavily urban roads where damage has been induced is rapidly grown in Western Australia. Five different types of asphalt mixes were produced in laboratory to modify pavement performance mixture. The main role of this research is to evaluate the pavement materials characterization for Western Australia road. In this study, laboratory test for tensile strength, resilient modulus, wheel tracking, binder contents, Marshall Compaction, and air voids contents test were taken to analyze each asphalt mixtures. The results indicated that AC20-75 and AC14-75 asphalt mixes blow were in a good pavement performance as compared to other asphalt mixes. For a mix design purposed, all the asphalt mixes that are used in this study can strength and stable the stiffness of pavement that is notable, and the modification effect rank can be described as AC20-75 Blow > AC14-75 Blow > AC14-50 Blow > AC7-50 Blow > SMA7-50 Blow in this research.

Effect of Increasing Sasobit on Permanent Deformation and Moisture Damage of Asphalt Mixes

2018 ◽  
Vol 877 ◽  
pp. 241-247 ◽  
Author(s):  
Fazal Haq ◽  
Arshad Hussain ◽  
Kamran Mushtaq
Keyword(s):  
Transportation Network ◽  
Permanent Deformation ◽  
Road Construction ◽  
Cost Effective ◽  
Moisture Damage ◽  
Moisture Susceptibility ◽  
Asphalt Mixes ◽  
The Road ◽  
Asphalt Mix ◽  
The Impact

Transportation network plays a substantial role in the everyday life of social beings. The preservation of this vast infrastructure needs appropriate and cost-effective design techniques, which depends upon the selection and proportion of binder and aggregate. With the passage of time, as compared to HMA (Hot Mix Asphalt), WMA (Warm mix asphalt) has become extreme prevalent in the road construction industry, because WMA offers the opportunity of production asphalt mix at a reduced temperature than conventionally used for HMA, hence saving energy, cutting CO2 emission and improve environmental quality. This study aims to assess the impact of sasobit (an organic WMA additive) on permanent deformation and moisture susceptibility of asphalt mixes. Under the scope of this paper, the authors have added three percentages of sasobit that is 1%, 2% and 3% to check the effect of increasing sasobit percentage on rutting and moisture damage of asphalt mixes. In summary, rut depth of WMA as obtained from Hamburg Wheel Tracker Device (HWTD) slightly decreased from that of HMA, while rut depth at 1% and 2% was even less than that of 3% sasobit. A slight increase in moisture damage as compared to control mix was observed by adding sasobit, as illustrated by decreased Tensile Strength Ratios TSR.

scholarly journals IMPACT OF MODIFICATED ASPHALT MIXTURES ON PAVING FUNCTIONING AND ENVIRONMENT / MODIFIKUOTŲ ASFALTBETONIO MIŠINIŲ POVEIKIS DANGOS FUKNCIONAVIMUI IR APLINKAI

2016 ◽  
Vol 8 (4) ◽  
pp. 418-424
Author(s):  
Gediminas Gribulis ◽  
Donatas Čygas ◽  
Audrius Vaitkus
Keyword(s):  
Carbon Dioxide ◽  
Industrial Development ◽  
Asphalt Mixtures ◽  
Asphalt Mixes ◽  
The Road ◽  
Advantages And Disadvantages ◽  
The World ◽  
Asphalt Mix ◽  
On The Road ◽  
Road Paving

Atmospheric pollution began to increase in the beginning of 19th century, when the global economy and industrial development started the signal grow. The current problem of global warming is partly related with emission of carbon dioxide (CO2) to environment, which one of the sources are industrial production companies. Warm asphalt mix is usually used in the practice of Lithuania and the world for equipment of road paving. These mixes are produced in specialized asphalt mixers where stone dosing, drying and its mixing with bituminous binders are performed. The temperature of produced hot asphalt mix in mixer reach 150–180 °C and 120–160 °C of mixture laying on the road. Various pollutants, carbon dioxide, formaldehydes, and other are spread to the environment. The carried out researches in Lithuania and the world have showed that while using special additives it is possible to reduce the temperatures of warm asphalt production and laying on the road. Such reduction of temperature helps not to worsen the quality of asphalt layer, to lower the emission of pollutants to environment, to improve the conditions of road workers and to economically use the gas for production of asphalt mixes. Production technologies of different asphalt mixes, their advantages and disadvantages, and results of laboratory tests are analyzed in this article. Equipment samples of experimental road sections, using the warm mixing asphalt mixtures are given. 19 amžiaus pradžioje, ėmus sparčiai augti pasaulinei ekonomikai ir vystytis pramonei, pradėjo didėti ir atmosferos užterštumas. Dabartinė globalinė pasaulinio atšilimo problema iš dalies siejama su anglies dioksido (CO2) išmetimu į aplinką, kurio vienas iš šaltinių yra pramoninės gamybos įmonės. Automobilių kelių dangoms įrengti Lietuvos ir pasaulinėje praktikoje dažniausiai naudojami karšto asfalto mišiniai. Šie mišiniai yra gaminami specialiuose asfalto maišytuvuose, kuriuose akmens medžiagos dozuojamos, džiovinamos, maišomos su bituminiais rišikliais. Gaminamo karšto asfalto mišinio temperatūra maišytuve siekia 150–180 oC, o kelyje klojamo – 120–160 oC. Šių procesų metu į aplinką paskleidžiama įvairių teršalų: anglies dioksido, formaldehidų ir kt. Pasaulyje ir Lietuvoje atlikti moksliniai tyrimai parodė, kad naudojant specialius priedus galima sumažinti karštų asfalto mišinių gamybos bei klojimo kelyje temperatūrą. Toks temperatūros sumažinimas leidžia nepabloginti asfalto dangų kokybės, sumažinti teršalų išmetimą į aplinką, pagerinti kelyje dirbančių darbuotojų darbo sąlygas, ekonomiškiau naudoti asfalto mišinių gamybai reikalingas dujas. Šiame straipsnyje analizuojamos skirtingų asfalto mišinių gamybos technologijos, jų privalumai ir trūkumai, laboratorinių bandymų rezultatai. Pateikiami eksperimentinių kelių ruožų įrengimo pavyzdžiai, naudojant šiltojo maišymo asfalto mišinius.

scholarly journals Evaluation of the Impact of Asphalt Mix Segregation on Pavement Performance

2019 ◽  
Vol 2673 (1) ◽  
pp. 310-316 ◽  
Author(s):  
Ohhoon Kwon ◽  
Bouzid Choubane ◽  
David Hernando ◽  
Wayne Allick
Keyword(s):  
Laboratory Tests ◽  
Pavement Performance ◽  
Department Of Transportation ◽  
Accelerated Pavement Testing ◽  
Aggregate Gradation ◽  
Florida Department ◽  
Asphalt Mix ◽  
Pavement Testing ◽  
Scale Experiment ◽  
The Impact

A full-scale experiment was conducted at the Florida Department of Transportation (FDOT)’s accelerated pavement testing (APT) facility to evaluate the impact of segregation on hot mix asphalt (HMA) pavement performance. Localized areas of segregation were artificially generated during the construction of the APT test tracks, using improper paving techniques without any manipulation of the aggregate gradation. The subsequent APT results showed that, under similarly controlled conditions, the segregated locations exhibited significantly higher rutting than the non-segregated areas. Furthermore, supplementary field and laboratory tests indicated that the segregated locations had, in comparison, greater cracking, raveling, and tire-pavement interaction noise potentials.

scholarly journals Prediction of the optimum asphalt content using artificial neural networks

10.30544/579 ◽  
2021 ◽  
Author(s):  
Kareem Mohamed Mousa Othman ◽  
Hassan Abdelwahab
Keyword(s):  
Mix Design ◽  
Average Error ◽  
Aggregate Gradation ◽  
Asphalt Mixes ◽  
New Approach ◽  
Marshall Test ◽  
Asphalt Mix ◽  
Asphalt Content ◽  
Artificial Neural ◽  
Artificial Neural Network Ann

The performance of the asphalt mix is significantly influenced by the optimum asphalt content (OAC). The asphalt content is responsible for coating the aggregate surface and filling the voids between the aggregate particles. Thus, the aggregate gradation has a significant influence on the required asphalt content. The Marshall design process is the most common method used for estimating the OAC, and this process is called the asphalt mix design. However, this method is time consuming, labor intensive, and its results are subjected to variations. Thus, this paper employs the artificial neural network (ANN) to estimate the OAC from the aggregate gradation for the two most common gradations used in asphalt mixes in Egypt (3D, 4C). Results show that the proposed ANN can predict the OAC with a coefficient of correlation of 0.98 and an average error of 0.026%. As a result, a new approach for the Marshall test can be adopted using results of the proposed ANN, and only three specimens, instead of fifteen, are prepared and tested for estimating the remaining parameters. This approach saves the time, effort, and resources required for estimating the OAC. Additionally, the ANN was validated with previously developed models, and the ANN shows promising results.

Laboratory Assessment of Workability of Asphalt Rubber Hot Mixes Using Warm Mix Technology

2012 ◽  
Vol 193-194 ◽  
pp. 452-457 ◽  
Author(s):  
Meng Yun Huang ◽  
Jing Hui Liu ◽  
Xi Zhang ◽  
Dan Ni Li
Keyword(s):  
Asphalt Binder ◽  
Asphalt Mixture ◽  
Crumb Rubber ◽  
Laboratory Assessment ◽  
Asphalt Mixes ◽  
Modified Asphalt ◽  
The Road ◽  
Asphalt Rubber ◽  
Synergy Effects ◽  
Save Energy

Using the waste crumb rubber modified asphalt to pave the road surface could reduce cost and save energy. However，in order to obtain adequate workability, the mixing temperature and compaction temperature of rubberized asphalt binder and its mixture is much higher than those of conventional asphalt mixtures. Warm Mix Asphalt (WMA) is the name given to certain technologies that reduce the production and placement temperatures of asphalt mixes. One of the main benefits advertised is the increased workability at conventional and lower compaction temperatures with the WMA addition. This paper evaluates whether there are any synergy effects of using warm mix technologies and Asphalt Rubber(AR) hot mixes. This paper summarizes a lab research to evaluate the workability of Asphalt Rubber hot mixes containing warm mix technologies. Both asphalt binder and asphalt mixture were evaluated and compared. The research suggests that combining WMA technology with Asphalt Rubber mixtures is a win-win.

Aggregate gradation theory, design and its impact on asphalt pavement performance: a review

2018 ◽  
Vol 20 (12) ◽  
pp. 1408-1424 ◽  
Author(s):  
Mingjing Fang ◽  
Daewook Park ◽  
Jean Louis Singuranayo ◽  
Hao Chen ◽  
Yueguang Li
Keyword(s):  
Asphalt Pavement ◽  
Pavement Performance ◽  
Aggregate Gradation

Evaluation of Fatigue Life of Asphalt Concrete From Dynamic Modulus Test

2017 ◽  
Author(s):  
Md Mehedi Hasan ◽  
Hasan M. Faisal ◽  
Biswajit K. Bairgi ◽  
A. S. M. Rahman ◽  
Rafiqul Tarefder
Keyword(s):  
Fatigue Life ◽  
Asphalt Concrete ◽  
Dynamic Modulus ◽  
Performance Testing ◽  
Fatigue Performance ◽  
Construction Sites ◽  
Reclaimed Asphalt ◽  
Wide Range ◽  
Dynamic Modulus Test ◽  
Study Laboratory

Asphalt concrete’s dynamic modulus (|E*|) is one of the key input parameters for structural design of flexible pavement according to the Mechanistic Empirical Pavement Design Guide (MEPDG). Till this day, pavement industry uses |E*| to predict pavement performance whether the material is hot mix asphalt (HMA) or warm mx asphalt or Reclaimed Asphalt Pavement (RAP) mixed HMA. However, it is necessary to investigate the correlation of |E*| with laboratory performance testing. In this study, laboratory dynamic modulus test was conducted on four different asphalt concrete mixtures collected from different construction sites in the state of New Mexico and mastercurves were obtained to evaluate dynamic modulus (|E*|) for a wide range of frequency. In addition, fatigue performance of these mixtures was predicted from the mastercurves and compared with the laboratory fatigue performance testing. Fatigue performance of these mixtures was evaluated from the four point beam fatigue test. The laboratory results show a good agreement with the predicted value from mastercurves. It is also observed from this study that the fatigue life of the asphalt concrete materials decreases with increase in |E*| value.

scholarly journals A Method to Quantify Reclaimed Asphalt Pavement Binder Availability (Effective RAP Binder) in Recycled Asphalt Mixes

2019 ◽  
Vol 2673 (1) ◽  
pp. 205-216 ◽  
Author(s):  
Fawaz Kaseer ◽  
Edith Arámbula-Mercado ◽  
Amy Epps Martin
Keyword(s):  
Asphalt Pavement ◽  
Economic Benefits ◽  
Binder Content ◽  
Mix Design ◽  
Void Content ◽  
Reclaimed Asphalt Pavement ◽  
Asphalt Mixes ◽  
Reclaimed Asphalt ◽  
State Highway ◽  
Asphalt Mix

State highway agencies recognize the environmental and economic benefits of utilizing reclaimed asphalt pavement (RAP) in asphalt mixes. Currently, most agencies assume all of the RAP binder content is available for mix design purposes. However, the percentage of available or effective RAP binder in the asphalt mix is usually less than 100% and not quantified, which could yield dry asphalt mix with a high air void content, potentially leading to premature distress. The term available or effective RAP binder refers to the binder that is released from the RAP, becomes fluid, and blends with virgin binder under typical mixing temperatures. This study proposes a method to estimate the RAP binder availability factor (BAF) which can be used to adjust the virgin binder content in RAP mixes to ensure that the mix design optimum binder content is achieved. In this method, asphalt mixes were prepared so that, after mixing and conditioning, the RAP material can be separated from the virgin aggregate, which allows for a thorough evaluation of the extent of RAP binder availability in the asphalt mix. This method was verified in a preliminary experiment and then used to estimate the BAF of RAP from different sources, and a correlation between RAP BAF and the high temperature performance grade (PG) of each RAP source was established. Finally, factors affecting the RAP BAF were also evaluated such as mixing temperature, conditioning period, the use of recycling agents (or rejuvenators), and the method of adding the recycling agent to the mix.

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