TY  - JOUR
AU  - Orešković, Marko
AU  - Bohuš, Štepan
AU  - Virgili, Amadeo
AU  - Canestrari, Francesco
PY  - 2024
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/3462
AB  - Fatigue analysis has an important role in evaluating the durability and performance of asphalt pavements, especially when novel or alternative materials are used. Numerous laboratory studies have investigated fatigue performance with the aim of estimating field behavior as accurately as feasible. Therefore, there are currently many different test methods and data analysis approaches that can be used. One of the most common laboratory test methods is the four-point bending beam (4PBB) test, which results are usually analyzed using the so-called traditional (where 50% reduction in initial stiffness is considered as failure criterion) or the energy ratio (ER) approach. However, outcomes from previous studies have shown that these approaches may not be appropriate and reliable if geogrids are used as a reinforcement. As a possible solution, this study proposes a new simplified flex point (SFP) approach that considers the flex point of the strain amplitude curve, measured during 4PBB fatigue tests, to calculate the number of cycles to failure. These three approaches were applied to four double-layered asphalt sets: one unreinforced and three reinforced with geogrids of different strength (50 x 50, 100 x 100 and 100 x 200 kN/m). The impact of reinforcement on the fatigue life was evaluated by comparing the critical strain values (ε6) of reinforced and unreinforced sets through the fatigue resistance improvement factor. The research findings showed that the use of geogrids improves fatigue life when the SFP and ER approaches are applied and that the traditional approach might not always be appropriate for assessing the fatigue resistance of reinforced asphalt mixtures.
PB  - Springer
T2  - Materials and Structures
T1  - Simplified methodology for fatigue analysis of reinforced asphalt systems
IS  - 34
VL  - 57
DO  - 10.1617/s11527-024-02305-1
ER  - 

@article{
author = "Orešković, Marko and Bohuš, Štepan and Virgili, Amadeo and Canestrari, Francesco",
year = "2024",
abstract = "Fatigue analysis has an important role in evaluating the durability and performance of asphalt pavements, especially when novel or alternative materials are used. Numerous laboratory studies have investigated fatigue performance with the aim of estimating field behavior as accurately as feasible. Therefore, there are currently many different test methods and data analysis approaches that can be used. One of the most common laboratory test methods is the four-point bending beam (4PBB) test, which results are usually analyzed using the so-called traditional (where 50% reduction in initial stiffness is considered as failure criterion) or the energy ratio (ER) approach. However, outcomes from previous studies have shown that these approaches may not be appropriate and reliable if geogrids are used as a reinforcement. As a possible solution, this study proposes a new simplified flex point (SFP) approach that considers the flex point of the strain amplitude curve, measured during 4PBB fatigue tests, to calculate the number of cycles to failure. These three approaches were applied to four double-layered asphalt sets: one unreinforced and three reinforced with geogrids of different strength (50 x 50, 100 x 100 and 100 x 200 kN/m). The impact of reinforcement on the fatigue life was evaluated by comparing the critical strain values (ε6) of reinforced and unreinforced sets through the fatigue resistance improvement factor. The research findings showed that the use of geogrids improves fatigue life when the SFP and ER approaches are applied and that the traditional approach might not always be appropriate for assessing the fatigue resistance of reinforced asphalt mixtures.",
publisher = "Springer",
journal = "Materials and Structures",
title = "Simplified methodology for fatigue analysis of reinforced asphalt systems",
number = "34",
volume = "57",
doi = "10.1617/s11527-024-02305-1"
}

Orešković, M., Bohuš, Š., Virgili, A.,& Canestrari, F.. (2024). Simplified methodology for fatigue analysis of reinforced asphalt systems. in Materials and Structures
Springer., 57(34).
https://doi.org/10.1617/s11527-024-02305-1

Orešković M, Bohuš Š, Virgili A, Canestrari F. Simplified methodology for fatigue analysis of reinforced asphalt systems. in Materials and Structures. 2024;57(34).
doi:10.1617/s11527-024-02305-1 .

Orešković, Marko, Bohuš, Štepan, Virgili, Amadeo, Canestrari, Francesco, "Simplified methodology for fatigue analysis of reinforced asphalt systems" in Materials and Structures, 57, no. 34 (2024),
https://doi.org/10.1617/s11527-024-02305-1 . .

TY  - CONF
AU  - Orešković, Marko
AU  - Trifunović, Stefan
AU  - Mladenović, Goran
AU  - Bohuš, Štepan
PY  - 2019
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1731
AB  - This paper presents an experimental study of the influence of a reinforcement system on fatigue resistance of asphalt concrete. For purpose of this research, unreinforced and grid-reinforced asphalt specimens were tested. Both groups of specimens were manufactured using non-standard method. A 1-ton roller had been used to prepare two-layered slabs with total height of 70 mm. Further, slabs were sawed to obtain beams 6 cm wide and 400 mm long. The total height of each beam was 50 mm, including 20 mm of the bottom layer and 30 mm of the upper layer. The reinforced specimens contained self-adhesive geosynthetic grid between layers. The four point bending beam test, according to EN 12697-24:2012, was used for fatigue testing, while results were analyzed using various failure criteria. The experiment helped to quantify the extension of fatigue life that can be obtained by reinforcement, depending on the selected testing conditions and fatigue criteria.
PB  - CRC Press/Balkema
C3  - Bituminous Mixtures and Pavements VII: Proceedings of the 7th International Conference on Bituminous Mixtures and Pavements
T1  - Fatigue Resistance of a Grid-Reinforced Asphalt Concrete using Four Point Bending Beam Test
EP  - 594
SP  - 589
DO  - 10.1201/9781351063265-79
ER  - 

@conference{
author = "Orešković, Marko and Trifunović, Stefan and Mladenović, Goran and Bohuš, Štepan",
year = "2019",
abstract = "This paper presents an experimental study of the influence of a reinforcement system on fatigue resistance of asphalt concrete. For purpose of this research, unreinforced and grid-reinforced asphalt specimens were tested. Both groups of specimens were manufactured using non-standard method. A 1-ton roller had been used to prepare two-layered slabs with total height of 70 mm. Further, slabs were sawed to obtain beams 6 cm wide and 400 mm long. The total height of each beam was 50 mm, including 20 mm of the bottom layer and 30 mm of the upper layer. The reinforced specimens contained self-adhesive geosynthetic grid between layers. The four point bending beam test, according to EN 12697-24:2012, was used for fatigue testing, while results were analyzed using various failure criteria. The experiment helped to quantify the extension of fatigue life that can be obtained by reinforcement, depending on the selected testing conditions and fatigue criteria.",
publisher = "CRC Press/Balkema",
journal = "Bituminous Mixtures and Pavements VII: Proceedings of the 7th International Conference on Bituminous Mixtures and Pavements",
title = "Fatigue Resistance of a Grid-Reinforced Asphalt Concrete using Four Point Bending Beam Test",
pages = "594-589",
doi = "10.1201/9781351063265-79"
}

Orešković, M., Trifunović, S., Mladenović, G.,& Bohuš, Š.. (2019). Fatigue Resistance of a Grid-Reinforced Asphalt Concrete using Four Point Bending Beam Test. in Bituminous Mixtures and Pavements VII: Proceedings of the 7th International Conference on Bituminous Mixtures and Pavements
CRC Press/Balkema., 589-594.
https://doi.org/10.1201/9781351063265-79

Orešković M, Trifunović S, Mladenović G, Bohuš Š. Fatigue Resistance of a Grid-Reinforced Asphalt Concrete using Four Point Bending Beam Test. in Bituminous Mixtures and Pavements VII: Proceedings of the 7th International Conference on Bituminous Mixtures and Pavements. 2019;:589-594.
doi:10.1201/9781351063265-79 .

Orešković, Marko, Trifunović, Stefan, Mladenović, Goran, Bohuš, Štepan, "Fatigue Resistance of a Grid-Reinforced Asphalt Concrete using Four Point Bending Beam Test" in Bituminous Mixtures and Pavements VII: Proceedings of the 7th International Conference on Bituminous Mixtures and Pavements (2019):589-594,
https://doi.org/10.1201/9781351063265-79 . .

TY  - JOUR
AU  - Oreskovic, Marko
AU  - Trifunović, Stefan
AU  - Mladenović, Goran
AU  - Bohuš, Štepan
PY  - 2018
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1922
AB  - Флексибилне коловозне конструкције су подложне појави пукотина услед замора и термичких утицаја, а значајан проблем представља и појава рефлектованих пукотина код полукрутих коловозних конструкција или код крутих које су пресвучене слојевима асфалта. Армирањем асфалтних слојева применом геомрежа, могуће је значајно успорити, ако не и спречити појаву пукотина. У оквиру овог рада приказани су резултати експерименталног истраживања чији је циљ био да се утврди утицај примене геомреже на отпорност асфалт бетона на замор. Испитана су два двослојна сета узорака, са и без геомреже (ојачани и неојачани). Испитне гредице су исечене из плоча које су припремљене нестандардном методом, употребом ваљка од једне тоне. Дебљина доњег слоја асфалта у гредицама је била 20 mm, дебљина горњег слоја 30 mm, ширина 60 mm и дужина 400 mm. Ојачани узорци садржали су самолепљиву геосинтетичку мрежу велике чврстоће између слојева. Испитивање отпорности асфaлтних мешавина на замор спроведено је опитом савијања гредица у четири тачке, док су за анализу резултата исптивања коришћена два критеријума за дефинисање замора. Истраживање је помогло да се процени продужетак века на замор применом геомрежа у зависности од примењеног критеријума за дефинисање замора.
AB  - Flexible pavement structures are prone to cracking due to the fatigue and thermal influence, while a significant problem presents the appearance of reflective cracking in semi-rigid pavement structures or in rigid pavements overlaid with asphalt concrete. Reinforcement of asphalt concrete by using geogrids substantially slow down, if not stop crack propagation. The paper presents the results of an experimental study aimed at determining the influence of geogrid application on the fatigue resistance of asphalt concrete. Two double layered sets of specimens, with and without a grid, were tested (reinforced and unreinforced). Testing beams were cut from the slabs prepared by a non-standard method, using a one-ton roller. The thickness of the bottom layer of asphalt beams was 20 mm, the thickness of the upper layer was 30 mm, the width was 60 mm and the length 400 mm. Reinforced samples contained a high-strength adhesive geosynthetic grid between layers. The testing of fatigue resistance of asphalt mixtures was carried out by application of the four-point bending beam test, while two failure criteria were used to analyze the testing results. Presented research helped to quantify the extension of fatigue life that can be obtained by reinforcement, depending on the fatigue criteria.
PB  - Srpsko društvo za puteve VIA VITA
PB  - Serbian society for roads VIA VITA
T2  - Put i saobraćaj
T1  - Одређивање отпорности на замор асфалтних узорака ојачаних геомрежом применом методе савијања гредица у четири тачке
T1  - Determining of the fatigue resistance of a grid-reinforced asphalt concrete by using four point bending beam test
EP  - 27
IS  - 4
SP  - 21
VL  - 64
DO  - https://doi.org/10.31075/PIS.64.04.03
ER  - 

@article{
author = "Oreskovic, Marko and Trifunović, Stefan and Mladenović, Goran and Bohuš, Štepan",
year = "2018",
abstract = "Флексибилне коловозне конструкције су подложне појави пукотина услед замора и термичких утицаја, а значајан проблем представља и појава рефлектованих пукотина код полукрутих коловозних конструкција или код крутих које су пресвучене слојевима асфалта. Армирањем асфалтних слојева применом геомрежа, могуће је значајно успорити, ако не и спречити појаву пукотина. У оквиру овог рада приказани су резултати експерименталног истраживања чији је циљ био да се утврди утицај примене геомреже на отпорност асфалт бетона на замор. Испитана су два двослојна сета узорака, са и без геомреже (ојачани и неојачани). Испитне гредице су исечене из плоча које су припремљене нестандардном методом, употребом ваљка од једне тоне. Дебљина доњег слоја асфалта у гредицама је била 20 mm, дебљина горњег слоја 30 mm, ширина 60 mm и дужина 400 mm. Ојачани узорци садржали су самолепљиву геосинтетичку мрежу велике чврстоће између слојева. Испитивање отпорности асфaлтних мешавина на замор спроведено је опитом савијања гредица у четири тачке, док су за анализу резултата исптивања коришћена два критеријума за дефинисање замора. Истраживање је помогло да се процени продужетак века на замор применом геомрежа у зависности од примењеног критеријума за дефинисање замора., Flexible pavement structures are prone to cracking due to the fatigue and thermal influence, while a significant problem presents the appearance of reflective cracking in semi-rigid pavement structures or in rigid pavements overlaid with asphalt concrete. Reinforcement of asphalt concrete by using geogrids substantially slow down, if not stop crack propagation. The paper presents the results of an experimental study aimed at determining the influence of geogrid application on the fatigue resistance of asphalt concrete. Two double layered sets of specimens, with and without a grid, were tested (reinforced and unreinforced). Testing beams were cut from the slabs prepared by a non-standard method, using a one-ton roller. The thickness of the bottom layer of asphalt beams was 20 mm, the thickness of the upper layer was 30 mm, the width was 60 mm and the length 400 mm. Reinforced samples contained a high-strength adhesive geosynthetic grid between layers. The testing of fatigue resistance of asphalt mixtures was carried out by application of the four-point bending beam test, while two failure criteria were used to analyze the testing results. Presented research helped to quantify the extension of fatigue life that can be obtained by reinforcement, depending on the fatigue criteria.",
publisher = "Srpsko društvo za puteve VIA VITA, Serbian society for roads VIA VITA",
journal = "Put i saobraćaj",
title = "Одређивање отпорности на замор асфалтних узорака ојачаних геомрежом применом методе савијања гредица у четири тачке, Determining of the fatigue resistance of a grid-reinforced asphalt concrete by using four point bending beam test",
pages = "27-21",
number = "4",
volume = "64",
doi = "https://doi.org/10.31075/PIS.64.04.03"
}

Oreskovic, M., Trifunović, S., Mladenović, G.,& Bohuš, Š.. (2018). Одређивање отпорности на замор асфалтних узорака ојачаних геомрежом применом методе савијања гредица у четири тачке. in Put i saobraćaj
Srpsko društvo za puteve VIA VITA., 64(4), 21-27.
https://doi.org/https://doi.org/10.31075/PIS.64.04.03

Oreskovic M, Trifunović S, Mladenović G, Bohuš Š. Одређивање отпорности на замор асфалтних узорака ојачаних геомрежом применом методе савијања гредица у четири тачке. in Put i saobraćaj. 2018;64(4):21-27.
doi:https://doi.org/10.31075/PIS.64.04.03 .

Oreskovic, Marko, Trifunović, Stefan, Mladenović, Goran, Bohuš, Štepan, "Одређивање отпорности на замор асфалтних узорака ојачаних геомрежом применом методе савијања гредица у четири тачке" in Put i saobraćaj, 64, no. 4 (2018):21-27,
https://doi.org/https://doi.org/10.31075/PIS.64.04.03 . .