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This study presents strengthening effect on the reclaimed hot-mix asphalt concrete associated with the reinforcement of hybrid rod-shaped glass fibers and ball-shaped glass-fiber powder to the mix. The toughening effects of the reinforced mixtures were characterized using indirect tensile, dynamic modulus, and hamburg wheel-tracking tests. The rod-shaped hybrid fibers, coated by the polypropylene resin, consist of the macro dimension of rod-shape glass fiber in 10–15 mm of length and the relatively micro size of the fiber in 4–6 mm of length separately. The ball-shaped glass fiber powder, which was coated by the polyethylene resin, was mixed with the macro and micro rod-shape fibers and the reclaimed hot-mix asphalt concrete. The indirect tensile strength test of the fibrous mixtures resulted in about 1.4 times higher strength than those of the plain mixtures. Lower moisture susceptibility, better performance of dynamic modulus at low and high temperatures and superior rut resistance of the fibrous asphalt mixtures were also observed.
Ki Soo Park; Touqeer Shoukat; Pyeong Jun Yoo; Soo Hyung Lee. Strengthening of hybrid glass fiber reinforced recycled hot-mix asphalt mixtures. Construction and Building Materials 2020, 258, 118947 .
AMA StyleKi Soo Park, Touqeer Shoukat, Pyeong Jun Yoo, Soo Hyung Lee. Strengthening of hybrid glass fiber reinforced recycled hot-mix asphalt mixtures. Construction and Building Materials. 2020; 258 ():118947.
Chicago/Turabian StyleKi Soo Park; Touqeer Shoukat; Pyeong Jun Yoo; Soo Hyung Lee. 2020. "Strengthening of hybrid glass fiber reinforced recycled hot-mix asphalt mixtures." Construction and Building Materials 258, no. : 118947.
The pavement structure tends to shrink under low temperature conditions and cracks will appear upon crossing threshold binder stiffness. Decreasing the binder viscosity at such low temperatures, by introducing additional oil fraction (aromatics and saturates) in asphalt colloidal systems, may result in improved resistance to thermal cracking. A single multi-grade engine oil (5W30) was used in this study to analyze the rheological properties imparted to binders. Rotational Viscosity (RV) test revealed that after Rolling Thin Film Oven (RTFO) aging, fresh oil and waste oil have a similar effect on decreasing the viscosity of binder and construction temperatures, reducing them by 5~8 °C. Fourier Transform Infrared Spectroscopy (FTIR) test results showed an abrupt increase of carbonyl concertation when fresh engine oil was used for rejuvenation while waste engine oil was less susceptible to oxidative aging. Dynamic analysis of modified binders proved that engine oil has better thermal cracking resistance but relaxation ability of binders and rutting resistance was impaired. Filtered waste engine oil resulted in a 35% decrement in the stiffness of binder compared to virgin asphalt after short term aging but upper Performance Grade (PG) was compromised by 1~3 °C with 2.5% oil inclusion. Unfiltered waste engine oil proved to have the least overall performance compared to fresh and filtered waste engine oil.
Touqeer Shoukat; Pyeong Jun Yoo. Rheology of Asphalt Binder Modified with 5W30 Viscosity Grade Waste Engine Oil. Applied Sciences 2018, 8, 1194 .
AMA StyleTouqeer Shoukat, Pyeong Jun Yoo. Rheology of Asphalt Binder Modified with 5W30 Viscosity Grade Waste Engine Oil. Applied Sciences. 2018; 8 (7):1194.
Chicago/Turabian StyleTouqeer Shoukat; Pyeong Jun Yoo. 2018. "Rheology of Asphalt Binder Modified with 5W30 Viscosity Grade Waste Engine Oil." Applied Sciences 8, no. 7: 1194.
Byung-Sik Ohm; Pyeong-Jun Yoo; Sang-Min Ham; Young-Chan Suh. Study on Field Application of Glass Fiber-reinforced Asphalt Mixtures. International Journal of Highway Engineering 2016, 18, 67 -74.
AMA StyleByung-Sik Ohm, Pyeong-Jun Yoo, Sang-Min Ham, Young-Chan Suh. Study on Field Application of Glass Fiber-reinforced Asphalt Mixtures. International Journal of Highway Engineering. 2016; 18 (3):67-74.
Chicago/Turabian StyleByung-Sik Ohm; Pyeong-Jun Yoo; Sang-Min Ham; Young-Chan Suh. 2016. "Study on Field Application of Glass Fiber-reinforced Asphalt Mixtures." International Journal of Highway Engineering 18, no. 3: 67-74.
Jongeun Baek; Pyeong Jun Yoo. Finite Element Analysis for Fracture Resistance of Fiber-reinforced Asphalt Concrete. International Journal of Highway Engineering 2015, 17, 77 -83.
AMA StyleJongeun Baek, Pyeong Jun Yoo. Finite Element Analysis for Fracture Resistance of Fiber-reinforced Asphalt Concrete. International Journal of Highway Engineering. 2015; 17 (3):77-83.
Chicago/Turabian StyleJongeun Baek; Pyeong Jun Yoo. 2015. "Finite Element Analysis for Fracture Resistance of Fiber-reinforced Asphalt Concrete." International Journal of Highway Engineering 17, no. 3: 77-83.
This study investigated the enhanced toughening characteristics of plastic fiber-reinforced hot-mix asphalt (HMA) mixtures in laboratory and field tests. The toughening effects of plastic fiber-reinforced HMA mixtures were characterized using direct tensile loading tests. Adding a small quantity of plastic fibers to HMA was found to significantly increase the mixture's fracture energy, which was calculated using the tensile force-displacement curves. The fracture energy model appeared to be governed by the direct tensile toughening of fiber-reinforced HMA's enhanced fiber bridging effects. The field measurement of the fiber reinforced mixture resulted in at least ten times lower tensile strains than those of the plain HMA at the bottom of HMA. This indicates that the fiber reinforced mixture has a superior field performance than the plain HMA does and can extend overall performance life of the mixtures if adding a small amount of fibers such as 0.4% by the mixture's weight within the context of the fiber developed in this study.
Byung Sik Ohm; Ji Young Choi; Booil Kim; Pyeong Jun Yoo. Laboratory and Field Toughening Characteristics of Fiber Reinforced Hot-Mix Asphalt Mixtures. T&DI Congress 2014 2014, 208 -220.
AMA StyleByung Sik Ohm, Ji Young Choi, Booil Kim, Pyeong Jun Yoo. Laboratory and Field Toughening Characteristics of Fiber Reinforced Hot-Mix Asphalt Mixtures. T&DI Congress 2014. 2014; ():208-220.
Chicago/Turabian StyleByung Sik Ohm; Ji Young Choi; Booil Kim; Pyeong Jun Yoo. 2014. "Laboratory and Field Toughening Characteristics of Fiber Reinforced Hot-Mix Asphalt Mixtures." T&DI Congress 2014 , no. : 208-220.
Recycled plastic fibre-reinforced hot-mix asphalt (HMA) mixtures have better fatigue resistance than plain HMA. The toughening effects of recycled plastic fibre-reinforced HMA were characterised using direct tensile loading tests. Adding a small quantity of recycled plastic fibres to HMA was found to significantly increase the mixture's fracture energy and toughness, which were calculated using the pre- and post-peak stages of tensile force–displacement curves. A theoretical model representing the pre-peak behaviour of fibre-reinforced HMA with direct tension-softening curves for various fibre contents is presented here. The enhanced toughness through post-peak analysis was also observed using toughness indices associated with fibre-bridging effect after the pre-peak composite stress. The pre-peak fracture energy model and post-peak toughness indices appeared to be governed by the direct tensile toughening of fibre-reinforced HMA's enhanced fibre-bridging effects. The pre-peak fracture energy model demonstrates the effect of fibre content on the strain energy density during the pull-out process within the pre-peak composite stress region. The maximum pre-peak fracture energy of a coarse-graded HMA mixed with recycled plastic fibres is achieved at a fibre content of 0.4% of the total weight of the HMA. The increases in the toughness indices within the post-peak composite stress region indicate that the fatigue resistance of fibre-reinforced HMA is at least 30% greater than that of control HMA.
P.J. Yoo; Imad Al-Qadi. Pre- and post-peak toughening behaviours of fibre-reinforced hot-mix asphalt mixtures. International Journal of Pavement Engineering 2013, 15, 122 -132.
AMA StyleP.J. Yoo, Imad Al-Qadi. Pre- and post-peak toughening behaviours of fibre-reinforced hot-mix asphalt mixtures. International Journal of Pavement Engineering. 2013; 15 (2):122-132.
Chicago/Turabian StyleP.J. Yoo; Imad Al-Qadi. 2013. "Pre- and post-peak toughening behaviours of fibre-reinforced hot-mix asphalt mixtures." International Journal of Pavement Engineering 15, no. 2: 122-132.
Tae-Young Yun; Byung-Sik Ohm; Pyeong-Jun Yoo; Yeon-Bok Kim. A Viscoplastic Constitutive Model Based on Overstress Concept with Time-Temperature Superposition Principle. International Journal of Highway Engineering 2012, 14, 75 -83.
AMA StyleTae-Young Yun, Byung-Sik Ohm, Pyeong-Jun Yoo, Yeon-Bok Kim. A Viscoplastic Constitutive Model Based on Overstress Concept with Time-Temperature Superposition Principle. International Journal of Highway Engineering. 2012; 14 (5):75-83.
Chicago/Turabian StyleTae-Young Yun; Byung-Sik Ohm; Pyeong-Jun Yoo; Yeon-Bok Kim. 2012. "A Viscoplastic Constitutive Model Based on Overstress Concept with Time-Temperature Superposition Principle." International Journal of Highway Engineering 14, no. 5: 75-83.
Tae-Young Yun; Byung-Sik Ohm; Pyeong-Jun Yoo. Performance Evaluation of Polymer Modified Asphalt Binder with PG Testing Protocols. International Journal of Highway Engineering 2012, 14, 47 -55.
AMA StyleTae-Young Yun, Byung-Sik Ohm, Pyeong-Jun Yoo. Performance Evaluation of Polymer Modified Asphalt Binder with PG Testing Protocols. International Journal of Highway Engineering. 2012; 14 (5):47-55.
Chicago/Turabian StyleTae-Young Yun; Byung-Sik Ohm; Pyeong-Jun Yoo. 2012. "Performance Evaluation of Polymer Modified Asphalt Binder with PG Testing Protocols." International Journal of Highway Engineering 14, no. 5: 47-55.
Chang-Joon Lee; Pyeong-Jun Yoo; Ji-Young Choi; Byung-Sik Ohm. Development of Viscoelastic Finite Element Analysis Code for Pavement Structures. International Journal of Highway Engineering 2012, 14, 1 -9.
AMA StyleChang-Joon Lee, Pyeong-Jun Yoo, Ji-Young Choi, Byung-Sik Ohm. Development of Viscoelastic Finite Element Analysis Code for Pavement Structures. International Journal of Highway Engineering. 2012; 14 (5):1-9.
Chicago/Turabian StyleChang-Joon Lee; Pyeong-Jun Yoo; Ji-Young Choi; Byung-Sik Ohm. 2012. "Development of Viscoelastic Finite Element Analysis Code for Pavement Structures." International Journal of Highway Engineering 14, no. 5: 1-9.
With the performance limitation of a conventional hot-mix asphalt mixture, the structural integrity of that is highly needed to be enhanced to increase the fatigue life of the mixture. Various geosynthetic alternatives have been widely utilized, such as geogrid, geotextile, or geomembrane layers at the bottom the mixture or on the top of a subgrade to improve the structural integrity of a hot-mix asphalt pavement system. Although reinforcing effects of such interlayers has been reported with some improvements in hot-mix asphalt pavements’ performances, such as mitigating rut or delaying reflective cracks; however, such alternatives do not enhance toughness, tensile strength, or shear strength of the hot-mix asphalt mixture itself due to that the interlayers are usually installed in between two layers in a pavement system and those interlayers do not mix with hot-mix asphalt mixtures. A new plastic fiber-reinforced hot-mix asphalt mixture was proposed in this study to provide more enhanced structural integrity of the mixture not only at the bottom of the mixture but also within the mixture. The developed mixture in this study led to significant enhancements in phenomenological toughness and fatigue life of that at least 1.5 times higher than those for conventional hot-mix asphalt mixtures as resulting from indirect cyclic fatigue tests in loading-control modes and four-point bending beam tests in displacement-control modes.
Pyeong Jun Yoo; Byung Sik Ohm; Ji Young Choi. Toughening characteristics of plastic fiber-reinforced hot-mix asphalt mixtures. KSCE Journal of Civil Engineering 2012, 16, 751 -758.
AMA StylePyeong Jun Yoo, Byung Sik Ohm, Ji Young Choi. Toughening characteristics of plastic fiber-reinforced hot-mix asphalt mixtures. KSCE Journal of Civil Engineering. 2012; 16 (5):751-758.
Chicago/Turabian StylePyeong Jun Yoo; Byung Sik Ohm; Ji Young Choi. 2012. "Toughening characteristics of plastic fiber-reinforced hot-mix asphalt mixtures." KSCE Journal of Civil Engineering 16, no. 5: 751-758.
With premature deteriorations and performance limitations of hot-mix asphalt (HMA) pavements, innovative solutions are needed to enhance fatigue life or rut-resistance of HMA. Various reinforcing methods are widely utilized such as installing geogrid, geocomposite, or geomembrane layers at the bottom HMA to improve the structural integrity of HMA pavement. Such layered systems sometime improve the field performance of HMA; however, such solutions may not enhance toughness, tensile strength, or shear strength of HMA itself due to the location of interlayer systems. A new mono-strand fiber reinforcing material for HMA is proposed in this study to effectively reinforce the HMA not only at the bottom but also inner-side. Adding a small amount of fiber into HMA leads to significant increases in the phenomenological fatigue life of fiber-reinforced HMA compared to the conventional HMA, and four-point bending beam and indirect tensile tests are performed to observe the effect of fiber reinforcement.
Pyeong Jun Yoo; Ji Young Choi; Byung-Sik Ohm. Characteristics of Mono-Strand Fiber-Reinforced Hot-Mix Asphalt Mixtures. Transportation and Development Institute Congress 2011 2011, 449 -461.
AMA StylePyeong Jun Yoo, Ji Young Choi, Byung-Sik Ohm. Characteristics of Mono-Strand Fiber-Reinforced Hot-Mix Asphalt Mixtures. Transportation and Development Institute Congress 2011. 2011; ():449-461.
Chicago/Turabian StylePyeong Jun Yoo; Ji Young Choi; Byung-Sik Ohm. 2011. "Characteristics of Mono-Strand Fiber-Reinforced Hot-Mix Asphalt Mixtures." Transportation and Development Institute Congress 2011 , no. : 449-461.
The objective of this study is to characterize the creep behavior of hot-mix asphalt (HMA) at intermediate (20°C) and at high temperatures (40°C) . To accomplish this objective, a nonlinear time-hardening creep model, characterized through laboratory testing, was incorporated into a three-dimensional (3D) finite-element (FE) model, which was used to calculate permanent creep strains after applying repetitive vehicular loading cycles at the pavement surface. Two different tire configurations were simulated representing a typical dual-tire assembly and a newly introduced wide-base tire (dual-tire: 275/80R22.5 and wide-base tire: 455/55R22.5). Results of the 3D FE model were successfully verified against pavement response measurements in the field at the Virginia Smart Road. While the elastic or linear viscoelastic FE model may not simulate permanent deformation or shear creep strains after repetitions of vehicular loading, a nonlinear time-hardening creep model could predict primary rutting damage in HMA and shear creep strains at the edge of the tire imprint caused by different tire configurations.
Imad Al-Qadi; Pyeong Jun Yoo; Mostafa A. Elseifi; Susan Nelson. Creep Behavior of Hot-Mix Asphalt due to Heavy Vehicular Tire Loading. Journal of Engineering Mechanics 2009, 135, 1265 -1273.
AMA StyleImad Al-Qadi, Pyeong Jun Yoo, Mostafa A. Elseifi, Susan Nelson. Creep Behavior of Hot-Mix Asphalt due to Heavy Vehicular Tire Loading. Journal of Engineering Mechanics. 2009; 135 (11):1265-1273.
Chicago/Turabian StyleImad Al-Qadi; Pyeong Jun Yoo; Mostafa A. Elseifi; Susan Nelson. 2009. "Creep Behavior of Hot-Mix Asphalt due to Heavy Vehicular Tire Loading." Journal of Engineering Mechanics 135, no. 11: 1265-1273.
The objective of this study was to characterize hot-mix asphalt (HMA) viscoelastic properties at intermediate and high temperatures and to incorporate laboratory-determined parameters into a three-dimensional finite element (FE) model to accurately simulate pavement responses to vehicular loading at different temperatures and speeds. Results of the developed FE model were compared against field-measured pavement responses from the Virginia Smart Road. Results of this analysis indicated that the elastic theory grossly underpredicts pavement responses to vehicular loading at intermediate and high temperatures. In addition, the elastic FE model could not simulate permanent deformation or delayed recovery, a known characteristic of HMA materials. In contrast, results of the FE viscoelastic model were in better agreement with field measurements. In this case, the average error in the prediction was less than 15%. The FE model successfully simulated retardation of the response in the transverse direction and rapid relaxation of HMA in the longitudinal direction. Moreover, the developed model allowed predicting primary rutting damage at the surface and its partial recovery after load application.
Mostafa A. Elseifi; Imad Al-Qadi; Pyeong Jun Yoo. Viscoelastic Modeling and Field Validation of Flexible Pavements. Journal of Engineering Mechanics 2006, 132, 172 -178.
AMA StyleMostafa A. Elseifi, Imad Al-Qadi, Pyeong Jun Yoo. Viscoelastic Modeling and Field Validation of Flexible Pavements. Journal of Engineering Mechanics. 2006; 132 (2):172-178.
Chicago/Turabian StyleMostafa A. Elseifi; Imad Al-Qadi; Pyeong Jun Yoo. 2006. "Viscoelastic Modeling and Field Validation of Flexible Pavements." Journal of Engineering Mechanics 132, no. 2: 172-178.