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Dr. Pooyan Ayar
School of Civil Engineering, Iran University of Science and Technology, Tehran 16846-13114, Iran

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Research Keywords & Expertise

0 Waste materials
0 Pavement recycling
0 Bituminous materials
0 Sustainable transport infrastructures
0 Self-healing construction materials

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Bituminous materials
Waste materials

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Journal article
Published: 26 March 2021 in Construction and Building Materials
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Polymer modification of bitumen is a popular method to enhance its performance. Over the years, researchers have suggested and developed various polymeric bitumen modifiers, and this trend in research is in progress to introduce new polymers with higher modification efficacies. Silane crosslinkable polyethylene is a widely used polymer as cable insulation, and its waste was used as bitumen modifier in this study. After shaping this polymer around the metal conductors and providing the crosslinking condition, silane-crosslinked polyethylene (Si-XLPE) insulation is obtained. When compared to ordinary polyethylene, Si-XLPE exhibits superlative performance, such as enhanced thermal, mechanical, elasticity, and stress cracking properties. Herein, the cable production wastes of this polymer were utilized for bitumen modification before crosslinking. Comprehensive analyses were carried out for characterizing the fabricated samples, including conventional physical (softening point, penetration, and storage stability), morphological (optical and fluorescence microscopies), chemical (FTIR), thermal (DSC), and performance grade (PG) assessments. For PG determination, rolling thin film oven (RTFO) and pressure aging vessel (PAV) tests, along with rotational viscometer (RV), dynamic shear rheometer (DSR), and bending-beam rheometer (BBR) tools were employed. Findings indicated the formation of a polymeric phase network in the bitumen matrix with altering shapes depending on the polymer content. This was identified to be the origin of appeared structural enhancements in the Si-XLPE modified bitumen samples. Moreover, it was revealed that Si-XLPE contents in 2% and more led to phase separations in the unaged or aged states due to high swelling ratio of Si-XLPE. Strikingly, it was seen that only 1% of Si-XLPE could change the PG 58-22 of base bitumen to PG 70-22, which confirmed promising efficiency of recycled Si-XLPE in low contents for significant improvements in the bitumen's high temperature performance without adverse effects on its low temperature performance. Eventually, recycled silane crosslinkable polyethylene can be an advantageous potential bitumen-modifier that is favorable from technical, environmental, and economical perspectives.

ACS Style

Navid Mostofi Sarkari; Pooyan Ayar; Mostafa Hatefi Oskouei; Fariba Karimian Khosrowshahi; Mohsen Mohseni. Silane crosslinkable polyethylene waste as bitumen modifier: A new fortunate destiny by in time recycling of thermoplastic waste before conversion to thermoset end-of-life unrecyclable polymer. Construction and Building Materials 2021, 287, 122999 .

AMA Style

Navid Mostofi Sarkari, Pooyan Ayar, Mostafa Hatefi Oskouei, Fariba Karimian Khosrowshahi, Mohsen Mohseni. Silane crosslinkable polyethylene waste as bitumen modifier: A new fortunate destiny by in time recycling of thermoplastic waste before conversion to thermoset end-of-life unrecyclable polymer. Construction and Building Materials. 2021; 287 ():122999.

Chicago/Turabian Style

Navid Mostofi Sarkari; Pooyan Ayar; Mostafa Hatefi Oskouei; Fariba Karimian Khosrowshahi; Mohsen Mohseni. 2021. "Silane crosslinkable polyethylene waste as bitumen modifier: A new fortunate destiny by in time recycling of thermoplastic waste before conversion to thermoset end-of-life unrecyclable polymer." Construction and Building Materials 287, no. : 122999.

Journal article
Published: 17 March 2021 in Sustainability
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The use of waste materials has been increasingly conceived as a sustainable alternative to conventional materials in the road construction industry, as concerns have arisen from the uncontrolled exploitation of natural resources in recent years. Re-refined acidic sludge (RAS) obtained from a waste material—acidic sludge—is an alternative source for bitumen. This study’s primary purpose is to evaluate the resistance of warm mix asphalt (WMA) mixtures containing RAS and a polymeric additive against moisture damage and rutting. The modified bitumen studied in this research is a mixture of virgin bitumen 60/70, RAS (10, 20, and 30%), and amorphous poly alpha olefin (APAO) polymer. To this end, Marshall test, moisture susceptibility tests (i.e., tensile strength ratio (TSR), residual Marshall, and Texas boiling water), resilient modulus, and rutting assessment tests (i.e., dynamic creep, Marshall quotient, and Kim) were carried out. The results showed superior values for modified mixtures compared to the control mix considering the Marshall test. Moreover, the probability of a reduction in mixes’ moisture damage was proved by moisture sensitivity tests. The results showed that modified mixtures could improve asphalt mixtures’ permanent deformation resistance and its resilience modulus. Asphalt mixtures containing 20% RAS (substitute for bitumen) showed a better performance in all the experiments among the samples tested.

ACS Style

Mansour Fakhri; Danial Arzjani; Pooyan Ayar; Maede Mottaghi; Nima Arzjani. Performance Evaluation of WMA Containing Re-Refined Acidic Sludge and Amorphous Poly Alpha Olefin (APAO). Sustainability 2021, 13, 3315 .

AMA Style

Mansour Fakhri, Danial Arzjani, Pooyan Ayar, Maede Mottaghi, Nima Arzjani. Performance Evaluation of WMA Containing Re-Refined Acidic Sludge and Amorphous Poly Alpha Olefin (APAO). Sustainability. 2021; 13 (6):3315.

Chicago/Turabian Style

Mansour Fakhri; Danial Arzjani; Pooyan Ayar; Maede Mottaghi; Nima Arzjani. 2021. "Performance Evaluation of WMA Containing Re-Refined Acidic Sludge and Amorphous Poly Alpha Olefin (APAO)." Sustainability 13, no. 6: 3315.

Journal article
Published: 01 September 2020 in Construction and Building Materials
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This study was conducted due to lack of comprehensive documentation on the fracture and mechanical properties of asphalt mixtures containing Polyethylene Terephthalate (PET) particles. To this end, PET granules were used to replace a specific portion of mineral aggregates (i.e., passing from sieve #4 and retained on sieve #8) with different contents including 0, 30, 50, 70 and 100%. In this regard, Indirect Tensile Strength (ITS), moisture sensitivity, Semi-Circular Bending (SCB), and wheel tracking tests have been carried out under different testing conditions. The Weibull model was also used to obtain a more detailed investigation of fracture data outcomes. The results showed that although the increased PET contents resulted in reduced ITS values, moisture resistance was enhanced. Improved resistance against rutting distress at 45 ℃ was also observed, indicating that using different PET contents could increase the stiffness of mixtures. Further, Weibull distribution indicated that the fracture failure at −20 ℃ was more probable than that of at 0 ℃. Additionally, fracture resistance was reduced when 30 and 50% PET included in the asphalt mixtures. However, increasing PET contents in the mixtures resulted in limited periods of tolerable fracture energy, and this, in turn, increased the probability of fracture failure.

ACS Style

Amin Shams Esfandabad; Seyed Mohsen Motevalizadeh; Reza Sedghi; Pooyan Ayar; Seyed Mohammad Asgharzadeh. Fracture and mechanical properties of asphalt mixtures containing granular polyethylene terephthalate (PET). Construction and Building Materials 2020, 259, 120410 .

AMA Style

Amin Shams Esfandabad, Seyed Mohsen Motevalizadeh, Reza Sedghi, Pooyan Ayar, Seyed Mohammad Asgharzadeh. Fracture and mechanical properties of asphalt mixtures containing granular polyethylene terephthalate (PET). Construction and Building Materials. 2020; 259 ():120410.

Chicago/Turabian Style

Amin Shams Esfandabad; Seyed Mohsen Motevalizadeh; Reza Sedghi; Pooyan Ayar; Seyed Mohammad Asgharzadeh. 2020. "Fracture and mechanical properties of asphalt mixtures containing granular polyethylene terephthalate (PET)." Construction and Building Materials 259, no. : 120410.

Research article
Published: 27 November 2019 in Journal of Thermoplastic Composite Materials
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Abundance, affordability, and also the usability of sulfur as a part of the binder are the main reasons for using this additive in asphalt mixtures. However, lack of proper adhesion and brittle behavior of sulfur-modified asphalt mixtures could make them susceptible to moisture damage and fatigue cracking. In this regard, anti-stripping agents and some polymers like crumb rubber may be used to overcome these types of distresses. This research aimed at investigating the effects of polymeric sulfur and crumb rubber on the moisture sensitivity and fatigue behavior of asphalt mixtures. To this end, asphalt mixtures were subjected to 1 and 3 freeze-thaw cycles. Then, an indirect tensile fatigue test was carried out. Moreover, the response surface method (RSM) was used to assess the interaction between various parameters in samples containing polymeric sulfur and crumb rubber. Results showed that with an increase in polymeric sulfur content, the fatigue life was reduced and the moisture sensitivity was increased. Additionally, the RSM was found to be effective in ranking parameters influencing the performance of asphalt mixtures. According to the experimental results, a crumb rubber-modified binder could improve the fatigue life of the polymeric sulfur-modified mixture up to 70%. Furthermore, experimental results and RSM analysis indicated that crumb rubber would be more effective in higher numbers of freeze-thaw cycles and raised temperatures, in which polymeric sulfur-modified asphalt mixtures are probably prone to moisture damages (i.e. the lack of adequate cohesion and adhesion).

ACS Style

Amir Kavussi; Mehdi Azarnia; Pooyan Ayar; Makan Pedram. The fatigue behavior of polymeric sulfur-modified asphalt mixtures subjected to freeze-thaw conditioning. Journal of Thermoplastic Composite Materials 2019, 1 .

AMA Style

Amir Kavussi, Mehdi Azarnia, Pooyan Ayar, Makan Pedram. The fatigue behavior of polymeric sulfur-modified asphalt mixtures subjected to freeze-thaw conditioning. Journal of Thermoplastic Composite Materials. 2019; ():1.

Chicago/Turabian Style

Amir Kavussi; Mehdi Azarnia; Pooyan Ayar; Makan Pedram. 2019. "The fatigue behavior of polymeric sulfur-modified asphalt mixtures subjected to freeze-thaw conditioning." Journal of Thermoplastic Composite Materials , no. : 1.

Journal article
Published: 01 July 2018 in Construction and Building Materials
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Cold recycling technology has been recognized as an efficient, cost-effective, and environmentally friendly method to rehabilitate asphalt pavements. Based on previous experiments, some solutions such as using additives (e.g. cement, lime, and waste pozzolans) and modifying bitumen emulsion have been proposed to enhance the performance, as well as to improve the sustainability of Recycled Mixture with Bitumen Emulsion (RMBE) as a cleaner product. Although some studies have evaluated the laboratory protocols to design RMBEs, there still remain many unclear issues related to the use of additives. Therefore, this article tries to review the general criteria for additive selection, and also to assess the different functional aspects of RMBEs (e.g. physical, durability and mechanical characteristics), paying attention to the impacts of additives. Additionally, key points concerning the use of modified bitumen emulsion in RMBEs were assessed. Finally, a series of important lines for further investigations in this field have been presented.

ACS Style

Pooyan Ayar. Effects of additives on the mechanical performance in recycled mixtures with bitumen emulsion: An overview. Construction and Building Materials 2018, 178, 551 -561.

AMA Style

Pooyan Ayar. Effects of additives on the mechanical performance in recycled mixtures with bitumen emulsion: An overview. Construction and Building Materials. 2018; 178 ():551-561.

Chicago/Turabian Style

Pooyan Ayar. 2018. "Effects of additives on the mechanical performance in recycled mixtures with bitumen emulsion: An overview." Construction and Building Materials 178, no. : 551-561.

Journal article
Published: 01 April 2018 in Construction and Building Materials
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ACS Style

Seyed Mohsen Motevalizadeh; Pooyan Ayar; Sadegh Yeganeh; Mahmoud Ameri; Keyvan Bemana. Investigating the impact of different loading patterns on the permanent deformation behaviour in hot mix asphalt. Construction and Building Materials 2018, 167, 707 -715.

AMA Style

Seyed Mohsen Motevalizadeh, Pooyan Ayar, Sadegh Yeganeh, Mahmoud Ameri, Keyvan Bemana. Investigating the impact of different loading patterns on the permanent deformation behaviour in hot mix asphalt. Construction and Building Materials. 2018; 167 ():707-715.

Chicago/Turabian Style

Seyed Mohsen Motevalizadeh; Pooyan Ayar; Sadegh Yeganeh; Mahmoud Ameri; Keyvan Bemana. 2018. "Investigating the impact of different loading patterns on the permanent deformation behaviour in hot mix asphalt." Construction and Building Materials 167, no. : 707-715.

Journal article
Published: 25 January 2018 in Materials and Structures
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Recovery capability of bituminous materials plays a significant role in the development of new technologies for extending the service life of asphalt pavements. This capability originates from various phenomena such as thixotropy, cooling, relaxation of hardening, or healing. However, their real effect on mechanical response is not clear. This article aims to investigate how rest periods (RPs) available between traffic loads can contribute to the damage recovery of bituminous materials. For this purpose, different types and durations of RPs were applied during the laboratory evaluation of fatigue resistance of these materials using the University of Granada Fatigue Asphalt Cracking Test method. The results indicate that the addition of RPs to the loading regime could lead to an extension in the fatigue life of bituminous materials. Additionally, an increase in the RP duration showed a positive impact on the resistance of the materials against cyclic loading. Nonetheless, these benefits are not only related to the recovery of lost properties during RPs, but also a growth in the amount of plastic deformations as a result of the applying RPs could delay the appearance of damages (i.e. cracking). Consequently, the bituminous material can tolerate a higher number of load cycles during fatigue test.

ACS Style

Pooyan Ayar; Fernando Moreno-Navarro; Miguel Sol-Sánchez; Mª Carmen Rubio-Gámez. Exploring the recovery of fatigue damage in bituminous mixtures: the role of rest periods. Materials and Structures 2018, 51, 25 .

AMA Style

Pooyan Ayar, Fernando Moreno-Navarro, Miguel Sol-Sánchez, Mª Carmen Rubio-Gámez. Exploring the recovery of fatigue damage in bituminous mixtures: the role of rest periods. Materials and Structures. 2018; 51 (1):25.

Chicago/Turabian Style

Pooyan Ayar; Fernando Moreno-Navarro; Miguel Sol-Sánchez; Mª Carmen Rubio-Gámez. 2018. "Exploring the recovery of fatigue damage in bituminous mixtures: the role of rest periods." Materials and Structures 51, no. 1: 25.

Original articles
Published: 29 March 2017 in Road Materials and Pavement Design
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Recently, the analysis of the healing capacity of bituminous materials has become an important research topic in pavement engineering. Although many studies have demonstrated the potential of some techniques (e.g. self-healing agents or induced healing) to recover the properties of these materials, there still remain some questions that need to be addressed. One of the most important issues is how to define the optimal moment for inducing healing (at micro or macro-crack levels), along with determining the optimal conditions for using the technique. Accordingly, this paper aims to provide an approach to answer these questions. In this research, several mixtures were tested under various conditions until their fracture, and then healed using a range of healing techniques. Following the healing process, the materials were re-tested and the efficiency of the healing at macro-crack level was assessed. The results indicate that the healing capacity at macro-crack level appears to be sensitive to the service conditions; in general, as the temperature of the healing treatment increases, the rate of recovery increases. Furthermore, it was observed that the recovery potential of conventional binder is higher than modified binders at macro-damage level. Additionally, the presence of external loads during application of the healing treatment could increase the rate of recovery. Nonetheless, it is important to note that the application of heating and/or external force as healing techniques produced low levels of recovery in macro-damaged asphalt materials.

ACS Style

Fernando Moreno-Navarro; Pooyan Ayar; Miguel Sol-Sánchez; M. Carmen Rubio-Gámez. Exploring the recovery of fatigue damage in bituminous mixtures at macro-crack level: the influence of temperature, time, and external loads. Road Materials and Pavement Design 2017, 18, 1 -11.

AMA Style

Fernando Moreno-Navarro, Pooyan Ayar, Miguel Sol-Sánchez, M. Carmen Rubio-Gámez. Exploring the recovery of fatigue damage in bituminous mixtures at macro-crack level: the influence of temperature, time, and external loads. Road Materials and Pavement Design. 2017; 18 (sup2):1-11.

Chicago/Turabian Style

Fernando Moreno-Navarro; Pooyan Ayar; Miguel Sol-Sánchez; M. Carmen Rubio-Gámez. 2017. "Exploring the recovery of fatigue damage in bituminous mixtures at macro-crack level: the influence of temperature, time, and external loads." Road Materials and Pavement Design 18, no. sup2: 1-11.

Journal article
Published: 01 February 2016 in Journal of Cleaner Production
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ACS Style

Pooyan Ayar; Fernando Manuel Moreno Navarro; Mª Carmen Rubio-Gámez. The healing capability of asphalt pavements: a state of the art review. Journal of Cleaner Production 2016, 113, 28 -40.

AMA Style

Pooyan Ayar, Fernando Manuel Moreno Navarro, Mª Carmen Rubio-Gámez. The healing capability of asphalt pavements: a state of the art review. Journal of Cleaner Production. 2016; 113 ():28-40.

Chicago/Turabian Style

Pooyan Ayar; Fernando Manuel Moreno Navarro; Mª Carmen Rubio-Gámez. 2016. "The healing capability of asphalt pavements: a state of the art review." Journal of Cleaner Production 113, no. : 28-40.

Journal article
Published: 01 March 2015 in Journal of Cleaner Production
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ACS Style

Amir Modarres; Morteza Rahmanzadeh; Pooyan Ayar. Effect of coal waste powder in hot mix asphalt compared to conventional fillers: mix mechanical properties and environmental impacts. Journal of Cleaner Production 2015, 91, 262 -268.

AMA Style

Amir Modarres, Morteza Rahmanzadeh, Pooyan Ayar. Effect of coal waste powder in hot mix asphalt compared to conventional fillers: mix mechanical properties and environmental impacts. Journal of Cleaner Production. 2015; 91 ():262-268.

Chicago/Turabian Style

Amir Modarres; Morteza Rahmanzadeh; Pooyan Ayar. 2015. "Effect of coal waste powder in hot mix asphalt compared to conventional fillers: mix mechanical properties and environmental impacts." Journal of Cleaner Production 91, no. : 262-268.

Journal article
Published: 01 February 2015 in Cold Regions Science and Technology
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ACS Style

Amir Modarres; Hossein Ramyar; Pooyan Ayar. Effect of cement kiln dust on the low-temperature durability and fatigue life of hot mix asphalt. Cold Regions Science and Technology 2015, 110, 59 -66.

AMA Style

Amir Modarres, Hossein Ramyar, Pooyan Ayar. Effect of cement kiln dust on the low-temperature durability and fatigue life of hot mix asphalt. Cold Regions Science and Technology. 2015; 110 ():59-66.

Chicago/Turabian Style

Amir Modarres; Hossein Ramyar; Pooyan Ayar. 2015. "Effect of cement kiln dust on the low-temperature durability and fatigue life of hot mix asphalt." Cold Regions Science and Technology 110, no. : 59-66.

Journal article
Published: 13 November 2014 in International Journal of Pavement Engineering
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ACS Style

Amir Modarres; Pooyan Ayar. Comparing the mechanical properties of cold recycled mixture containing coal waste additive and ordinary Portland cement. International Journal of Pavement Engineering 2014, 17, 1 -14.

AMA Style

Amir Modarres, Pooyan Ayar. Comparing the mechanical properties of cold recycled mixture containing coal waste additive and ordinary Portland cement. International Journal of Pavement Engineering. 2014; 17 (3):1-14.

Chicago/Turabian Style

Amir Modarres; Pooyan Ayar. 2014. "Comparing the mechanical properties of cold recycled mixture containing coal waste additive and ordinary Portland cement." International Journal of Pavement Engineering 17, no. 3: 1-14.

Journal article
Published: 01 November 2014 in Journal of Cleaner Production
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ACS Style

Amir Modarres; Pooyan Ayar. Coal waste application in recycled asphalt mixtures with bitumen emulsion. Journal of Cleaner Production 2014, 83, 263 -272.

AMA Style

Amir Modarres, Pooyan Ayar. Coal waste application in recycled asphalt mixtures with bitumen emulsion. Journal of Cleaner Production. 2014; 83 ():263-272.

Chicago/Turabian Style

Amir Modarres; Pooyan Ayar. 2014. "Coal waste application in recycled asphalt mixtures with bitumen emulsion." Journal of Cleaner Production 83, no. : 263-272.

Journal article
Published: 30 June 1957 in Materiales de Construcción
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Very Thin Asphalt Overlay (VTAO) has been introduced as an alternative to traditional thick overlays, seal coats, and micro-surfacings. Nonetheless, there are some challenges that still remain regarding the application of VTAOs (such as mixture type, cohesiveness, wear resistance, cracking and durability), particularly in heavy traffic urban areas. Therefore, this paper presents an extensive comparative evaluation of the mechanical performance, durability and safety issues (cohesiveness, adhesiveness, ageing, cracking, plastic deformation, permeability, macrotexture, skid and wear resistance, and fuel resistance) of a VTAO (20 mm thick) and a high performance BBTM 11B (35 mm thick), commonly used as an open-graded mixture for pavement overlays. The results demonstrated that VTAO is an appropriate material for urban pavements as it provides good durability and resistance to the propagation of defects. Nonetheless, further studies are required to improve its behavior under distresses related to plastic deformations and safety properties.

ACS Style

M. Sol-Sánchez; G. García-Travé; Pooyan Ayar; F. Moreno-Navarro; Mª Carmen Rubio Gámez. Evaluación del comportamiento mecánico de capas bituminosas ultra delgadas como una adecuada estrategia para la rehabilitación de pavimentos urbanos. Materiales de Construcción 1957, 7, 132 .

AMA Style

M. Sol-Sánchez, G. García-Travé, Pooyan Ayar, F. Moreno-Navarro, Mª Carmen Rubio Gámez. Evaluación del comportamiento mecánico de capas bituminosas ultra delgadas como una adecuada estrategia para la rehabilitación de pavimentos urbanos. Materiales de Construcción. 1957; 7 (80):132.

Chicago/Turabian Style

M. Sol-Sánchez; G. García-Travé; Pooyan Ayar; F. Moreno-Navarro; Mª Carmen Rubio Gámez. 1957. "Evaluación del comportamiento mecánico de capas bituminosas ultra delgadas como una adecuada estrategia para la rehabilitación de pavimentos urbanos." Materiales de Construcción 7, no. 80: 132.