Investigation and optimization of waste LDPE plastic as a modifier of asphalt mix for highway asphalt: Case of Ethiopian roads

Genet, Melkamu Birlie; Sendekie, Zenamarkos Bantie; Jembere, Addis Lemessa

doi:10.1016/j.cscee.2021.100150

Cited by 23 publications

(12 citation statements)

References 16 publications

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“…These findings offer insights into optimizing plastic-modified asphalt mixes for improved performance. These test results are consistent with previous research findings [35,39,40].…”

Section: Bulk Specific Gravity (Gmb)supporting

confidence: 93%

Plastic roads: asphalt mix design and performance

Shah,

Yousaf,

Khalid

et al. 2024

Discov Appl Sci

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Plastic materials are extensively utilized in various aspects of daily life. However, the substantial amount of plastic waste generated can cause significant global environmental issues without efficient waste management practices. To address this problem, the utilization of waste plastics in high-value applications such as highway construction through hot mix asphalt (HMA) has been deemed ideal. Polyethylene terephthalate (PET), low-density polyethylene (LDPE), and high-density polyethylene (HDPE) are the three most prevalent types of plastic waste found in municipal solid waste. The impact of plastic-type and content on the mechanical, volumetric, and durability properties of hot mixed asphalt (HMA) was investigated by utilizing varying plastic contents of PET, LDPE, and HDPE. Tests were conducted in accordance with ASTM standards on twelve HMA mixtures made with an optimal binder content (OBC) of 4.3%, and plastic contents of 3%, 6%, 9%, and 12% by weight of OBC. Marshall stability and flow tests were conducted to ascertain the optimal plastic content for each tested mixture. The findings indicated that the stability and flow values improved as the plastic content was raised. 9% LDPE mix gave a maximum Marshal stability value of 12 kN. Additionally, as the plastic content increased, the values for air voids and voids filled with asphalt decreased in all 12 mixes tested. This research aligns with the United Nations 2030 sustainable development goals (SDGs), including SDGs 9, 11, 12, 13, 14, and 15, and presents a viable method for implementing the 3Rs approach towards sustainable plastic waste management.

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“…These findings offer insights into optimizing plastic-modified asphalt mixes for improved performance. These test results are consistent with previous research findings [35,39,40].…”

Section: Bulk Specific Gravity (Gmb)supporting

confidence: 93%

Plastic roads: asphalt mix design and performance

Shah,

Yousaf,

Khalid

et al. 2024

Discov Appl Sci

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“…Evaluating the effectiveness of recycled LDPE, in conjunction with other additives, has emerged as a key area of interest, aiming to optimize the use of recycled materials in pavement construction. The exploration of such applications sets the stage for the current research, which seeks to advance the understanding and practical implementation of recycled LDPE and associated additives for the sustainable improvement of asphalt mixtures [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Sustainable Asphalt Mixtures with Enhanced Water Resistance for Flood-Prone Regions Using Recycled LDPE and Carnauba–Soybean Oil Additive

Kim,

2024

Polymers

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This manuscript presents a comprehensive study on the sustainable optimization of asphalt mixtures tailored for regions prone to flooding. The research addresses the challenges associated with water damage to asphalt pavements by incorporating innovative additives. The study centers on incorporating recycled Low-Density Polyethylene (LDPE) and a tailored Carnauba–Soybean Oil Additive, advancing asphalt mixtures with a Control mix, LDPE (5%) + Control, and LDPE (5%) + 3% Oil + Control. A critical aspect of the research involves subjecting these mixtures to 30 wetting and drying cycles, simulating the conditions prevalent in tropical flood-prone areas. The incorporation of innovative additives in asphalt mixtures has demonstrated significant improvements across various performance parameters. Tensile Strength Ratio (TSR) tests revealed enhanced tensile strength, with the LDPE (5%) + 3% Oil-modified mixture exhibiting an impressive TSR of 85.7%. Dynamic Modulus tests highlighted improved rutting resistance, showcasing a remarkable increase to 214 MPa in the LDPE (5%) with a 3% Oil-modified mixture. The Semi-Circular Bending (SCB) test demonstrated increased fracture resistance and energy absorption, particularly in the LDPE (5%) with 3% Oil-modified mixture. Hamburg Wheel-Tracking (HWT) tests indicated enhanced moisture resistance and superior rutting resistance at 20,000 cycles for the same mixture. Cantabro tests underscored improved aggregate shatter resistance, with the LDPE (5%) + 3% Oil-modified mixture exhibiting the lowest weight loss rate at 9.820%. Field tests provided real-world insights, with the LDPE (5%) + 3% Oil mixture displaying superior stability, a 61% reduction in deflection, and a 256% improvement in surface modulus over the control mixture. This research lays the groundwork for advancing the development of sustainable, high-performance road pavement materials, marking a significant stride towards resilient infrastructure in flood-prone areas.

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“…Relevant studies have confirmed that the addition of CR can significantly improve asphalt's high-temperature performance and resistance to permanent deformation, but it will adversely affect the low-temperature performance of asphalt, and there are density differences and thermodynamic incompatibilities between CR and matrix asphalt, resulting in the poor storage stability of modified asphalt [9][10][11]. Due to its softness and elongation, LDPE tends to react with asphalt during processing to form new cross-linked structures, thus improving the high-temperature stability and temperature sensitivity of modified asphalt and its mixes [12]. Studies have shown that the addition of LDPE does not effectively help asphalt's low-temperature performance, but if the dosage of LDPE exceeds a certain amount, it will play a role in enhancing the toughening of asphalt [13].…”

Section: Introductionmentioning

confidence: 99%

Study on the Physical and Rheological Characterisation of Low-Density Polyethylene (LDPE)/Recycled Crumb Rubber (RCR) on Asphalt Binders

Zhang,

Yan,

Yang

et al. 2024

Molecules

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Recycled crumb rubber (RCR) is considered a reliable asphalt modifier and a solution to the problem of scrap tyre recycling. RCR-modified asphalt (RCRMA) typically has good low-temperature performance and storage stability. However, the pre-treatment of crumb rubber (CR) impairs its physical properties, resulting in poor high-temperature performance, which limits the industrial application of RCRMA. In this study, low-density polyethylene (LDPE) composite RCR was used to modify asphalt, and LDPE/RCR-composite-modified asphalt (L-RCRMA) was produced to compensate for the deficiencies in the high-temperature performance of RCRMA. The comprehensive physical properties of L-RCRMA were elucidated using tests such as the conventional properties, rotational viscosity, and rheological tests. The results showed that the incorporation of LDPE improved the high-temperature stability and rutting resistance of the asphalt, but an excessive amount of LDPE impaired the low-temperature performance and storage stability of L-RCRMA. Therefore, it is necessary to control the amount of LDPE to balance the performance of the asphalt. On this basis, we recommend a dosage of 20% for RCR and 1.5% for LDPE.

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Investigation and optimization of waste LDPE plastic as a modifier of asphalt mix for highway asphalt: Case of Ethiopian roads

Cited by 23 publications

References 16 publications

Plastic roads: asphalt mix design and performance

Plastic roads: asphalt mix design and performance

Sustainable Asphalt Mixtures with Enhanced Water Resistance for Flood-Prone Regions Using Recycled LDPE and Carnauba–Soybean Oil Additive

Study on the Physical and Rheological Characterisation of Low-Density Polyethylene (LDPE)/Recycled Crumb Rubber (RCR) on Asphalt Binders

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