Effects of Recycled Polyethylene Terephthalate (PET) on Stiffness of Hot Asphalt Mixtures

Movilla-Quesada, D.; Raposeiras, A.C.; Olavarría, J.

doi:10.1155/2019/6969826

Cited by 21 publications

(15 citation statements)

References 14 publications

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“…The plastic bags were shredded to an approximate size of 5-10 mm, as shown in Figure 1. This small size range was chosen to increase the homogeneity of the mixture during the blending process (Movilla-Quesada et al, 2019a). The density of the shredded plastic was determined using a gas pycnometer (Micrometrics Accupyc II TEC).…”

Section: Plastic Wastementioning

confidence: 99%

Enhanced Dry Process Method for Modified Asphalt Containing Plastic Waste

et al. 2021

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In recent years, the proliferation of plastic waste has become a global problem. A potential solution to this problem is the dry process, which incorporates plastic waste into asphalt mixtures. However, the dry process often has inconsistent performance due to poor interaction with binder and improper distribution of plastic waste particles in the mixture skeleton. This inconsistency may be caused by inaccurate mixing method, shredding size, mixing temperature and ingredient priorities. Thus, this study aims to improve the consistency of the dry process by comparing the control asphalt mixture and two plastic waste-modified asphalt mixtures prepared using the dry process. This study used crushed granite aggregate with the nominal maximum aggregate size of 14 mm whereas the shredded plastic bag is in the range of 5–10 mm. Quantitative sieving analysis and performance tests were carried out to examine the effects of plastic waste added into the asphalt mixture. The volumetric and performance properties combined with image analysis of the modified mixtures were obtained and compared with the control mixture. In addition, the moisture damage, resilient modulus, creep deformation and rutting were evaluated. This study also highlighted in detail the distribution of plastic particles in the final skeleton of the asphalt mixture. Based on the analysis, an enhanced dry process of mixing procedure was proposed and evaluated. Results showed that the addition of plastic particles using the conventional dry process leads to the deviation in the aggregate structure as high plastic content is added. Furthermore, the enhanced dry process developed in this study presents substantial enhancement in the asphalt performance, particularly with plastic waste that accounts for 20% of the weight of the asphalt binder.

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Section: Plastic Wastementioning

confidence: 99%

Enhanced Dry Process Method for Modified Asphalt Containing Plastic Waste

et al. 2021

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“…Tire chips have high insulating properties. The use of tire chips as fill material in subgrade applications results in a reduced depth of frost penetration relative to granular soil [32,53,54]. The dry process makes use of rubber as an aggregate.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

A Review of the Utilisation of Recycled Waste Material as an Alternative Modifier in Asphalt Mixtures

2020

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The possibility of using waste materials in road construction is of great interest as their utilisation may contribute to reducing the problems of hazard and pollution and conserve natural resources. Thus, there is an urgent need to find a sustainable method for using waste materials as a substitute in the standard asphalt binders. There are several concerns about the physical and chemical properties and mechanical performance of asphalt pavements incorporated with waste material in the effort to reduce permanent deformation of the road surface. This review article presents a brief discussion of the asphalt mixtures modified with waste material, and the recycled materials used as a modifier in the asphalt mixture. The present paper summarises the use of crumb rubber, crushed concrete, steel slag, glass fibre and plastic waste in asphalt mixtures. The use of waste materials as a modifier in asphalt mixture resulted in improved asphalt pavement performance. Results advocate that rubberised asphalt mixture with desired properties can be designed as an additive with a friendly environmental approach in construction materials. The researches that adopted the influence of usage, recycle waste material to improve the performance of the asphalt of the road are still limited compared to other construction fields. Doi: 10.28991/cej-2020-SP(EMCE)-05 Full Text: PDF

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“…On the other hand, climate change and the improvement of sustainability have increased the search for alternatives in road engineering that help minimise the disposal of waste and industrial by-products in the environment and reduce the extraction of natural resources. Among the various materials that have been used are reclaimed asphalt pavement (RAP), copper slag, steel slag, blast furnace slag (BFS), cellulose ash, plastic bottles, end-of-life tyres (crumb rubber), fishing nets, cellulose fibre and construction and demolition waste [23][24][25][26][27][28][29][30][31]. However, although the replacement of traditional asphalt mix materials with these wastes and by-products helps to reduce the environmental impact of over-exploitation of raw materials, the actual reduction of the global environmental impact must consider whether the use of these materials implies a higher energy consumption or whether the pollutant gases emitted in the process increase, causing the environmental benefit to be reduced, especially when plastic wastes are used.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Greenhouse Gas Emissions and the Environmental Impact of the Production of Asphalt Mixes Modified with Recycled Materials

Movilla-Quesada

Lagos-Varas²,

Raposeiras

et al. 2021

Sustainability

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This research focuses on the production and construction stages of the life cycle analysis (LCA) of asphalt mixtures modified with industrial waste and by-products, based on the quantification of methane (CH4), carbon monoxide (CO) and carbon dioxide (CO2) emissions produced during these processes. A laboratory-designed and calibrated gas measurement system with a microcontroller and MQ sensors is used to compare the emissions (GHG) of a “conventional” asphalt mix with those emitted by waste-modified asphalt mixes (polyethylene terephthalate and nylon fibres) and industrial by-products (copper slag and cellulose ash). The results obtained show that the gases emitted by each type of material can influence the design criteria from an environmental perspective. Methane gas emissions for asphalt mixes made with polymeric materials increase compared to the production phase of a conventional mix (M1) by 21% for PET and 14% for nylon. In contrast, for mixtures made with copper slag and cellulose ash, this emission is reduced by 12%. In addition, the use of copper slag and cellulose ash to replace natural aggregates reduces greenhouse gas emissions by 15% during the production phase and contributes to the creation of photochemical ozone for a shorter period of time. Regarding carbon dioxide emission, it increases considerably for all asphalt mixes, by 26% and 44.5% for cellulose ash and copper slag, respectively. For asphalt mixtures made of polymeric materials, the increase in carbon dioxide emission is significant, 130% for PET and 53% for nylon. In addition, it is noted that for this type of material, not only the emission of the gas must be taken into consideration, but also the time that the volatile particles spend in the atmosphere, affecting climate change and photochemical ozone (smog). The carbon monoxide gases emitted in the production phase of all the asphalt mixes analysed is similar among them.

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Effects of Recycled Polyethylene Terephthalate (PET) on Stiffness of Hot Asphalt Mixtures

Cited by 21 publications

References 14 publications

Enhanced Dry Process Method for Modified Asphalt Containing Plastic Waste

Enhanced Dry Process Method for Modified Asphalt Containing Plastic Waste

A Review of the Utilisation of Recycled Waste Material as an Alternative Modifier in Asphalt Mixtures

Analysis of Greenhouse Gas Emissions and the Environmental Impact of the Production of Asphalt Mixes Modified with Recycled Materials

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