Life cycle assessment of roadworks in United Arab Emirates: Recycled construction waste, reclaimed asphalt pavement, warm-mix asphalt and blast furnace slag use against traditional approach

Hasan, Umair; Whyte, Andrew; Jassmi, Hamad Al

doi:10.1016/j.jclepro.2020.120531

Cited by 77 publications

(35 citation statements)

References 36 publications

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“…Overall, this study has found that the environmental benefits achieved by substituting virgin aggregates with solid waste materials, namely reclaimed asphalt and steel slag, are remarkably higher than those achieved by WMA application resulting in a temperature decrease of 30°C. This finding has also been concluded in previous research, despite unavoidable differences when compared to the present study in terms of functional units, system boundaries, and other parameters (Anthonissen et al, 2016;Hasan et al, 2020;Vidal et al, 2013). Certainly, what should not be overlooked are the benefits of WMA compared to HMA related to the asphalt workers' safety and health due to the reduced fumes and odours during paving operations, which address the social dimension of sustainability being at the infant stage of a comprehensive evaluation (Zheng et al, 2019).…”

Section: The Effect Of Production Temperaturesupporting

confidence: 87%

Environmental assessment of warm mix asphalt incorporating steel slag and high reclaimed asphalt for wearing courses: a case study

Georgiou

Loizos

2021

Road Materials and Pavement Design

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This study quantifies the potential environmental benefits associated with the incorporation of industrial by-products and recycled materials combined with warm mix asphalt (WMA) additives in wearing course mixtures for asphalt pavement construction. An electric arc furnace (EAF) steel slagbased mix and three recycled mixtures incorporating steel slag and fractionated reclaimed asphalt (RA) of varying contents (i.e. 25, 40, and 50%) were analyzed comparatively to reference hot mix asphalt (HMA) using the 'cradle-to-gate' approach. The results of this study indicated that the warm asphalt mixture incorporating steel slag and 50% RA is the most environmentally friendly alternative. The greatest environmental benefits result from the combined use of steel slag and reclaimed asphalt, which is attributed to lesser demands for raw material extraction, bitumen production, and resource supply. On the contrary, the contribution of lowering mixtures' production temperature by 30°C is minimal.

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Section: The Effect Of Production Temperaturesupporting

confidence: 87%

Environmental assessment of warm mix asphalt incorporating steel slag and high reclaimed asphalt for wearing courses: a case study

Georgiou

Loizos

2021

Road Materials and Pavement Design

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“…The substrate was coated with binder via the method proposed by Soenen et al 56 . Thickness and roughness map images at a set-point z and 1–2 frames s −1 were tested and then images (10 × 10 µm 2 ) evaluated using the open-source software Gwyddion 77 . A thermal infrared camera (FLIR-T440, US) was recorded thermographic images binder samples over certain time periods.…”

Section: Methodsmentioning

confidence: 99%

“…According to the Paris Agreement and in order to decrease the impacts and risks of climate change, there is need to reduce greenhouse gas emissions significantly and to keep global average temperature increase below 2 °C 1 , 2 . Road infrastructures account for approximately 22%, 28%, and 63% of global carbon dioxide emissions, world energy consumption, and total transportation sector-related greenhouse gas emissions, respectively 3 .…”

Section: Introductionmentioning

confidence: 99%

Rheological, physicochemical, and microstructural properties of asphalt binder modified by fumed silica nanoparticles

Cheraghian

Wistuba

Kiani

et al. 2021

Sci Rep

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Warm mix asphalt (WMA) is gaining increased attention in the asphalt paving industry as an eco-friendly and sustainable technology. WMA technologies are favorable in producing asphalt mixtures at temperatures 20–60 °C lower in comparison to conventional hot mix asphalt. This saves non-renewable fossil fuels, reduces energy consumption, and minimizes vapors and greenhouse gas emissions in the production, placement and conservation processes of asphalt mixtures. At the same time, this temperature reduction must not reduce the performance of asphalt pavements in-field. Low aging resistance, high moisture susceptibility, and low durability are generally seen as substantial drawbacks of WMA, which can lead to inferior pavement performance, and increased maintenance costs. This is partly due to the fact that low production temperature may increase the amount of water molecules trapped in the asphalt mixture. As a potential remedy, here we use fumed silica nanoparticles (FSN) have shown excellent potential in enhancing moisture and aging susceptibility of asphalt binders. In this study, asphalt binder modification by means of FSN was investigated, considering the effects of short-term and long-term aging on the rheological, thermal, and microstructural binder properties. This research paves the way for optimizing WMA by nanoparticles to present enhanced green asphalt technology.

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“…For these reasons, several studies have pointed out the environmental benefits of using recycled materials, such as RAP and EAF steel slags. Hasan et al (2020) argued that RAP obtained after milling and screening existing asphalt pavements is a viable alternative to mitigate the high GHG burdens of bitumen and aggregates (Praticò et al, 2015;Guo et al, 2018) and transport agencies (AASHTO, 2012;Hasan et al, 2020). In particular, the use of steel slags in asphalt mixtures saves natural resources, by reducing the consumption of natural and non-renewable aggregates and the quantity of slag deposited on landfill sites (Ferreira et al, 2016) and the reduction of the landfill space requirements associated with the need to landfill industrial wastes and by-products (Carpenter et al, 2007;Huang et al, 2009;Miliutenko, et al, 2013, Mladenovic et al, 2015.…”

Section: The Life Cycle Assessment In the Road Construction Sectormentioning

confidence: 99%

A Case Study of Industrial Symbiosis to Reduce GHG Emissions: Performance Analysis and LCA of Asphalt Concretes Made With RAP Aggregates and Steel Slags

2020

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The concept of sustainability in the road construction sector is a complex issue because of the various steps that contribute to the production and release of greenhouse gas (GHG) emissions. Addressing this issue, the European Commission has put various policy initiatives in place to encourage the construction industry to adopt circular economy (CE) and industrial symbiosis (IS) principles e.g., the use of recycled materials. Cooperativa Trasporti Imola (CTI), a company located in the Emilia-Romagna region (Italy), has been chosen for the current case study to examine practices, management, and the industrial symbiosis network among various companies in the road construction and rehabilitation sector. In this regard, the use of steel slags, obtained by an electric arc furnace (EAF), and reclaimed asphalt pavement (RAP), obtained by the deconstruction and milling of old asphalt pavement have been investigated. Two mixtures of recycled hot Mix Asphalt (HMA) i) were prepared incorporating different recycled material percentages for the wearing and binder course, respectively, ii) were characterized in terms of size distribution, strength modulus and volumetric properties, iii) and finally were compared to the performances of two mixtures entirely designed by virgin materials for the wearing and binder course, respectively. Therefore, the Life Cycle Assessment (LCA) tool was chosen to evaluate the environmental impacts that affect the designed road life cycle. The results show that recycling RAP and EAF slags in a CTI batch plant provides benefits by reducing the consumption of virgin bitumen and aggregates and by reducing CO2eq emissions. Finally, practical implications on the use of recycled materials in new asphalt mixtures from a life cycle and industrial symbiosis perspective are provided.

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Life cycle assessment of roadworks in United Arab Emirates: Recycled construction waste, reclaimed asphalt pavement, warm-mix asphalt and blast furnace slag use against traditional approach

Cited by 77 publications

References 36 publications

Environmental assessment of warm mix asphalt incorporating steel slag and high reclaimed asphalt for wearing courses: a case study

Environmental assessment of warm mix asphalt incorporating steel slag and high reclaimed asphalt for wearing courses: a case study

Rheological, physicochemical, and microstructural properties of asphalt binder modified by fumed silica nanoparticles

A Case Study of Industrial Symbiosis to Reduce GHG Emissions: Performance Analysis and LCA of Asphalt Concretes Made With RAP Aggregates and Steel Slags

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