Feasibility study of milled and crushed reclaimed asphalt pavement for application in unbound granular layers

Freire, Ana Cristina; Neves, José; Roque, António José; Martins, Isabel M.; Antunes, Maria de Lurdes

doi:10.1080/14680629.2019.1701539

Cited by 13 publications

(6 citation statements)

References 46 publications

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“…This suggests that the reliance on natural aggregates in geotechnical applications is high and the inclusion of recycled aggregates can contribute significantly to preserve the environment. In view of the above, several studies have recently been conducted to evaluate the feasibility of using recycled C&D wastes in diverse geotechnical applications, such as ground improvement works [8,9], pipe bedding and backfilling [10,11], construction of paved and unpaved roads [12][13][14][15][16][17][18] and backfilling of geosynthetic-reinforced structures [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…Most of the studies carried out on recycled aggregates from C&D waste are related to recycled concrete aggregates [9,10,14,23] or reclaimed asphalt pavement materials [16,17]. However, particularly in Southern European Countries, C&D wastes sent out at the recycling plants are mainly mixed wastes (comprising concrete, mortars, stones, ceramics,).…”

Section: Introductionmentioning

confidence: 99%

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Pullout Behaviour of Geogrids Embedded in a Recycled Construction and Demolition Material. Effects of Specimen Size and Displacement Rate

et al. 2020

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In recent years, environmental concerns related to the overexploitation of natural resources and the need to manage large amounts of wastes arising from construction activities have intensified the pressure on the civil engineering industry to adopt sustainable waste recycling and valorisation measures. The use of recycled construction and demolition (C&D) wastes as alternative backfill for geosynthetic-reinforced structures may significantly contribute towards sustainable civil infrastructure development. This paper presents a laboratory study carried out to characterise the interaction between a fine-grained C&D material and two different geogrids (a polyester (PET) geogrid and an extruded uniaxial high-density polyethylene (HDPE) geogrid) through a series of large-scale pullout tests. The effects of the geogrid specimen size, displacement rate and vertical confining pressure on the pullout resistance of the geogrids are evaluated and discussed, aiming to assess whether they are in line with the current knowledge about the pullout resistance of geogrids embedded in soils. Test results have shown that the measured peak pullout resistance of the geogrid increases with the specimen size, imposed displacement rate and confining pressure. However, the pullout interaction coefficient has exhibited the opposite trend with the specimen size and confining pressure. The pullout interaction coefficients ranged from 0.79 and 1.57 and were generally greater than or equal to the values reported in the literature for soil-geogrid and recycled material-geogrid interfaces.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pullout Behaviour of Geogrids Embedded in a Recycled Construction and Demolition Material. Effects of Specimen Size and Displacement Rate

et al. 2020

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“…In addition, there is a high potential for using CDW as Ras in concrete production because most of its components have a high resource value. Several studies [3,4] have shown positive results for using RAs in structural concrete and road construction [5]. The advantages of using RAs can be summarised as: (i) it reduces the production of NAs and preserves natural resources; (ii) it minimises the emission of CO 2 into the air and the costs of construction materials, especially for short-distance transportation scenarios; (iii) it preserves lands instead of landfilling them and decreases the need for new landfills, thus also leading to savings in costs; (iv) it offers more employment opportunities in the recycling industry [6].…”

Section: Introductionmentioning

confidence: 99%

Environmental and Economic Comparison of Natural and Recycled Aggregates Using LCA

Dias¹,

Nezami

Silvestre

et al. 2022

Recycling

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Recycled aggregates (RAs) have been playing an important role in replacing natural aggregates (NAs) in concrete production, thereby contributing to a reduction in the extraction of natural resources and the promotion of a circular economy. However, it is important to assess the global impacts of this replacement, in both environmental and economic terms. In this study, an overview of the impacts of the production of natural and recycled aggregates is presented, using the life cycle assessment (LCA) methodology. Through this methodology, products with the same function are compared and information about the best solutions is given, considering their environmental and economic impacts. Studies with data collected from specific producers were compared, as well as environmental product declarations (EPDs) and generic databases, regarding the production of natural and recycled, coarse and fine, and rolled and crushed aggregates. This study intends therefore to provide the environmental and economic impact comparison at the global level through LCA from different data sources. According to this literature review, the best and worst environmental results are assigned to lower and higher transport distances, respectively. Regarding EPDs, the lowest environmental impacts are related to recycled coarse aggregates and the highest to natural coarse crushed aggregates. In terms of generic databases, the results are similar, with the lowest impacts associated with natural fine rolled aggregates and the highest to natural coarse crushed aggregates. In what concerns the economic impacts, in general, recycled aggregates are associated with the lowest costs. However, these results are highly dependent on transport distances and costs.

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“…[ 19 , 20 , 21 ]. Some of these studies conclude that chromium and sulphate are amongst the most critical components [ 11 , 22 , 23 , 24 ]. It is possible to compare the content of analytes released from RAs, based on their concentration in the eluate, with legal limit values, allowing for example their classification for landfill disposal for inert, non-hazardous or hazardous waste [ 11 , 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

Ecotoxicity of Recycled Aggregates: Application of a Prediction Methodology

et al. 2022

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Due to environmental concerns, the search for sustainable construction solutions has been increasing over the years. This global concern is creating a trend in the use of recycled aggregates resulting from construction and demolition wastes from different sources. In addition to their physical and mechanical properties, it is important to analyse their ecotoxicological risk to determine whether their leachates might be an issue. To assess ecotoxicity, biological tests should be performed for different trophic levels. This type of test is expensive and needs a high level of expertise, which leads to a lack of studies on recycled aggregates including ecotoxicity analysis. This paper presents a set of predictive ecotoxicity results based on the published studies on recycled aggregates. These results are the outcome of applying an innovative methodology previously developed and validated by the authors aiming to foresee the ecotoxicological fate of building materials’ constituents and products. The application of this methodology enables the classification of a recycled aggregate product as safe or unsafe in terms of ecotoxicity risk, while keeping biological testing to a minimum.

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Feasibility study of milled and crushed reclaimed asphalt pavement for application in unbound granular layers

Cited by 13 publications

References 46 publications

Pullout Behaviour of Geogrids Embedded in a Recycled Construction and Demolition Material. Effects of Specimen Size and Displacement Rate

Pullout Behaviour of Geogrids Embedded in a Recycled Construction and Demolition Material. Effects of Specimen Size and Displacement Rate

Environmental and Economic Comparison of Natural and Recycled Aggregates Using LCA

Ecotoxicity of Recycled Aggregates: Application of a Prediction Methodology

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