Assessment of the Use of Hot-Mix Recycled Asphalt Concrete in Plant

Picado-Santos, Luís; Baptista, António; Capitão, Silvino

doi:10.1061/(asce)te.1943-5436.0000190

Cited by 22 publications

(12 citation statements)

References 4 publications

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“…The figure show that control mixture is the one with the highest fatigue life, since the asphalt present in the mixture is the softest and the mixture were more flexible. Therefore, showing a better fatigue resistance, these results agreeable with the results of (Silva et al, 2012); however, this results inconsistent with the results of (Huang et al, 2004) and (Santos et. al., 2010).…”

Section: Fatigue Propertiescontrasting

confidence: 53%

Effects of Level of Reclamation on the Properties of Hot Mix Asphalt Concrete

Abdul-Mawjoud¹,

Ismaeel²

2015

IJSRK

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Abstract. The present study was conducted on Reclaimed Asphalt Pavement (RAP) to assess the optimum blending ratio with new material for possible use in road construction and maintenance. It was planned to use reclaimed materials from one of the streets of the city of Mosul in Iraq, after mixing with the new material (asphalt grade (50-60), filler and aggregate) for binder course construction. Optimum asphalt content was obtained using Marshall Method through the preparation of a mixture of new material and uses this value in the preparation of recycled mixtures. Five percentages of RAP, namely, (0%, 20%, 30%, 50% and 100%) have been implemented. A total of (155 Marshall, 75 beam) specimens, and 10 slab samples were prepared in this study. Many tests were used to assist the performance of the HMA samples, these tests includes: Marshall characteristics, indirect tensile strength at 25˚C, 60˚C, flexural strength at 0˚C, -10˚C, cohesion resistance, static creep at 25˚C, 40˚C, fatigue resistance and rutting resistance. Results indicate that using RAP up to 50% is feasible, and it can improve asphalt mixture properties and its performance, while 30% is considered the ideal ratio since it showed better performance in all tests except for the fatigue where shorter fatigue life was observed.

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Section: Fatigue Propertiescontrasting

confidence: 53%

Effects of Level of Reclamation on the Properties of Hot Mix Asphalt Concrete

Abdul-Mawjoud¹,

Ismaeel²

2015

IJSRK

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“…The tendency is trying to increase the incorporation rate of RAP in asphalt mixtures. The use of RAP in rates around 35% is frequent, as is reported in several studies [8,58,59], but there is a tendency to increase this percentage up to 100% [60][61][62].…”

Section: Reclaimed Asphalt Pavement (Rap)mentioning

confidence: 65%

“…The authors can declare, based on their own previous experience, that up to 40% of RAP (by total weight) can be incorporated in the production process in a conventional batch plant just by premixing RAP and new aggregates 20 s before adding the new binder [86,87]. Adding RAP in a plant allow a better control of the process, increasing the level of confidence on expected properties of the final blend and allowing a mechanical performance comparable to that of similar mixtures produced without RAP [2,8,59].…”

Section: Asphalt Mixtures With Rapmentioning

confidence: 99%

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Feasibility Assessment of the Use of Recycled Aggregates for Asphalt Mixtures

2018

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The use of recycled aggregates, manufactured from several by-products, to replace virgin aggregates in the production of pavement asphalt mixtures needs to be encouraged. Nevertheless, there are some concerns and uncertainties about the actual environmental, economic and mechanical performance resulting from the incorporation of recycled aggregates in asphalt mixtures. Therefore, this paper has the goal of discussing important features to help decision makers to select recycled aggregates as raw materials for asphalt mixtures. Based on the literature review carried out and the own previous experience of the authors, the article's main findings reveal that incorporating some of the most common recycled aggregates into asphalt mixtures is feasible, even in a life-cycle analysis perspective. Although some specific technical operations are sometimes necessary when using recycled aggregates in asphalt mixtures, some benefits in terms of environmental impacts, energy use and costs are likely to be achieved, as well as in what concerns the mechanical performance of the asphalt mixtures.

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“…Most laboratory studies have demonstrated evidence that high RAP pavements can achieve the desired pavement performance and longevity that are equal to conventional asphalt [8][9][10]. Adequate mix design procedures can even allow for creating mixtures containing 100% recycled asphalt [11,12]. It has also been confirmed that adequate full-scale RAP management, production, and mix design procedures can lead to excellent field results.…”

mentioning

confidence: 99%

Technologies and Principles of Hot Recycling and Investigation of Preheated Reclaimed Asphalt Pavement Batching Process in an Asphalt Mixing Plant

2017

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More and more recycled asphalt mixtures with high reclaimed asphalt pavement (RAP) content are used in road pavement. Having determined and evaluated RAP composition (aged bitumen content and aggregate gradation) and properties, a suitable recycling agent and virgin materials are selected in the design process. The gradation of hot mix asphalt (HMA) mixture that is recycled in an asphalt mixing plant (AMP) shall correspond to its optimal gradation set out in its job-mix formula (JMF). When RAP is recycled in an AMP, inevitable systematic and random errors of performed technological operations and inhomogeneity of virgin materials and RAP have a significant influence. These factors influence the variation of components quantities of recycled hot mix asphalt (RHMA) mixture and deviations from JMF. In this study, the principles of asphalt pavement hot recycling are systematized, which allows analysis of the factors of components' interaction influencing the results of the recycling process. The paper also presents and analyses asphalt recycling technologies in AMP and their comparative analysis. During the season of asphalt mixture production in 2014, statistical parameters were calculated according to the data obtained from one of the companies, which collected and systematized RAP batch masses, when before batching it was pre-dried and pre-heated in an additional dryer. These parameters of batch mass and RAP content in RHMA position and variation were used when evaluating the accuracy and precision of the recycling process in AMP. The obtained data showed that when RHMA mixtures are produced in a modern batch-type AMP, RAP is batched accurately, but not precisely enough.

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Assessment of the Use of Hot-Mix Recycled Asphalt Concrete in Plant

Cited by 22 publications

References 4 publications

Effects of Level of Reclamation on the Properties of Hot Mix Asphalt Concrete

Effects of Level of Reclamation on the Properties of Hot Mix Asphalt Concrete

Feasibility Assessment of the Use of Recycled Aggregates for Asphalt Mixtures

Technologies and Principles of Hot Recycling and Investigation of Preheated Reclaimed Asphalt Pavement Batching Process in an Asphalt Mixing Plant

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