Design of hot-mix recycled asphalt concrete produced in plant without preheating the reclaimed material

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

doi:10.1080/10298436.2011.587009

Cited by 18 publications

(12 citation statements)

References 5 publications

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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%

“…The most common mechanical properties of hot-mix asphalt with RAP, e.g., stiffness, resistance to fatigue cracking and rutting, tend to be better or at least equal to the characteristics of a traditional mixture [8,59,88].…”

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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Section: Reclaimed Asphalt Pavement (Rap)mentioning

confidence: 65%

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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“…When RHMA mixture is produced in an AMP, cold and wet RAP is dried and heated up to break them down into separate component particles, which could absorb thin films of a rejuvenator on their surface. RAP may dry out and heat up in two technological ways of heat transfer: first, ( Figure 3A,B,D technologies) without preheating the reclaimed material [46], when RAP take over some of the heat of aggregates (superheated virgin materials, superheating temperature) in contact with superheated aggregates; second, (Figure 3C technology) the flow of RAP is dried and heated up (up to 100-110 • C) in a separate parallel dryer, where a mixture of heated up gas and air is emanated from a burner [47].…”

Section: Model Of Technologies Of Rap Recyclingmentioning

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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“…When producing mixtures with reclaimed asphalt pavement (RAP), aged and virgin bitumens are mixed. To maintain mechanical and physical properties of the recycled mixture, RAP quantity, homogeneity, mark of the aged and virgin bitumens, their penetration, quantity of virgin bitumen should be taken into account (Čygas et al 2011;Baptista et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Dependences of Sma Mixture and Its Bituminous Binder Properties on Bitumen Batching System, Mixing Time and Temperature on Asphalt Mixing Plant

Bražiūnas

Sivilevičius

Virbickas³

2013

Journal of Civil Engineering and Management

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Bitumen holds the aggregate in hot mix asphalt (HMA). Without asphalt binder, HMA would simply be crushed stone or gravel. A bitumen batching system (BBS) is comprised of bitumen storage, transportation, weighing and discharge equipment in an asphalt mixing plant (AMP). The function of the equipment is to batch the binder heated up to working temperature and to discharge it into a mixer in batches. In the entire system, the binder is exposed to high temperature and oxygen. Bitumen is slowly oxidized when it is in contact with oxygen. The degree of oxidation is highly dependent on temperature, time and thickness of a bitumen film. This article models the key factors influencing on the dynamics of bitumen oxidation in BBS equipment. Stone mastic asphalt (SMA) mixture was produced from the same materials according to the same job-mix formula (JMF) in neighbouring batch type AMP by changing the mixing time of materials from 20 to 60 s. Bitumen binder was separated from the taken SMA samples and its gradation was identified. Thus, Marshall specimens were produced and tested. Penetration Pen 25 of bitumen binder recovered in rotary evaporator, softening point T sp was determined and penetration index I p was calculated. The presented findings of experimental investigation show that the properties of bitumen binder in BBS working at two different technologies changed inconsistently. Due to gravitation, the bitumen intensively flowing into a mixer (BBS1) is impacted by oxidation more than the bitumen batched by a high-pressure pump (BBS2).Keywords: bitumen; hot mix asphalt (HMA); stone mastic asphalt (SMA); bitumen batching system (BBS); job-mix formula (JMF); oxidation, short-term ageing; rheology; penetration; viscosity; asphalt mixing plant (AMP).Reference to this paper should be made as follows: Bražiūnas, J.; Sivilevičius, H.; Virbickas, R. 2013. Dependences of SMA mixture and its bituminous binder properties on bitumen batching system, mixing time and temperature on asphalt mixing plant, Journal of Civil Engineering and Management 19(6): 862-872. http://dx.. Research interests: flexible pavement life-cycle, hot mix asphalt mixture production technology, application of statistical and quality control methods, recycling asphalt pavement technologies and design, decision-making and expert systems theory.Romualdas VIRBICKAS. Quality Control manager of JSC "Fegda", Vilnius. Research interests: research and application of new technologies of roads, urban streets and airport pavements construction, design of roads, urban streets and airport pavements, project and structure inspection, maintenance inspection of roads and urban streets. 872 J. Bražiūnas et al. Dependences of SMA mixture and its bituminous binder properties on bitumen batching system ... Downloaded by [Tufts University] at 12:01 04 November 2014

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Design of hot-mix recycled asphalt concrete produced in plant without preheating the reclaimed material

Cited by 18 publications

References 5 publications

Feasibility Assessment of the Use of Recycled Aggregates for Asphalt Mixtures

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

Dependences of Sma Mixture and Its Bituminous Binder Properties on Bitumen Batching System, Mixing Time and Temperature on Asphalt Mixing Plant

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