A review of thermal processes in the production and their influences on performance of asphalt mixtures with reclaimed asphalt pavement (RAP)

Zhang, Kun; Huchet, Florian; Hobbs, Andrew M.

doi:10.1016/j.conbuildmat.2019.02.057

Cited by 56 publications

(15 citation statements)

References 52 publications

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“…During the research, it was also noticed that there are many other important factors, like temperature, that affect the mobilization rate. However, the mechanisms of the thermal production conditions and their influences on the performance of RAP mixtures are not well understood [42]. For example, Ma et al [43] found out that increasing the heating temperature of RAP is not always an effective method to improve the compactability of recycled HMA.…”

Section: Literature Reviewmentioning

confidence: 99%

The Correlation between the Number of Asphalt Mixing Plants and the Production of Asphalt Mixtures in European Countries and the Baltic States

2021

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The transport infrastructure’s pavement is made of asphalt layers, placed and compacted. The asphalt mixture is produced in an asphalt mixing plant (AMP) using expensive technological equipment which, when it becomes obsolete and worn out, is replaced with new equipment. One of the main problems related to the replacement process is that when it comes to purchasing new AMPs, the decision making involved is, in most cases, highly intuitive due to a lack of clearly defined criteria. In order to remedy this situation, this work presents an analysis of the correlation between the number of AMPs and the production of asphalt mixtures. Firstly, a correlation analysis was performed based on the European Asphalt Pavement Association (EAPA) data. Secondly, the current situation with the AMPs in European countries was analysed. Furthermore, a case study was performed and a system of nine criteria was created to identify why/when road construction companies operating in the Baltic States buy new AMPs. The weights of the criteria have been established by applying the Analytic Hierarchy Process (AHP) method. It was found that the most important criterion during the decision-making process for road construction companies is increased requirements for improving the quality of the asphalt mixture produced (criteria weight 25.0%). With a weight of 20.6%, the second vital criterion is the possibility of receiving support from European funds. The third criterion is the expectation of having a sizeable asphalt-paving site (weight 20.4%). The other six criteria are also significant, their weights varying between 1.6% and 13.5%. The industrial companies can use the obtained results for designing, producing and selling AMPs and adjusting strategic business plans.

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Section: Literature Reviewmentioning

confidence: 99%

The Correlation between the Number of Asphalt Mixing Plants and the Production of Asphalt Mixtures in European Countries and the Baltic States

2021

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“…In the context of energy saving and emission reduction, reclaimed asphalt pavement (RAP) has been increasingly used in highway construction [1,2]. In some hot and rainy areas, the rejuvenating agent is usually not added to hot-mixed renewable asphalt mixture (HRM) [3], because asphalt mixture in these areas does not need great low-temperature performance, and the bitumen that becomes hard and brittle after aging helps to improve high-temperature stability [4,5]. However, the high temperature and rainy conditions require better water stability and viscoelasticity properties of the asphalt mixture.…”

Section: Introductionmentioning

confidence: 99%

Influence of Hydrodynamic Pore Pressure Damage on the Performance of Hot-Mixed Renewable Asphalt Mixture

Zeng¹,

Li²,

Yang³

et al. 2023

Journal of Renewable Materials

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For evaluating the water stability of hot-mixed renewable asphalt mixture (HRM), the traditional methods are all tested under still water conditions. Except for damage in still water conditions, the hydrodynamic pore pressure generated by the tire driving on the surface water has a great impact. Thus, the RAP contents of the HRMs were designed at 0%, 30%, 45% and 60% with AC-25 gradation. Then, the self-designed evaluation methods of water stability and dynamic modulus were studied. Finally, the mechanism of the influence of hydrodynamic pore pressure damage on HRMs was studied. The results show that the water stability of HRM containing 30% RAP is equivalent to that of 45% RAP, and the water stability of HRM containing 60% RAP decreases significantly. The Contabro test after MIST treatment can be used as an evaluation method for hydrodynamic pore pressure damage on HRM. Low-speed, heavy-load traffic and larger RAP content have greater damage to the mixture after hydrodynamic pore pressure damage. The performance differences between the aged bitumen and pure bitumen, as well as the aged minerals and new minerals, are continuing to be enlarged in hydrodynamic pore pressure conditions, finally affecting the water stability and dynamic modulus of the HRMs.

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“…Principles of asphalt pavement recycling (Sivilevičius et al 2017) indicates, that it should be formed into small (maximum size from 22 to 32 mm) RAP particles (Nguyen 2013), which heated in an asphalt mixing plant, decompose into individual unbound particles covered with old bitumen films (Zhang et al 2019;Hossain et al 2015). When they interact with the dosed rejuvenator, the viscosity of the old bitumen is reduced during the mechanical and diffusive mixing process and its other properties are restored to those suitable for repetitive use in the recycled asphalt mix (Wang et al 2019;Ržek et al 2020;Shirodkar et al 2011;Zaumanis et al 2014aZaumanis et al , 2014bZaumanis et al , 2019Zaumanis et al , 2020.…”

Section: Introductionmentioning

confidence: 99%

Field Investigation and Assessment on the Wear of Asphalt Pavement Milling Machine Picks

Sivilevičius

Martišius

2022

Transport

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Deteriorated asphalt pavement material is recycled applying proved technologies based on scientific principles and practical experience. The asphalt pavement layer during rehabilitation process is loosened by a mobile transport machine fracturing into the required material grading and called Reclaimed Asphalt Pavement (RAP). RAP is extracted while cutting asphalt chip in required depth at optimal speed by mean of changeable picks installed in a toolholder of milling machine rotating drum. During interaction with the asphalt pavement to be demolished, the wear of picks appears, and the dimensions of their elements decrease. Methodology and results of a field experimental research allowed statistically to determine and evaluate the wear dynamics of picks from 2 manufacturers are provided in this paper. The results provide that length of pick, diameter of carbide tip and diameter of steel body of picks from these manufacturers were decreasing proportionally to milled asphalt pavement surface. Applying the Fisher’s criterion it was found that the variances of the reduction of these geometrical parameters are the same and they satisfy the normal distribution according to the Kolmogorov’s criterion. All values of Student’s criterion calculated statistics were higher than the critical values, which indicated that the wear intensiveness of the picks of the 2 manufacturers differed significantly. These data can be used to select suitable picks for the milling machine according to their wear intensity.

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A review of thermal processes in the production and their influences on performance of asphalt mixtures with reclaimed asphalt pavement (RAP)

Cited by 56 publications

References 52 publications

The Correlation between the Number of Asphalt Mixing Plants and the Production of Asphalt Mixtures in European Countries and the Baltic States

The Correlation between the Number of Asphalt Mixing Plants and the Production of Asphalt Mixtures in European Countries and the Baltic States

Influence of Hydrodynamic Pore Pressure Damage on the Performance of Hot-Mixed Renewable Asphalt Mixture

Field Investigation and Assessment on the Wear of Asphalt Pavement Milling Machine Picks

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