scholarly journals SuPerPave® Mix Design Method of Recycled Asphalt Concrete Applied in the European Standards Context

2021 ◽  
Vol 13 (16) ◽  
pp. 9079
Author(s):  
Saverio Olita ◽  
Donato Ciampa
Keyword(s):  
Asphalt Concrete ◽  
Asphalt Mixture ◽  
Design Procedure ◽  
Design Guidelines ◽  
Mix Design ◽  
Rheological Characterization ◽  
Critical Temperatures ◽  
Recycled Asphalt ◽  
European Standards

The recycling of road and airport asphalt pavements requires greater reliability of mix design in order to ensure proper rehabilitation and effective reuse of recycled asphalt concrete. Currently, internationally, the most effective mix design procedures for recycled asphalt concrete with RAP (Reclaimed Asphalt Pavement) refer to guidelines developed by SuPerPave<sup>&#xAE;</sup> Mixtures Expert Task Group. In this paper, according to the requirements of the European standard EN 13108, the authors investigated the reliability of the above mix design procedure. In particular, the SuPerPave<sup>&#xAE;</sup> mix design guidelines were applied for dosing components of wearing course layer recycled asphalt mixture and for the determination of PG (Performance Grade) and critical temperatures of binder contained in RAP (RAP binder) and of binder added ex-novo (virgin binder). The experimental research program started from RAM (Reclaimed Aggregate Material) grading characterization and RAP binder content determination. Afterwards, rheological characterization of the RAP binder and selected virgin binder was carried out using the DSR (Dynamic Shear Rheometer) and BBR (Bending Beam Rheometer) devices. This step allowed us to identify the right virgin binder percentages to be added to RAP binder. Then, in compliance with European standards, the mix design study of recycled mixtures was carried out, identifying the necessary granulometric integrations and the virgin-binder-appropriate percentages to be added. In this phase, three different RAP percentages were used: 30%, 40%, and 50%. Finally, the experimental plan was completed with a preliminary mechanical characterization of the studied recycled asphalt mixtures. The results showed that the implemented rational mix design guarantees performance levels of wearing course layer recycled mixtures that are fully in compliance with European standards.

Mitigation of permanent deformation in base layer containing recycled asphalt aggregates

2013 ◽  
Vol 40 (2) ◽  
pp. 181-187 ◽  
Author(s):  
Jean-Pascal Bilodeau ◽  
Guy Doré ◽  
Jonas Depatie
Keyword(s):  
Asphalt Concrete ◽  
Deformation Behaviour ◽  
Permanent Deformation ◽  
Design Procedure ◽  
Base Layer ◽  
Repeated Loading ◽  
Recycled Asphalt ◽  
Thickness Increase ◽  
Permanent Strain ◽  
Pavement Base

The use of recycled asphalt pavement (RAP) aggregates as replacement for new materials in the pavement base weakens the layer in regards to the resistance to permanent deformation under repeated loading. A mechanistic based design procedure is proposed to ensure that base layers containing RAP particles have a similar rutting behaviour to base layers made of virgin aggregates. The design procedure allows calculating an asphalt concrete thickness increase that is based on permanent deformation behaviour of base materials. The calculation approach is based on multistage triaxial permanent deformation tests performed on granular material samples with varied RAP content. The tests allowed proposing an equation that relates permanent strain rate, RAP content, and deviatoric stress, which is the basis of the design procedure. Design charts are proposed to select adequate thickness increase for the asphalt concrete layer according to the expected RAP content in the base layer and asphalt concrete modulus.

Laboratory Study on Cold-Mixtures for Asphalt Pavement

2012 ◽  
Vol 178-181 ◽  
pp. 1361-1364
Author(s):  
Shi Bin Ma ◽  
Li Jie Wang ◽  
Guo Qiang Zhang
Keyword(s):  
Laboratory Study ◽  
Asphalt Concrete ◽  
Resilient Modulus ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Test Methods ◽  
Recycled Asphalt ◽  
Concrete Mixtures ◽  
Mechanistic Analysis ◽  
Cleavage Strength

The main purpose of recycling is to reuse existing pavement material. First this paper reviews the necessary, feasibility and mechanistic analysis of recycled asphalt mixture, then summarizes the findings of a laboratory study to characterize and design recycled asphalt concrete mixtures using different tests. The laboratory tests carried out on the material were conventional test methods including unconfined compressive strength, cleavage strength, resilient modulus and shrinkage properties tests. The results of the laboratory can be taken as reference in design, engineering and further research．

scholarly journals The influence of binder rheological properties on asphalt mixture permanent deformation

2015 ◽  
Vol 10 (1) ◽  
pp. 54-60 ◽  
Author(s):  
Marcin Gajewski ◽  
Dariusz Sybilski ◽  
Wojciech Bańkowski
Keyword(s):  
Permanent Deformation ◽  
Test Procedure ◽  
Asphalt Mixture ◽  
Design Procedure ◽  
Mix Design ◽  
Creep Recovery ◽  
Quality Prediction ◽  
Simple Test ◽  
Bituminous Mixture ◽  
Shear Creep

The main goal of this paper is to propose the performance parameter for binder which is good for quality prediction of asphalt mixture in frame of resistance to permanent deformation (rutting). Additionally, correlation between, proposed by the authors, repeatable shear creep-recovery test carried out on binder and bituminous mixture rutting test is under evaluation. The results are analysed and correlation between the proposed functional parameter and rut depth is shown. Thanks to that it is possible to claim that expensive rutting test procedure can be assisted with simple test carried out in dynamic shear rheometer at the initial mix design procedure.

Effect of Specimen Size on Compaction and Volumetric Properties in Gyratory Compacted Hot-Mix Asphalt Concrete Specimens

1996 ◽  
Vol 1545 (1) ◽  
pp. 126-132 ◽  
Author(s):  
Kevin D. Hall ◽  
Satish K. Dandu ◽  
Gary V. Gowda
Keyword(s):  
Asphalt Concrete ◽  
Hot Mix Asphalt ◽  
Asphalt Mixture ◽  
Design Procedure ◽  
Specimen Size ◽  
Binder Content ◽  
Volumetric Properties ◽  
Strong Trend ◽  
Number Of Factors ◽  
Gyratory Compaction

Gyratory compaction is the centerpiece of the Strategic Highway Research Program asphalt mixture design procedure Superpave. A number of factors could potentially affect the behavior of asphalt mixes in the gyratory compactor. One of these is specimen size. Four specimen sizes each of one unmodified and two rubber-modified hot-mix asphalt concrete mixes were compacted in the Superpave gyratory compactor to determine the effect of specimen size on compaction and volumetric properties of the mixes. All specimens were compacted using a 150-mm-diameter mold. Specimens of each of the mix types were prepared using three gradations and three binder contents. Densification curves and plotting number of gyrations versus percent of theoretical maximum density were developed for each mix type/gradation/binder content combination. A strong trend in the densification data was observed, in which curves representing specimen sizes of 3500, 5000, and 6500 g were grouped together, apart from the curve representing a 2000-g specimen size. This trend, the grouping of larger specimen data apart from small specimen data, was also observed in volumetric data (optimum asphalt content, voids in mineral aggregate, and voids filled with asphalt). These trends were observed in most of the mix type/ gradation/binder content combinations. The data presented suggest that for specimens of sufficient size, for example, greater than 3500 g, specimen size does not significantly affect the volumetric or compaction properties of hot mix specimens, which supports the ruggedness of the gyratory compaction procedure.

Rheological Characterization of Asphalt Concrete Using a Shear Box

2013 ◽  
Vol 41 (4) ◽  
pp. 20120177 ◽  
Author(s):  
Safwat F. Said ◽  
Hassan Hakim ◽  
Olle Eriksson
Keyword(s):  
Asphalt Concrete ◽  
Rheological Characterization ◽  
Shear Box

scholarly journals Chemical recycling of polyethylene terephthalate (waste water bottles) for improving the properties of asphalt mixture

2018 ◽  
Vol 162 ◽  
pp. 01042 ◽  
Author(s):  
Mohammed Alzuhairi ◽  
Ahmed Al-Ghaban ◽  
Shams Almutalabi
Keyword(s):  
Polyethylene Terephthalate ◽  
Asphalt Concrete ◽  
Asphalt Mixture ◽  
Mix Design ◽  
Engineering Properties ◽  
Chemical Recycling ◽  
Air Voids ◽  
Concrete Mixtures ◽  
Penetration Tests ◽  
Property Modification

One of the most prevalent of waste materials is Polyethylene Terephthalate (PET) which is used mainly to produce the drinking water bottles. In this research, the waste plastic bottles, which are normally made from PET was used to investigate the possibility of using this material as an additive in asphalt concrete mixtures. Six different proportions (w/w %) of Degradated Polyethylene Terephthalate (DPET) (2, 4, 6, 8, 10, and 12%) have been added to bitumen to prepare the specimens. The tests include Marshall Method of mix design and coating with asphalt. The results indicated that the mixture property modification increased as the content of (DPET) increases. This additive gives maximum flexibility and rigidity of the asphalt, according to ductility and penetration tests. Marshall Method gives better resistance against permanent deformations and better engineering properties in terms of stability, flow value, air voids and water absorption comparing with non-modified mixtures.

Engineering characterization of recycled asphalt concrete and aged bitumen mixed recycling agent

2007 ◽  
Vol 42 (23) ◽  
pp. 9867-9876 ◽  
Author(s):  
J. S. Chen ◽  
C. C. Huang ◽  
P. Y. Chu ◽  
K. Y. Lin
Keyword(s):  
Asphalt Concrete ◽  
Recycled Asphalt ◽  
Recycling Agent
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