Laboratory and field evaluation of cold recycling mixture with foamed asphalt

Guatimosim, Frederico V.; Vasconcelos, Kamilla; Bernucci, Liedi Légi Bariani; Kj, Jenkins

doi:10.1080/14680629.2016.1261726

Cited by 60 publications

(17 citation statements)

References 8 publications

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“…In other words, the original particles of >19 mm in the RAP materials can basically be regarded as a particle group composed of a plurality of particles of different particle sizes, and the particles still rely on the bonding effect of old asphalt, the particles of <0.15 mm in the RAP materials are basically bonded to the particles of various particle sizes to form a particle group. Therefore, when the RAP materials are used for recycling, the performance of the recycled mixture depends not only on the new binder added, but also on the performance of the aged binder in the RAP lump [30]. Figure 5 shows the analysis results of the specific surface area of RAP materials.…”

Section: Asphalt Content Basic Properties and Aggregates Gradationsmentioning

confidence: 99%

Performance Evaluation of Recycled Asphalt Pavement Materials and Cold Recycling Mixtures Designed with Vibratory Compaction Method

et al. 2019

Applied Sciences

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In this paper, the basic composition and performance evaluation of the recycled asphalt pavement (RAP) materials were firstly analyzed, and two methods were proposed to evaluate strength characteristics of RAP materials, including a triaxial method for the residual strength and the mortar cementing method for the strength of RAP lump. Then, the cold recycling technology was applied on RAP materials with emulsified asphalt by using vibratory compaction and heavy-duty compaction methods (Proctor compaction method), and the results showed that the maximum dry density obtained by heavy-duty compaction was closer to the actual situation. Finally, the effects of wetting water, emulsified asphalt dosage and curing conditions on the performance of the specimens were investigated. It was found that when the emulsified asphalt was mixed uniformly, whether or not to add the wetting water have almost no effect on the strength of the molded specimens. When the matrix asphalt content of the emulsified asphalt was 30%~60%, the water could be directly added to the cold recycling mixture. The intensity of accelerated curing for two days at 40 • C was approximately equal to that of natural curing for three days, while that of accelerated curing for three days at 40 • C was approximately equal to that of natural curing for seven days, which provided a basis for the short-term laboratory test. emulsion content, aggregate properties, coating and adhesion tests. Strength testing mainly refer to the indirect tensile strength test, in addition to resistance, moisture-induced damage sensitivity test and rutting test [7]. A. Widayanti et al. used SEM imaging technology to observe the morphology and surface texture of the RAP materials [8]. Also, Y. N. Li et al. evaluated the effects of emulsified asphalt and cement on the porosity, indirect tensile strength, tensile strength ratio, dynamic stability and mechanical properties of RAP materials [9]. X. Zhang made an in-depth research on the RAP materials treatment process from four aspects: Method of recycling RAP materials, selection of crushing equipment, old material screening process, storing and testing [10]. F. Ye et al. researched the layered aging regulation of asphalt stratification on the surface of RAP materials [11]. T. Ma et al. researched the effects of aging properties in asphalt on the performance of 48 RAP materials by measuring the low temperature performance of mortar with bending beam 49 rheometer (BBR) [12].However, there has not been a uniform conclusion on the research of RAP materials compaction methods abroad. Some of the compaction methods are mainly selected according to different design methods of recycling asphalt mixtures. Generally, the Marshall compaction method is used to mold specimens for the Marshall design method. The kneading method is used for Hveem method. The gyratory compaction method is used for Superpave design method, which is more popular in the U.S. and Sweden [13][14][15].H. Y. Wei et al. used the method of vibration compaction specimens and de...

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Section: Asphalt Content Basic Properties and Aggregates Gradationsmentioning

confidence: 99%

Performance Evaluation of Recycled Asphalt Pavement Materials and Cold Recycling Mixtures Designed with Vibratory Compaction Method

et al. 2019

Applied Sciences

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“…Bitumen emulsion, foamed bitumen in specific proportions are used rather often as regenerating binding materials. Portland cement, fly ash, unhydrated lime are added with the purpose to increase stability of cold mixtures, to obtain more optimum structural characteristics of concrete which is prepared on their basis for road pavement [1][2][3][4].…”

Section: Cold Recyclingmentioning

confidence: 99%

Recycling of Materials for Pavement Dressing: Analytical Review

et al. 2019

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The paper presents an analytical review of materials recycling for pavement dressing. Recycling or repeated usage of pavement dressing materials while making reconstruction and repair of road pavements is not considered as a new conception and it has been realized in various countries of the world since 20th century. Recycling (hot, cold) is based on methods of its execution, properties of pavement dressing materials which are subjected to processing and which influence on the quality of final material, technical and operational indices, specific economic efficiency. Investigations on the processes of structure formation, thermo-physical properties in components based on granulates of transformed pavement dressings during recycling demonstrate that regeneration makes it possible to attain 100 % recovery of material properties for road pavement base. The paper describes other factors which represent a complex of challenges concerning exterior and internal problems. These problems have arisen due to actual processes of heat and mass transfer in one layer, multi-layer systems of pavement dressings. At known coefficients of heat conductivity, steam- and mass permeability, diffusion, filtration, temperature conductivity, density of material layers etc. initial and boundary conditions it is possible to carry out optimization of heat- and mass transfer problems from bottom surface of road layer to its base (sand, bulk materials, ground). In addition to it, while taking into account development of scientific prospective direction that concerns nano-technology and creation of nano-materials for higher reliability of road dressings it is necessary to consider nanomaterial science in road-construction industry as the most actual one because when we study problems pertaining to fractional composition of all road dressing components including transfer to nanomaterials, for example, application of modified water-reducing agent based on nanostructured carbon it is possible significantly to increase physical and technological properties of asphalt concrete and concrete road dressings. The paper reveals that it is necessary to continue and expand study of physical and technical and thermophysical properties of new materials on the basis of nano-technologies with application of modified, nanostructured carbon-based plasticizer for construction-road industry because especially these additives significantly increase cement activity that leads to improvement of strength, reliability and longevity for the obtained materials.

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“…The recycling is hot if all constituents in the mixture are heated; the process is cold if at least the aggregates are not heated. Several researches were carried out to develop the incorporation of AA in new asphalt mixtures [1][2][3][4][5][6], in foamed asphalts [7][8][9] or in bitumen emulsions [10][11][12]. This work studies the possibility of cold recycling without binder addition by means experimental and model methods commonly used for Unbound Granular Materials (UGM).…”

Section: Introductionmentioning

confidence: 99%

“…The followed equations define mean stress p*, deviator stress s*, volumetric strain εv and deviatoric strain εq used in the Boyce model. p* = (γσ1+2σ3)/3(8)…”

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confidence: 99%

Study of the mechanical behaviour of reclaimed asphalt aggregates without binder addition

Gaillard

Chazallon

Huard³

et al. 2019

E3S Web Conf.

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The objective of this paper is to investigate a source of reclaimed asphalt aggregates without binder addition. To this end, a series of triaxial tests was performed. First, monotonic triaxial tests allowed to determine failure resistance of the material at 20°C, 50°C and at 20°C with a prior preheating at 50°C. Then, the resilient and permanent behaviours at 20°C were studied thanks to Repeated Load Triaxial (RLT) tests with different levels of loading. The results show that increasing the temperature test implies a drop of failure resistance but a higher cohesion. RLT tests reveal a stress dependent resilient behaviour. Finally, the experimental results were compared with calibrations of the non-linear elastic Boyce model.

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Laboratory and field evaluation of cold recycling mixture with foamed asphalt

Cited by 60 publications

References 8 publications

Performance Evaluation of Recycled Asphalt Pavement Materials and Cold Recycling Mixtures Designed with Vibratory Compaction Method

Performance Evaluation of Recycled Asphalt Pavement Materials and Cold Recycling Mixtures Designed with Vibratory Compaction Method

Recycling of Materials for Pavement Dressing: Analytical Review

Study of the mechanical behaviour of reclaimed asphalt aggregates without binder addition

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