The theoretical analysis of the RAP aged asphalt influence on the performance of asphalt emulsion cold recycled mixes

Yan, Jinhai; Zhu, Hehua; Zhang, Zhixiang; Gao, Lei; Charmot, Stephane

doi:10.1016/j.conbuildmat.2014.09.002

Cited by 43 publications

(16 citation statements)

References 19 publications

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“…According to results, as already known, the presence of RAP and bitumen emulsion confer a reduction of ITS values if compared to a high-modulus HMA for base layer (-43 %). These results are strictly related to the mix design and to the quality of RAP and its aged bitumen (Yan et al, 2014). However, the ITS resistance for CRM is higher than ITS limit (0.35 MPa) imposed by some Italian technical specification for Cold Mix Asphalt for base layer.…”

Section: Indirect Tensile Strength Results Analysismentioning

confidence: 85%

A laboratory and filed evaluation of Cold Recycled Mixture for base layer entirely made with Reclaimed Asphalt Pavement

Sangiorgi

Tataranni

Simone

et al. 2017

Construction and Building Materials

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Asphalt concrete (AC) recycling is probably the most cost-effective technique for the rehabilitation of stressed road pavements and for the construction of new ones. The increased interest in this technology comes from the need of reducing the costs connected to the production processes and to the use of virgin raw materials. In fact, the benefits connected to the use of Reclaimed Asphalt Pavement (RAP) are related to the possibility of substituting the natural aggregates and the virgin binder of an AC mixture, without negatively affecting its mechanical properties. When this process is made at ambient temperature (Cold Recycled Mixes-CRM), more advantages are brought about with, above all, the reduction in energy consumption and emissions during in plant production and laying, in addition to the actual possibility of achieving durable pavement layers. A CRM totally made of RAP is proposed in this research, the main goal of which was to evaluate the different physical and mechanical characteristics derived by the large use of recycled materials. According to the final mix-design, CRM does not show significant differences in terms of physical properties, when compared to a Hot Mix Asphalt (HMA) for base layers. Moreover, even if the experimental mixture *Manuscript Click here to view linked References

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Section: Indirect Tensile Strength Results Analysismentioning

confidence: 85%

A laboratory and filed evaluation of Cold Recycled Mixture for base layer entirely made with Reclaimed Asphalt Pavement

Sangiorgi

Tataranni

Simone

et al. 2017

Construction and Building Materials

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“…To successfully use cold recycling for asphalt pavements, a lot of researches have been conducted on the mix design method and evaluation of mechanical properties of cold recycled asphalt mixtures. Based on previous research findings [8][9][10][11][12][13], the "black rock" theory is the basis for current design of cold recycled asphalt mixtures. The asphalt binder in RAP is usually ignored and RAP plays a single role of aggregate.…”

Section: Introductionmentioning

confidence: 99%

Strength Mechanism and Influence Factors for Cold Recycled Asphalt Mixture

Wang

Huang

2015

Advances in Materials Science and Engineering

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This study focused on the key factors affecting the tensile strength of cold recycled asphalt mixture with cement and emulsified asphalt. The specific surface areas and strength of RAP were analyzed. The interaction between the emulsified asphalt and cement was observed. Comprehensive laboratory testing was conducted to evaluate the influences of RAP, emulsified asphalt, and cement on the tensile strength of cold recycled asphalt mixture. It is found that although RAP is used as aggregates, its inner structure and strength are much different from real aggregates. The strength of RAP has decisive effect on the strength of cold recycled asphalt mixture. New aggregates and fine gradation design can help improve the bonding between RAP and binder. For emulsified asphalt, slow setting of asphalt can give sufficient time for cement to hydrate which is helpful for strength formation in the cold recycled asphalt mixture. The high viscosity of asphalt can improve the early strength of cold recycled asphalt mixture that is important for traffic opening in the field. Cement is an efficient additive to improve the strength of cold recycled asphalt mixtures by promoting demulsification of emulsified asphalt and producing cement hydrates. However, the cement content is limited by RAP.

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“…Yang et al studied the effects of RAP materials on the performances of cement stabilized recycled mixture, and indicated that optimal aggregates gradation should be designed before the determination of optimal contents of emulsified asphalt binder and cement [28]. So, in this study, the vibration compaction method was applied to determine the aggregate gradation as 65% RAP materials, 13% new aggregates (0–3 mm), 20% new aggregates (10–20 mm), and 2% mineral powders.…”

Section: Materials and Experimentsmentioning

confidence: 99%

Composition Design and Performance Evaluation of Emulsified Asphalt Cold Recycled Mixtures

Huang

et al. 2019

Materials

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Based on an analysis of the cold regeneration mechanism of emulsified asphalt, the emulsified asphalt binders and cement were applied to prepare the cold recycled mixtures, and the main technical performances of the designed mixtures were evaluated, including high-temperature stability, water stability, and fatigue characteristics. A high content of 65% recycled asphalt pavement (RAP) material was used with some new aggregates and mineral powders, and the optimal emulsified asphalt binder and cement dosages were determined as 2.9% and 1.5% respectively. The technical performance test results show that: (1) The well-designed emulsified asphalt cold recycled mixtures have good high-temperature stability and water stability, and can meet the requirements of the road base layer and the lower layer. (2) When the stress level is lower, the fatigue performance of mixtures with lower emulsified asphalt binder dosage and lower cement content is better, but when the stress level is higher, the high dosage of emulsified asphalt binder is more favorable, while the cement content has little effect on the fatigue property. (3) The emulsified asphalt cold recycled mixtures have relatively poor fatigue resistance, and their fatigue life is significantly lower than that of the hot mixed asphalt mixtures.

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The theoretical analysis of the RAP aged asphalt influence on the performance of asphalt emulsion cold recycled mixes

Cited by 43 publications

References 19 publications

A laboratory and filed evaluation of Cold Recycled Mixture for base layer entirely made with Reclaimed Asphalt Pavement

A laboratory and filed evaluation of Cold Recycled Mixture for base layer entirely made with Reclaimed Asphalt Pavement

Strength Mechanism and Influence Factors for Cold Recycled Asphalt Mixture

Composition Design and Performance Evaluation of Emulsified Asphalt Cold Recycled Mixtures

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