A study to compare virgin and target asphalt binder obtained from various RAP blending charts

Singh, Dharamveer; Showkat, Burhan; Sawant, Dheeraj

doi:10.1016/j.conbuildmat.2019.07.038

Cited by 15 publications

(3 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the incorporation of RAP (reclaimed asphalt pavement) materials signifies a high-quality production of asphalt mixtures as the complicated compositions and status of RAP materials [1]. Particularly, owing to the presence of clusters caused by insufficient milling and crushing, the blending efficiency between newly added materials and RAP materials plays a critical role in high-quality recycled pavement construction [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Identifying the mixing-induced homogeneity characteristics of asphalt mixtures containing reclaimed asphalt pavement (RAP) materials

Qiu

Yan

et al. 2023

Preprint

View full text Add to dashboard Cite

The homogeneity of asphalt mixtures accounts for the pavement long-term durability, particularly for the recycled asphalt mixtures that includes reclaimed asphalt pavement (RAP) materials. Therefore, this study examined the mixing-induced homogeneity characteristics of recycled asphalt mixtures containing 40% RAP dosages. In specific, five mixing times and two ageing degrees of RAP binder were considered. The titanium dioxide powder was incorporated into RAP binders as an identification tracer. After the specimen preparation, the Computed Tomography (CT) technology was implemented to obtain the digital images of the specimen. In what follows, components of asphalt mixtures were separately identified. Accordingly, two homogeneity indexes were proposed to estimate the homogeneity of recycled asphalt mixtures. The results indicated that the distribution of the coarse aggregate contributed most to the specimen homogeneity, followed by the bitumen mastics and the air void. The extension of mixing time, to some extent, benefited the homogeneity degree of recycled asphalt mixtures. However, the newly formed clusters that occurred in the mixing process should be concerned and eliminated. For a cylinder specimen, the middle part of the specimen was more homogeneous than marginal positions.

show abstract

Section: Introductionmentioning

confidence: 99%

Identifying the mixing-induced homogeneity characteristics of asphalt mixtures containing reclaimed asphalt pavement (RAP) materials

Qiu

Yan

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Currently, the absolute viscosity and PG methods are used to estimate the proportion of RAP [ 41 ]. Superpave’s standard mix design method (which is specified in the standard AASHTO M323 [ 42 ]) for more than 25% RAP content based on the NCHRP 9-12 project suggests the use of a mixing chart to determine the proportion of RAP that can be added using the given binder or the grade of binder to use for the desired RAP content [ 6 ], assuming a homogeneous mix between AC-RAP and virgin asphalt, with 100% effectiveness.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the AASHTO M323 [ 42 ] standard also specifies the calculation of low, intermediate, and high temperatures for selection. However, according to Singh, Showkat and Sawant [ 41 ], Superpave’s rutting parameter, G*/sinδ, which evaluates the high-temperature PG of a binder and aids in the construction of the high-temperature PG mixing chart, is considered inadequate to properly evaluate the performance of modified binders. The blending charts are based on the critical temperature of the asphalt binder, a questionable parameter regarding the performance of the mixture if the binder used contains adhesion-promoting polymers [ 43 ].…”

Section: Introductionmentioning

confidence: 99%

Rheological Evaluation of Softened Binders Blended with Aged Asphalt Selected with a High-Temperature Mixing Chart

et al. 2022

View full text Add to dashboard Cite

Reclaimed asphalt pavements (RAP) provide economic and environmental benefits. In recent decades, their use has increased, but rheological properties are affected by RAP aging, increasing stiffness, cracking, and susceptibility to water. To counteract these effects, rejuvenating agents are used, but they must be properly dosed to design quality mixtures. Therefore, different binders were analyzed, including virgin binder (VBB), binder modified by SBS polymer (MB), AC-RAP, binder softened using a rejuvenating agent, and binders softened with doses (15%, 30%, and 45%) of AC-RAP. The rheological properties were evaluated by dynamic shear rheometry (DSR) and beam-bending rheometry (BBR) tests, while the linear amplitude sweep (LAS) test was used to measure fatigue cracking and the multiple stress creep recovery (MSCR) test was used to measure rutting. A mixing chart was constructed based on a high temperature AC-RAP to satisfy the performance grade (PG 76-22). The results showed that softened binders become flexible, but when AC-RAP is added, they turn stiff and behave better than MB. Moreover, combining a rejuvenating agent and AC-RAP reduces the aging stiffness of RAP, improving its rheological properties without compromising the rutting or cracking resistance.

show abstract

Comparison of Different Long-Term Aging Methods for Polymer-Modified Bitumen Using Advanced Rheological Tests

Suchismita

Singh

2023

Int. J. Pavement Res. Technol.

View full text Add to dashboard Cite

A study to compare virgin and target asphalt binder obtained from various RAP blending charts

Cited by 15 publications

References 13 publications

Identifying the mixing-induced homogeneity characteristics of asphalt mixtures containing reclaimed asphalt pavement (RAP) materials

Identifying the mixing-induced homogeneity characteristics of asphalt mixtures containing reclaimed asphalt pavement (RAP) materials

Rheological Evaluation of Softened Binders Blended with Aged Asphalt Selected with a High-Temperature Mixing Chart

Comparison of Different Long-Term Aging Methods for Polymer-Modified Bitumen Using Advanced Rheological Tests

Contact Info

Product

Resources

About