AFM-Based Approach to Study Blending between RAP and Virgin Asphalt Binders

Abu-Qtaish, Lana; Nazzal, Munir D.; Kaya, Savaş; Kim, Sang Soo; Abbas, Ala; Hassan, Y.

doi:10.1061/(asce)mt.1943-5533.0002182

Cited by 24 publications

(12 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, provincial transportation agencies are often unwilling to adopt higher RAP levels, typically larger than 20 wt.% by weight of total mixture. Incorporating substantial amounts of RAP into new paving mixtures constitutes a critical concern, because the resultant blends may be vulnerable to adhesion and cohesion distress as well as cracking failures during the service life of the road pavement [1]. This is due primarily to the oxidative aging of the asphalt binder coating the aggregates enclosed in the RAP material.…”

Section: Introductionmentioning

confidence: 99%

Towards the Use of Waste Pig Fat as a Novel Potential Bio-Based Rejuvenator for Recycled Asphalt Pavement

et al. 2020

View full text Add to dashboard Cite

This article presents a novel potential bio-based rejuvenator derived from waste pig fat (WPF) for use in recycled asphalt applications. To achieve this purpose, the impact of different doses waste pig fat (e.g., 0, 3, 6, and 9 wt.% WPF) on the reclaimed asphalt pavement binder (RAP-B) performance is investigated. The unmodified and WPF-modified asphalts are characterized by means of Fourier-transform infrared spectroscopy (FT-IR), thin-layer chromatography–flame ionization detection (TLC-FID), scanning electron microscopy (SEM), atomic force microscopy (AFM), thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC). Physico-rheological properties of asphalt blends are assessed through Brookfield viscometer, softening point, penetration, and dynamic shear rheometer (DSR) tests. TLC-FID data highlighted that incremental WPF addition into RAP-B restored its original balance maltenes-to-asphaltenes ratio; finding which was supported by FT-IR analysis. SEM disclosed that WPF has a great compatibility with the aged asphalt. AFM observations showed that grease treatment induced a decline in surface roughness (i.e., bee structures) and a rise in friction force (i.e., para-phase dimension) of RAP binder. TGA/DSC studies revealed that the bio-modifier not only possesses an excellent thermal stability but also can substantially enhance the binder low-temperature performance. Empirical and DSR tests demonstrated that WPF improved the low-temperature performance grade of RAP-B, reduced its mixing and compaction temperatures, and noticeably boosted its fatigue cracking resistance. The rejuvenation of aged asphalt employing WPF is feasible and can be an ideal approach to recycle both of RAP and waste pig fats.

show abstract

Section: Introductionmentioning

confidence: 99%

Towards the Use of Waste Pig Fat as a Novel Potential Bio-Based Rejuvenator for Recycled Asphalt Pavement

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Instead of giving height information, however, it maps DMT modulus. Large errors reported in the past (15,17) and observed from binder results imply that average modulus is associated with high error because of surface oscillation. For this reason, the histogram of DMT modulus (Figure 2) on the scan area of each binder, which demonstrates frequency distribution of DMT modulus, was used for evaluation.…”

Section: Surface Morphology and Mechanical Properties Of Asphalt Bindersmentioning

confidence: 96%

“…This substrate was then heated at 150°C and went through visual check every 15 s. As soon as the two binder drops melted, spread, and began contact with each other, the substrate was removed from the heat and left to cool at room temperature. This preparation procedure was similar to those applied elsewhere (12,15,17), the only difference being the heating temperature and duration, because of difference in binder stiffness.…”

Section: Binder Sample Preparationmentioning

confidence: 99%

“…A fit of the unloading portion of the cycle using the Derjaguine-Mu¨llere-Toporov (DMT) model is utilized to calculate the DMT modulus. More information on parameter calculation can be found elsewhere (15,19).…”

Section: Peak Force Quantitative Nanomechanical Mapping and Test Parametersmentioning

confidence: 99%

“…Moreover, the authors estimated that 85% of RAP binder was effective in the composite binder. AbuQtaish et al (15) reported reduced modulus and bonding energy when virgin binder with lower stiffness was used, indicating a softening effect of the softer virgin binder. The authors concluded that virgin binder and RAP binder do blend; bonding properties of the blending zone were determined by the virgin binder; the stiffness properties of the blended binder, on the other hand, was primarily attributed to RAP binder stiffness.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Investigating Degree of Blending Between Reclaimed Asphalt Pavement and Virgin Binder Using Atomic Force Microscopy and Focused Ion Beam

Solaimanian

Chen

2021

Transportation Research Record

View full text Add to dashboard Cite

Adding reclaimed asphalt pavement (RAP) into asphalt mixes is a common practice and has many merits such as reducing costs and emissions. In recent decades, many state highway agencies have embarked on investigating asphalt mixes with high RAP content. As the RAP content increases, understanding how well the RAP binder blends with virgin binder becomes more crucial. Lack of knowledge on how much of the residual RAP binder actively blends with virgin binder during production is one of the reasons preventing full exploitation of RAP materials. Obviously, the amount of aged RAP binder blending into virgin binder affects the properties of asphalt mixes. A study was undertaken to investigate the degree of blending, that is, the amount of RAP binder blended with virgin binder, through atomic force microscopy (AFM) and focused ion beam (FIB). The AFM measurements were conducted on both binder samples and RAP aggregate samples; the former consisted of extracted and recovered RAP binder, virgin binder, and blended binder, while the latter covered blended RAP aggregate and virgin binder samples. AFM measurements on binders indicated that blended RAP and virgin binder, at the blending zone between RAP and virgin binder, has moduli between that of pure RAP binder and pure virgin binder. AFM was also explored to investigate the degree of blending using RAP aggregate and virgin binder, but preparation of acceptable samples for such work was not possible, in spite of extensive work in preparation of such samples through mechanical polishing and FIB.

show abstract

Characterization of agglomeration of reclaimed asphalt pavement for cold recycling

Zhu

Fang

2020

Construction and Building Materials

View full text Add to dashboard Cite

AFM-Based Approach to Study Blending between RAP and Virgin Asphalt Binders

Cited by 24 publications

References 11 publications

Towards the Use of Waste Pig Fat as a Novel Potential Bio-Based Rejuvenator for Recycled Asphalt Pavement

Towards the Use of Waste Pig Fat as a Novel Potential Bio-Based Rejuvenator for Recycled Asphalt Pavement

Investigating Degree of Blending Between Reclaimed Asphalt Pavement and Virgin Binder Using Atomic Force Microscopy and Focused Ion Beam

Characterization of agglomeration of reclaimed asphalt pavement for cold recycling

Contact Info

Product

Resources

About