The characteristics of hot mixed asphalt modified by nanosilica

Hasaninia, Moein; Haddadi, Farshad

doi:10.1080/10916466.2016.1258412

Cited by 42 publications

(21 citation statements)

References 4 publications

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“…It can be concluded from both DSR and BBR tests that RA2 causes a reduction in the viscous behavior of the binder. (7) It is necessary to differentiate between rejuvenators that reduce the longevity of the binder and those that increase it. To achieve this, a quantitative description of durability is needed.…”

Section: Resultsmentioning

confidence: 99%

“…Aging of the asphalt binder is among most critical parameters that make recycled asphalt mixtures different from new material. When pavement ages, the asphalt binder becomes hard, brittle, and prone to cracking [5][6][7]. The reason for this phenomenon is that lighter components of the asphalt or maltenes are partially lost due to evaporation and oxidation.…”

Section: Introductionmentioning

confidence: 99%

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Aging of Rejuvenated Asphalt Binders

Mohammadafzali¹,

Ali²,

Musselman³

et al. 2017

Advances in Materials Science and Engineering

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An important concern that limits the RAP content in asphalt mixtures is the fact that the aged binder that is present in the RAP can cause premature cracking. Rejuvenators are frequently added to high RAP mixtures to enhance the properties of the binder. There is no existing method to predict the longevity of a rejuvenated asphalt. This study investigated the aging of rejuvenated binders and compared their durability with that of virgin asphalt. Various samples with different types and proportions of RAP, virgin binder, and rejuvenator were aged by RTFO and three cycles of PAV. DSR and BBR tests were conducted to examine the high-temperature and low-temperature rheological properties of binders. Results indicated that the type and dosage of the rejuvenator have a great influence on the aging rate and durability of the binder. Some rejuvenators make the binder age slower, while others accelerate aging. These observations confirm the importance of evaluating the long-term aging of recycled binders. For this purpose, critical PAV time was proposed as a measure of binder’s longevity.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Aging of Rejuvenated Asphalt Binders

Mohammadafzali¹,

Ali²,

Musselman³

et al. 2017

Advances in Materials Science and Engineering

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“…[6], the application of nanomaterials as asphalt modifiers is growing rapidly in popularity due to its unique characteristics that significantly improve the performance of asphalt binder. It has been shown in several studies that the addition of nano-silica in asphalt mixtures improve the oxidative aging property, increases resistance to the rutting effect, improves the rheological properties of asphalt mixture and decreases the interaction between asphalt molecules [7][8][9][10]. In addition, Ref.…”

Section: Introductionmentioning

confidence: 99%

Life Cycle Assessment for the Production Phase of Nano-Silica-Modified Asphalt Mixtures

2019

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To combat the rutting effect and other distresses in asphalt concrete pavement, certain modifiers and additives have been developed to modify the asphalt mixture to improve its performance. Although few additives exist, nanomaterials have recently attracted significant attention from the pavement industry. Several experimental studies have shown that the use of nanomaterials to modify asphalt binder results in an improved oxidative aging property, increased resistance to the rutting effect, and improves the rheological properties of the asphalt mixture. However, despite the numerous benefits of using nanomaterials in asphalt binders and materials, there are various uncertainties regarding the environmental impacts of nano-modified asphalt mixtures (NMAM). Therefore, this study assessed a Nano-Silica-Modified Asphalt Mixtures in terms of materials production emissions through the Life Cycle Assessment methodology (LCA), and the results were compared to a conventional asphalt mixture to understand the impact contribution of nano-silica in asphalt mixtures. To be able to compare the relative significance of each impact category, the normalized score for each impact category was calculated using the impact scores and the normalization factors. The results showed that NMAM had a global warming potential of 7.44563 × 103 kg CO2-Eq per functional unit (FU) compared to 7.41900 × 103 kg CO2-Eq per functional unit of the conventional asphalt mixture. The application of LCA to NMAM has the potential to guide decision-makers on the selection of pavement modification additives to realize the benefits of using nanomaterials in pavements while avoiding potential environmental risks.

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“…Further details and discussions about engineering performance of NC-modified mixture are presented in another article by the same authors [19].…”

Section: Four-point Beam Fatigue Testmentioning

confidence: 99%

Studying Engineering Characteristics of Asphalt Binder and Mixture Modified by Nanosilica and Estimating Their Correlations

Hasaninia

Haddadi

2018

Advances in Materials Science and Engineering

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e objective of this research was to investigate rutting and fatigue distresses in asphalt containing 2, 4, 6, and 8 percent of nanosilica (NC) and to find out the correlation between engineering properties of the modified binder and mixture asphalt. In order to study the effect of NC on the rutting and fatigue properties of modified binders, the multiple stress creep recovery (MSCR) and linear amplitude sweep (LAS) tests were carried out. e Marshall stability, dynamic creep, and four-point bending beam fatigue tests were used to evaluate performance characteristics of the mixtures. e binder and mixture tests all indicated an improvement of fatigue and rutting resistance using NC as a modifier. Furthermore, some statistical correlations between engineering properties were developed successfully.

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The characteristics of hot mixed asphalt modified by nanosilica

Cited by 42 publications

References 4 publications

Aging of Rejuvenated Asphalt Binders

Aging of Rejuvenated Asphalt Binders

Life Cycle Assessment for the Production Phase of Nano-Silica-Modified Asphalt Mixtures

Studying Engineering Characteristics of Asphalt Binder and Mixture Modified by Nanosilica and Estimating Their Correlations

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