Effects of WMA additives and hydrated lime on high-stress and high-temperature performance of Elvaloy®- and PPA-modified asphalt binder

The purpose of this study aims at investigating the impact of multi-walled carbon nanotubes (MWCNT’s) on the properties of low viscosity grade asphalt binder. Asphalt binder with viscosity grade-10 is selected as the control binder and later it is modified with different percentages of MWCNT’s (0.5–2.5%). Penetration, softening point, ductility and rotational viscosity test were employed for evaluating the effect of MWCNT’s on basic physical properties of modified asphalt binder. Dynamic Shear Rheometer (DSR) is used for evaluating the rheological properties of the base and modified bitumen, for both aged and unaged bitumen. Based on the conventional and basic rheological tests, it was seen that the addition of MWCNT’s improved the high-temperature performance of modified bitumen. Multiple Stress Creep and Recovery (MSCR) test results revealed that the addition of MWCNT’s improved the creep and recovery of modified binders for both stress intensities (0.1 kPa and 3.2 kPa) which confirms that the modified binder is more rut resistant. Moreover, it was observed that there was a significant improvement in the aging resistance of the asphalt binder due to addition of MWCNTs. However low temperature performance of MWCNTs was not encouraging. Also, MWCNTs addition to asphalt binder was found to be stable under high-temperature storage condition. Overall, there is a significant amount of improvement using MWCNTs in the base asphalt binder.

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Effect of recycled asphalt binder on high and intermediate temperature performance of polymer modified asphalt binder

International Journal of Pavement Research and Technology ◽

10.1007/s42947-019-0059-3 ◽

2019 ◽

Vol 12 (5) ◽

pp. 486-496 ◽

Cited By ~ 3

Author(s):

Dharamveer Singh ◽

Shashibhushan Girimath ◽

Prabin Kumar Ashish

Keyword(s):

Asphalt Binder ◽

Intermediate Temperature ◽

Recycled Asphalt ◽

Modified Asphalt ◽

Temperature Performance ◽

Modified Asphalt Binder ◽

Polymer Modified Asphalt

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Application of biochar from crop straw in asphalt modification

PLoS ONE ◽

10.1371/journal.pone.0247390 ◽

2021 ◽

Vol 16 (2) ◽

pp. e0247390

Author(s):

Xinli Gan ◽

Wenli Zhang

Keyword(s):

Electron Microscopy ◽

Particle Size ◽

High Temperature ◽

High Speed ◽

Asphalt Binder ◽

Crop Straw ◽

Modified Asphalt ◽

Temperature Performance ◽

Asphalt Modification ◽

Scanning Electron

The objective of this study is to verify the feasibility of using biochar made from crop straw as a bitumen additive to improve some properties of bitumen. The differences between crop straw biochar prepared in a laboratory and commercial charcoal were investigated through scanning electron microscopy and laser particle size analyses. Furthermore, biochar-modified asphalt was prepared using the high-speed shear method, and the penetration, softening point, ductility at 15°C, and apparent viscosity of the asphalt binder with 6% biochar were measured at 120, 135, 150, 160, and 175°C. It was found that both the crop straw biochar and the commercial charcoal consist mainly of C, O, Si, and K, but the C content of crop straw biochar is slightly higher than that of commercial charcoal. The particle size of biochar is smaller than that of commercial charcoal, while the specific surface area is larger. It was determined that the addition of crop straw biochar significantly improved the high-temperature performance of asphalt, and that biochar and commercial charcoal have a similar influence on the high temperature performance of asphalt.

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Effect of Recycled Shell Waste as a Modifier on the High- and Low-Temperature Rheological Properties of Asphalt

Sustainability ◽

10.3390/su131810271 ◽

2021 ◽

Vol 13 (18) ◽

pp. 10271

Author(s):

Yuchen Guo ◽

Xuancang Wang ◽

Guanyu Ji ◽

Yi Zhang ◽

Hao Su ◽

...

Keyword(s):

High Temperature ◽

Low Temperature ◽

Rheological Properties ◽

Low Temperatures ◽

High Speed ◽

Permanent Deformation ◽

Asphalt Binder ◽

Asphalt Binders ◽

Modified Asphalt ◽

Temperature Performance

The deteriorating ecological environment and the concept of sustainable development have highlighted the importance of waste reuse. This article investigates the performance changes resulting from the incorporation of shellac into asphalt binders. Seashell powder-modified asphalt was prepared with 5%, 10%, and 15% admixture using the high-speed shear method. The microstructure of the seashell powder was observed by scanning electron microscope test (SEM); the physical-phase analysis of the seashell powder was carried out using an X-ray diffraction (XRD) test; the surface characteristics and pore structure of shellac were analyzed by the specific surface area Brunauer-Emmett-Teller (BET) test; and Fourier infrared spectroscopy (FTIR) qualitatively analyzed the composition and changes of functional groups of seashell powder-modified asphalt. The conventional performance index of seashell powder asphalt was analyzed by penetration, softening point, and ductility (5 °C) tests; the effect of seashell powder on asphalt binder was studied using a dynamic shear rheometer (DSR) and bending beam rheometer (BBR) at high and low temperatures, respectively. The results indicate the following: seashell powder is a coarse, porous, and angular CaCO3 bio-material; seashell powder and the asphalt binder represent a stable physical mixture of modified properties; seashell powder improves the consistency, hardness, and high-temperature performance of the asphalt binder but weakens the low-temperature performance of it; seashell powder enhances the elasticity, recovery performance, and permanent deformation resistance of asphalt binders and improves high-temperature rheological properties; finally, seashell powder has a minimal effect on the crack resistance of asphalt binders at very low temperatures. In summary, the use of waste seashells for recycling as bio-modifiers for asphalt binders is a practical approach.

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Low-Temperature Performance of Toner-Modified Asphalt Binder

Journal of Transportation Engineering Part B Pavements ◽

10.1061/jpeodx.0000123 ◽

2019 ◽

Vol 145 (3) ◽

pp. 04019022 ◽

Cited By ~ 6

Author(s):

Mohammad Ali Notani ◽

Fereidoon Moghadas Nejad ◽

Ellie H. Fini ◽

Pouria Hajikarimi

Keyword(s):

Low Temperature ◽

Asphalt Binder ◽

Modified Asphalt ◽

Temperature Performance ◽

Modified Asphalt Binder ◽

Low Temperature Performance

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Laboratory Investigation of the High Temperature Rheological Property of Activated Coal Gangue Modified Asphalt Binder

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.744-746.1261 ◽

2015 ◽

Vol 744-746 ◽

pp. 1261-1265 ◽

Cited By ~ 1

Author(s):

Xiao Kai Yang ◽

Rui Xiong ◽

Fa Yang ◽

Hui Qing Yin ◽

Tao Yang

Keyword(s):

High Temperature ◽

Asphalt Binder ◽

Coal Gangue ◽

Gangue Mineral ◽

Modified Asphalt ◽

Industrial Solid Waste ◽

Activated Coal ◽

Modified Asphalt Binder ◽

Mineral Powder ◽

Activated Coal Gangue

The coal gangue is one of the largest industrial solid waste emissions in our country at present, the research about making coal gangue as the filler to modify the properties of asphalt is still blank both at home and abroad. Using rotational viscosity test and dynamic shear rheological test (DSR) to study the high temperature rheological properties of the activated coal gangue modified asphalt binder when under the condition of different filler-bitumen ratio, and compared with mineral powder modified asphalt binder; Based on this, explores the mechanism of coal gangue modified asphalt binder. The results show that the activated coal gangue instead of mineral powder can make the high temperature performance of asphalt binder increases sharply. Research results provide feasible basis of activated coal gangue mineral powder can instead of mineral powder improving the high temperature rheological performance of asphalt binder.

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