Biochar for asphalt modification: A case of high-temperature properties improvement

Ma, Feng; Dai, Jiasheng; Fu, Zhen; Li, Chen; Wen, Yalu; Jia, Meng; Wang, Yujie; Shi, Ke

doi:10.1016/j.scitotenv.2021.150194

Cited by 29 publications

(20 citation statements)

References 53 publications

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“…In summary, a similar analysis of biochar and other biomass carbon material has been reported by other researchers in terms of the high- and low-temperature performance. Previous studies revealed that biochar with a porous fibrous structure can enhance the high-temperature performance of asphalt [ 24 , 25 ], which would slightly impair the low-temperature performance [ 15 ].…”

Section: Resultsmentioning

confidence: 99%

Study on Properties and Micro-Mechanism of RHB-SBS Composite-Modified Asphalt

Chen

Shi

et al. 2023

Polymers

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Rice husk biochar (RHB) is a renewable agricultural waste, and its fixation on pavements helps develop environmentally friendly, economical, and sustainable asphalt pavements. This paper used RHB to replace part of styrene-butadiene-styrene (SBS) for the composite modification study of matrix asphalt. The high- and low-temperature properties and microscopic mechanisms of the composite-modified asphalt were studied through a series of tests. The results showed that, compared with SBS-modified asphalt, the softening point, viscosity, complex shear modulus, stiffness modulus, and rutting factors of RHB-SBS composite-modified asphalt were improved. In contrast, the ductility and creep rate were slightly decreased, indicating an improvement in the high-temperature performance of composite-modified asphalt, but a slight decrease in its low-temperature performance. The process of RHB and SBS composite modification was mainly physical blending, with only a small number of chemical reactions, and no new functional groups were generated. The porous structure of RHB enables it to adhere better to the network crosslinked continuous phase system formed by SBS and matrix asphalt. This results in composite-modified asphalt with good high-temperature storage stability and rheological properties. Therefore, RHB-SBS composite-modified asphalt can be applied to high-temperature areas and rice-producing areas, and the optimal content of RHB is suggested to be 15%.

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Section: Resultsmentioning

confidence: 99%

Study on Properties and Micro-Mechanism of RHB-SBS Composite-Modified Asphalt

Chen

Shi

et al. 2023

Polymers

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“…The presence of heteroatoms such as N and S into the carbonaceous matrix can be attractive for different applications: as catalyst, as adsorbent, as material for the development of components for energy harvesting modules and as additive for the pavement industry [ 4 , 22 , 60 , 61 , 62 ]. Biochar has been tested by different authors as a possible carbon-based low-cost additive in asphalt preparation [ 63 , 64 ]. These studies highlighted that the chemicophysical and morphological characteristics of biochar play a relevant role, since they are proven to interact with the macromolecules of the bitumen.…”

Section: Resultsmentioning

confidence: 99%

Pyrolysis and Gasification of a Real Refuse-Derived Fuel (RDF): The Potential Use of the Products under a Circular Economy Vision

et al. 2022

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Refuse-Derived Fuels (RDFs) are segregated forms of wastes obtained by a combined mechanical–biological processing of municipal solid wastes (MSWs). The narrower characteristics, e.g., high calorific value (18–24 MJ/kg), low moisture content (3–6%) and high volatile (77–84%) and carbon (47–56%) contents, make RDFs more suitable than MSWs for thermochemical valorization purposes. As a matter of fact, EU regulations encourage the use of RDF as a source of energy in the frameworks of sustainability and the circular economy. Pyrolysis and gasification are promising thermochemical processes for RDF treatment, since, compared to incineration, they ensure an increase in energy recovery efficiency, a reduction of pollutant emissions and the production of value-added products as chemical platforms or fuels. Despite the growing interest towards RDFs as feedstock, the literature on the thermochemical treatment of RDFs under pyrolysis and gasification conditions still appears to be limited. In this work, results on pyrolysis and gasification tests on a real RDF are reported and coupled with a detailed characterization of the gaseous, condensable and solid products. Pyrolysis tests have been performed in a tubular reactor up to three different final temperatures (550, 650 and 750 °C) while an air gasification test at 850 °C has been performed in a fluidized bed reactor using sand as the bed material. The results of the two thermochemical processes are analyzed in terms of yield, characteristics and quality of the products to highlight how the two thermochemical conversion processes can be used to accomplish waste-to-materials and waste-to-energy targets. The RDF gasification process leads to the production of a syngas with a H2/CO ratio of 0.51 and a tar concentration of 3.15 g/m3.

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“…In recent years, modification of bitumen with different bio chars has been investigated [6][7][8][9][10]. It was determined that the biochar had better effects than commercial graphite on high temperature performance of bitumen [6].…”

Section: Introductionmentioning

confidence: 99%

“…It was determined that the biochar had better effects than commercial graphite on high temperature performance of bitumen [6]. By using pyrolysis chars as additives in bitumen not only can be enhanced the high temperature properties of flexible pavements but also can be disposed the wastes with a sustainable solution by this way [6,8,11,12]. The amount of wastes in the world is rising day by day with the increasing population growth.…”

Section: Introductionmentioning

confidence: 99%

“…And all of these pyrolysis products can be potentially used for different purposes in various areas [12,13,19]. Biochar which is the solid pyrolysis product of biomass is a carbon rich material and has large surface area with high porosity [8,10,16,20]. Therefore, biochar can form a stiff structure with bitumen and can enhance the physical properties and high temperature performance of the bitumen due to its high porosity and high absorption properties [8,10].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

High Temperature Rheological Properties and Storage Stability of Bitumen Modified with The Char Produced from Co-Pyrolysis of Different Wastes

Atasağun¹

2023

Preprint

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By enhancing the bitumen properties with the additives produced from wastes not only can be improved the performance of flexible pavements but also can be contributed to the environment. This research aims to produce a novel pyrolytic char from different wastes and to investigate the usability of this char as an additive in bitumen. In this study, firstly, the pyrolytic char was produced from co-pyrolysis of three different wastes including waste paper cups, polypropylene (PP) and polyethylene terephthalate (PET) wastes. Properties of the char were determined by using CHN (carbon, hydrogen, nitrogen) and Fourier transform infrared spectroscopy (FTIR) analyses. The high temperature rheological properties of binders were evaluated by using DSR (dynamic shear rheometer), RV (rotational viscometer), softening point and penetration tests. Additionally, specific gravity, storage stability, high temperature performance grades (PG) and temperature susceptibilities of binders were determined. Test results showed that this pyrolytic char enhanced the high temperature properties of neat bitumen by increasing softening point, viscosity, rutting resistance and high temperature PG. And, it can be said that the bituminous binder modified with this pyrolytic char had a good storage stability when it was used at 8% ratio in neat bitumen.

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Biochar for asphalt modification: A case of high-temperature properties improvement

Cited by 29 publications

References 53 publications

Study on Properties and Micro-Mechanism of RHB-SBS Composite-Modified Asphalt

Study on Properties and Micro-Mechanism of RHB-SBS Composite-Modified Asphalt

Pyrolysis and Gasification of a Real Refuse-Derived Fuel (RDF): The Potential Use of the Products under a Circular Economy Vision

High Temperature Rheological Properties and Storage Stability of Bitumen Modified with The Char Produced from Co-Pyrolysis of Different Wastes

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