Mechanisms for chemical reactivity of two kinds of polymer modified asphalts during thermal degradation

Suzuki, Motoyuki; Kajita, Junichiro; Ochiai, Mitsue; Takagi, Noriyuki; Iwai, Shigeo; Hirano, Koji

doi:10.1016/j.cej.2011.08.080

Cited by 33 publications

(14 citation statements)

References 12 publications

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“…Asphalt modification by polymers improves its mechanical properties, and therefore the properties of road pavements, such as resistance to permanent deformation, low temperature cracking, and load‐associated fatigue, wear, and stripping, are improved . However, the enhanced properties of this modified asphalt can evolve because of aging during mixing, storage, and application in service . Aging is already a very complex process in conventional asphalt, and the complexity increases when a polymer‐modified asphalt is involved …”

Section: Introductionmentioning

confidence: 99%

Aging properties and mechanism of the modified asphalt by packaging waste polyethylene and waste rubber powder

Fang

et al. 2012

Polymers for Advanced Techs

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For the consideration of the environmental and economic issues, retrieved packaging waste polyethylene and waste rubber powder were selected as modifiers to modify the ordinary oil asphalt, and the rotating film oven test was adopted to study the aging process of the modified asphalt. The results showed that the performance of the modified asphalt deteriorated, as indicated by the increase in the softening point and the reduced ductility and penetration. However, compared with nonmodified asphalt, the rangeability of the performance indicators of the modified asphalt before and after aging became narrow, indicating that the aging properties of the modified asphalt were improved. In the modified asphalt system, the swelling of the polymer modifiers was caused by the absorption of the light components of the asphalt, thereby reducing the formation of asphaltenes in the aging process. The polymer modifiers absorb the light oil of the asphalt, which can reduce the content of free radicals and improve the aging properties of the asphalt. In addition, the waste rubber power containing antioxidants and anti‐ozone agents effectively improves the antiaging properties of the asphalt. Copyright © 2012 John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 99%

Aging properties and mechanism of the modified asphalt by packaging waste polyethylene and waste rubber powder

Fang

et al. 2012

Polymers for Advanced Techs

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“…However, separation will occur easily due to the density difference between SBS and bitumen in the transportation or the storage [11]. In addition, the SBS modifier has thermal decomposition problem in bitumen; that is, molecule breakage and degradation would occur under a long-term high-temperature condition, resulting in the continuous decline of softening point and ductility as well as the declining of the performances of SBS modified bitumen after it is produced [12,13,14]. Segregation and thermal decomposition seriously reduce the performance of SBS-modified bitumen.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Direct-to-Plant Styrene-Butadiene-Styrene Block Copolymer Components on Bitumen Modification

et al. 2019

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Five types of material, styrene-butadiene-styrene block copolymer (SBS), ethyl-vinyl-acetate (EVA), naphthenic oil, maleic anhydride grafted ethylene-vinyl acetate copolymer (EVA-g-MAH) and butylated hydroxytoluene (BHT) were used as the raw ingredients for manufacturing direct-to-plant SBS in this paper. Thirteen kinds of direct-to-plant SBS with different EVA/SBS and naphthenic oil/SBS were prepared as well as the processes diagrammatic sketch of dispersion and swelling of direct-to-plant SBS modifier in bitumen were discussed. Microscopic images of direct-to-plant SBS modified bitumen with different components were obtained using fluorescence microscopy. The micro-images were analysed and quantified with MATLAB software. The influence of key components on the micro-morphology of direct-to-plant SBS-modified bitumen is discussed, followed with the tests on melting points and the melting indexes of direct-to-plant SBS with different EVA/SBS and naphthenic oil/SBS. The performances test of bitumen and bituminous mixture modified by these direct-to-plant SBS were also conducted. Results show that, with the ratio improvement of EVA/SBS or naphthenic oil/SBS, the number of the pixel dot number of area (SBS) in microscopic images increased. Enlargement of the pixel dot number of centre line elongate and the structure fineness was observed, indicating that the dispersion and swelling effect of the SBS modifier in bitumen had been improved. Meanwhile, the macro index, such as the melting point and melting index of direct-to-plant SBS, was also improved corresponding to the increase of EVA/SBS ratio or naphthenic oil/SBS ratio. With the addition of EVA or naphthene oil content, penetration and ductility of direct-to-plant SBS modified bitumen received gradual enhancement, but the softening point and viscosity were found out to be decreased. The high-temperature and low-temperature performances of direct-to-plant SBS modified bituminous mixture can be effectively improved by adding EVA or naphthenic oil. By meeting the required performances of direct-to-plant SBS, modified bitumen and bituminous mixture, the component of direct-to-plant SBS is recommended as, SBS:EVA:naphthenic oil:EVA-g-MAH:BHT is 1:0.1–0.5:0.05–0.2:0.03:0.05. For the compatibleness of SBS with different bitumen are different, necessary tests verification is recommended to be carried out prior to usage.

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“…On the other hand, understanding oxidation chemistry and kinetics is complicated by the fact that the asphalt oxidative aging procedure is complex because of the diversity of molecular types and the variation of oxidation rate affected by temperature, pressure, chemical composition (specific binder), and oxygen diffusivity [16][17][18][19]. Because of its importance to pavement durability and complexity, the goal of understanding asphalt oxidation fundamentals has attracted significant work from researchers over several decades when many studies have been conducted to explore, describe and predict asphalt physicochemical properties and chemical reaction mechanisms [20][21][22][23][24][25]. One significant discovery is that the carbonyl area (CA), measured in the infrared spectrum as the absorbance peak area above the 1820 cm À1 baseline and from 1820 to 1650 cm À1 , has been reported to relate linearly to the amount of oxygen reacted with asphalt [26].…”

Section: Introductionmentioning

confidence: 99%

A study on the oxidation kinetics of warm mix asphalt

Liu

Glover

2015

Chemical Engineering Journal

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Mechanisms for chemical reactivity of two kinds of polymer modified asphalts during thermal degradation

Cited by 33 publications

References 12 publications

Aging properties and mechanism of the modified asphalt by packaging waste polyethylene and waste rubber powder

Aging properties and mechanism of the modified asphalt by packaging waste polyethylene and waste rubber powder

The Effect of Direct-to-Plant Styrene-Butadiene-Styrene Block Copolymer Components on Bitumen Modification

A study on the oxidation kinetics of warm mix asphalt

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