Apparent Molecular Weight Distributions for Investigating Aging in Polymer-Modified Bitumen
The oxidative aging of bituminous binders affects the performance and durability of pavements. In the case of polymer-modified binders, aging involves both bitumen and polymers and has a strong impact on the whole architecture of the material. Rheology may help in understanding these structural chan...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | Advances in Polymer Technology |
| Online Access: | http://dx.doi.org/10.1155/2021/3660646 |
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| author | Miriam Cappello Sara Filippi Yvong Hung Massimo Losa Giovanni Polacco |
| author_facet | Miriam Cappello Sara Filippi Yvong Hung Massimo Losa Giovanni Polacco |
| author_sort | Miriam Cappello |
| collection | DOAJ |
| description | The oxidative aging of bituminous binders affects the performance and durability of pavements. In the case of polymer-modified binders, aging involves both bitumen and polymers and has a strong impact on the whole architecture of the material. Rheology may help in understanding these structural changes, and interesting information may be obtained by analysing the evolution of apparent molecular weight distributions. This was demonstrated with a bituminous binder modified with a poly(styrene-butadiene) block copolymer and subjected to prolonged artificial aging. Isothermal frequency sweep tests were used to construct master curves of the phase angle and magnitude of the complex modulus. The master curves were then used to calculate relaxation spectra and apparent molecular weight distributions of the binders, as well as simulated temperature sweep tests. A comparison of the behaviour of the base and modified bitumen highlighted the role of the polymer in aging. Polymer degradation significantly damages the elastomeric network, yet the residual polymer chains still interact with the bitumen molecules and reduce their oxidative aging. The apparent molecular weight distributions were deconvoluted to create an aging index specifically developed for polymer-modified bitumen. |
| format | Article |
| id | doaj-art-7ae4da01c8784be8a9ec4670b3a337e7 |
| institution | Kabale University |
| issn | 1098-2329 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Polymer Technology |
| spelling | doaj-art-7ae4da01c8784be8a9ec4670b3a337e72025-02-03T05:53:26ZengWileyAdvances in Polymer Technology1098-23292021-01-01202110.1155/2021/3660646Apparent Molecular Weight Distributions for Investigating Aging in Polymer-Modified BitumenMiriam Cappello0Sara Filippi1Yvong Hung2Massimo Losa3Giovanni Polacco4Department of Civil and Industrial EngineeringDepartment of Civil and Industrial EngineeringBitumen ActivitiesDepartment of Civil and Industrial EngineeringDepartment of Civil and Industrial EngineeringThe oxidative aging of bituminous binders affects the performance and durability of pavements. In the case of polymer-modified binders, aging involves both bitumen and polymers and has a strong impact on the whole architecture of the material. Rheology may help in understanding these structural changes, and interesting information may be obtained by analysing the evolution of apparent molecular weight distributions. This was demonstrated with a bituminous binder modified with a poly(styrene-butadiene) block copolymer and subjected to prolonged artificial aging. Isothermal frequency sweep tests were used to construct master curves of the phase angle and magnitude of the complex modulus. The master curves were then used to calculate relaxation spectra and apparent molecular weight distributions of the binders, as well as simulated temperature sweep tests. A comparison of the behaviour of the base and modified bitumen highlighted the role of the polymer in aging. Polymer degradation significantly damages the elastomeric network, yet the residual polymer chains still interact with the bitumen molecules and reduce their oxidative aging. The apparent molecular weight distributions were deconvoluted to create an aging index specifically developed for polymer-modified bitumen.http://dx.doi.org/10.1155/2021/3660646 |
| spellingShingle | Miriam Cappello Sara Filippi Yvong Hung Massimo Losa Giovanni Polacco Apparent Molecular Weight Distributions for Investigating Aging in Polymer-Modified Bitumen Advances in Polymer Technology |
| title | Apparent Molecular Weight Distributions for Investigating Aging in Polymer-Modified Bitumen |
| title_full | Apparent Molecular Weight Distributions for Investigating Aging in Polymer-Modified Bitumen |
| title_fullStr | Apparent Molecular Weight Distributions for Investigating Aging in Polymer-Modified Bitumen |
| title_full_unstemmed | Apparent Molecular Weight Distributions for Investigating Aging in Polymer-Modified Bitumen |
| title_short | Apparent Molecular Weight Distributions for Investigating Aging in Polymer-Modified Bitumen |
| title_sort | apparent molecular weight distributions for investigating aging in polymer modified bitumen |
| url | http://dx.doi.org/10.1155/2021/3660646 |
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