Effect of expanded vermiculite on microstructures and aging properties of styrene–butadiene–styrene copolymer modified bitumen

Taking advantage of crumb rubber from waste tires to modify bitumen is widely for the environmentally friendly and sustainable development of pavement. This study investigated the modification mechanism, rheological, and aging properties of styrene–butadiene–styrene (SBS)/desulfurized crumb rubber (DCR) composite modified bitumen (SBS/DCRMB). Morphological features and chemical characteristics were assessed by fluorescence intensity measurement and gel permeation chromatography (GPC), respectively, and results demonstrated that the DCR and SBS modifier in SBS/DCRMB had been vulcanized and formed a three-dimensional network structure. Moreover, a comparison of the GPC elution curve showed the residual bitumen hardly changed due to carbon black released from DCR of SBS/DCRMB during the aging process of SBS/DCRMB, and the polymer molecules condensed to larger units. However, the remaining bitumen in SBSMB had changed evidently and the polymer degraded to smaller molecules. Meanwhile the rheological testing results, including multiple stress creep recovery, linear amplitude sweep and bending beam rheometer, declared that the SBS/DCRMB is superior to SBSMB before and after aging.

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Experimental Study of Tensile Properties of Styrene–Butadiene–Styrene Modified Asphalt Binders

Materials ◽

10.3390/ma14071734 ◽

2021 ◽

Vol 14 (7) ◽

pp. 1734

Author(s):

Paweł Mieczkowski ◽

Bartosz Budziński ◽

Mieczysław Słowik ◽

Jan Kempa ◽

Wojciech Sorociak

Keyword(s):

Qualitative Evaluation ◽

Thermoplastic Elastomer ◽

Asphalt Binders ◽

Cohesion Energy ◽

Modified Bitumen ◽

Styrene Copolymer ◽

Bituminous Mixtures ◽

Styrene Butadiene Styrene ◽

Styrene Butadiene ◽

Butadiene Styrene

The requirements imposed on road pavements are ever increasing nowadays, necessitating the improvement of the properties of paving materials. The most commonly used paving materials include bituminous mixtures that are composed of aggregate grains bound by a bituminous binder. The properties of bitumens can be improved by modification with polymers. Among the copolymers used for modifying bitumens, styrene–butadiene–styrene, a thermoplastic elastomer, is the most commonly used. This article presents the results of tests conducted on bitumens modified with two types of styrene–butadiene–styrene copolymer (linear and radial). Two bitumen types of different penetration grades (35/50 and 160/220) were used in the experiments. The content of styrene–butadiene–styrene added to the bitumen varied between 1% and 6%. The results of the force ductility test showed that cohesion energy can be used for qualitative evaluation of the efficiency of modification of bitumen with styrene–butadiene–styrene copolymer. The determined values of the cohesion energy were subjected to the original analysis taking into account the three characteristic elongation zones of the tested binders. The performed analyses made it possible to find a parameter whose values correlate significantly with the content of styrene–butadiene–styrene copolymer in the modified bitumen. With smaller amounts of added modifier (approximately 2%), slightly better effects were obtained in the case of linear copolymer styrene–butadiene–styrene and for larger amounts of modifier (5–6%) radial copolymer styrene–butadiene–styrene was found to be more effective. This is confirmed by the changes in the binder structure, as indicated by the penetration index (PI).

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Assessment of the viscoelastic properties of modified bitumens containing styrene-butadiene-styrene copolymer

The Baltic Journal of Road and Bridge Engineering ◽

10.3846/bjrbe.2015.38 ◽

2015 ◽

Vol 10 (4) ◽

pp. 299-308 ◽

Cited By ~ 2

Author(s):

Mieczysław Słowik

Keyword(s):

Tensile Test ◽

Elastic Recovery ◽

Asphalt Binders ◽

Modified Bitumen ◽

Styrene Copolymer ◽

Styrene Butadiene Styrene ◽

Styrene Butadiene ◽

Temperature Susceptibility ◽

Butadiene Styrene

The viscoelastic behaviour of styrene-butadiene-styrene copolymer modified asphalt binders during tensile test and inverse creep test (retarded strain recovery after unloading) has been analysed in the presented paper. Laboratory tests have been conducted on two specimens of road bitumen: 20/30 and 50/70 penetration grade, which have been subjected to modification with the additive of 9% concentrate of SBS elastomer modified bitumen. When the two were mixed, the samples of polymer modified binders containing 3% or 6% by mass of the SBS elastomer were obtained. Force-ductility (tensile) test that has been followed by the extended procedure for the determination of elastic recovery, has been used as the research method. The results of the study have showed a significant improvement of the effect of modifications on the elastic properties and the temperature susceptibility reduction obtained only in the case of binders, where the polymer constitutes a dispersing phase forming a continuous network throughout the bitumen. Moreover, the temperature susceptibility coefficients, defined on the basis of the tensile test results, have been proposed as an alternative or extension to the previously widely used parameter, the Penetration Index.

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Relationship between fractal, viscoelastic, and aging properties of linear and radial styrene–butadiene–styrene polymer-modified bitumen

Journal of Elastomers & Plastics ◽

10.1177/0095244314538437 ◽

2014 ◽

Vol 48 (1) ◽

pp. 14-46 ◽

Cited By ~ 7

Author(s):

Želimir Jelčić ◽

Vesna Ocelić Bulatović ◽

Vesna Rek ◽

Kristina Jurkaš Marković

Keyword(s):

Modified Bitumen ◽

Aging Properties ◽

Styrene Butadiene Styrene ◽

Styrene Butadiene ◽

Polymer Modified Bitumen ◽

Butadiene Styrene

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The modification of bitumen with styrene–butadiene–styrene, ethylene vinyl acetate and varying the amount of reactive ethylene terpolymer

Journal of Elastomers & Plastics ◽

10.1177/0095244317708590 ◽

2017 ◽

Vol 50 (3) ◽

pp. 241-255 ◽

Cited By ~ 1

Author(s):

Seyfullah Keyf

Keyword(s):

Vinyl Acetate ◽

Softening Point ◽

Elastic Recovery ◽

Ethylene Vinyl Acetate ◽

Modified Bitumen ◽

Penetration Index ◽

Different Types ◽

Styrene Butadiene Styrene ◽

Styrene Butadiene ◽

Butadiene Styrene

In this article, 50/70 penetration grade TUPRAS bitumen was modified. Reactive elastomeric terpolymer (Elvaloy RET; DuPont Company), ethylene vinyl acetate (EVA) and styrene–butadiene–styrene (SBS) polymers were used in bitumen modification. Set hours of the tests were applied to samples taken from the obtained modified bitumen mixture. Varying amount of reactive ethylene terpolymer with weight ratios of 0.5%, 1.0%, 1.5%, 2.0% and 2.5% were introduced to the mixture of raw bitumen with 1.0% SBS and 1.0% EVA. Penetration, penetration index, softening point, ductility and elastic recovery tests were performed with these modified bitumen and raw bitumen. The samples of raw bitumen and modified bitumens of 2.0% Elvaloy RET, 1.0% SBS and 1.0% EVA were investigated by means of IR spectroscopy. The raw bitumen was modified with SBS, EVA and RET, and it was determined that penetration and ductility values were decreased while penetration index, softening point and elastic recovery were increased. The purpose of this study is to research the improving properties of 50/70 penetration grade–modified bitumen used in highways of Turkey. The most important characteristics (such as softening point, penetration and % elastic recovery) of new polymer-modified bitumen (NPMB) containing 2.5% EVA, 1% RET and 1% SBS were compared with eight different types of polymer-modified bitumens in Turkey (TPMB). NPMB provided all required parameters (softening point, penetration and % elastic recovery) for five different types of TPMBs (TPMB 70-16, TPMB 70-22, TPMB 76-16, TPMB 76-22 and TPMB 82-16).

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