Preparation and properties of montmorillonite modified asphalts

Yu, Jianying; Zeng, Xuan; Wu, Shaopeng; Wang, Lin; Liu, Gang

doi:10.1016/j.msea.2006.10.037

Cited by 192 publications

(68 citation statements)

References 20 publications

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“…In addition, it is also known that organomodified clay had a positive effect on the rheological behavior of the asphalt binder. 24,25 Thus, it was chosen a proportion of 2.5% SBS and 2.5% organoclays MB which can result in comparable effect with respect to 4.0% SBS MB.…”

Section: Methodsmentioning

confidence: 99%

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Asphalt binders modified by SBS and SBS/nanoclays: effect on rheological properties

Pamplona¹,

Amoni²,

Alencar³

et al. 2012

J. Braz. Chem. Soc.

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Neste trabalho, investigou-se o efeito da vermiculita e montmorilonita organicamente modificadas (OVMT e OMMT, respectivamente) em ligante asfáltico (AB) modificado por SBS (butadieno-estireno-butadieno). As propriedades físicas e reológicas foram avaliadas para AB, 4,0% SBS MB e nanocompósitos AB modificados por 2,5% SBS com 2,5% de organoargilas. Os ligantes modificados (MB) resultaram no aumento do módulo complexo (G*) e na redução do ângulo de fase (δ), o que significa maior resistência destes à deformação permanente. A viscosidade, penetração e suscetibilidade térmica foram adequadas. Nos diagramas black, observou-se que o efeito da presença das nanoargilas OVMT e OMMT foi semelhante ao efeito da Cloisite ® . As propriedades reológicas dos nanocompósitos foram comparáveis às do 4,0% SBS MB, identificando uma redução de custos, dado o potencial de substituição de polímero pela argila. A presença da OVMT melhorou a estabilidade à estocagem do SBS MB, um resultado importante, visto que a separação de fases é um dos maiores obstáculos ao uso do SBS na pavimentação.In this work, it was investigated the effect of organically modified vermiculite and montmorillonite (OVMT and OMMT, respectively) in asphalt binders (AB) modified by SBS (styrene-butadiene-styrene). The physical and rheological properties were performed for AB, 4.0% SBS MB and nanocomposite AB modified by 2.5% SBS with 2.5% of organoclays. The modified binders (MB) result in the enhancement of complex modulus (G*) and reduction of phase angle (δ), which means greater resistance to permanent deformation. The viscosity, penetration and thermal susceptibility were appropriate. The black diagrams show that the effect of nanoclays OVMT and OMMT was similar to the effect of Cloisite ® . The rheological properties of the nanocomposite were comparable to the 4.0% SBS MB, identifying a cost reduction due to the potential of replacing polymer with clay. The presence of OVMT improved the storage stability of SBS MB, an important result, as the phase separation is a major obstacle to the use of SBS in paving. Keywords: asphalt binder, SBS, montmorillonite, vermiculite, rheology IntroductionPetroleum asphalt has been widely used as binder in road pavements to provide adhesive and protective coating to aggregates. The rheological behavior of a binder is complex, varying from viscous to elastic depending on loading rate and temperature. It has to be fluid enough at high temperature when pumped and mixed with aggregates and has to be stiff enough at service temperature so that, it can resist rutting. In addition, it can not be too stiff in order to avoid thermal cracking. Thus, rheological properties of asphalt binders are of major concern since they are directly related to the field performance.For many years, conventional pure asphalt performed satisfactorily. Due to the increase of traffic loads and also to environmental factors, pure asphalt does not always perform as it is expected. Polymer modified asphalts were developed to overcome distress problems. 1-3 The...

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Section: Methodsmentioning

confidence: 99%

“…24,25 The effect of modifying the asphalt with SBS/MMT was also positive in terms of rheological and empirical properties. 26 The use of kaolinite clay (KC) in styrene-ethylene-butadiene-styrene block copolymer (SEBS) has also been proposed for application in asphalt binders.…”

Section: Introductionmentioning

confidence: 91%

Asphalt binders modified by SBS and SBS/nanoclays: effect on rheological properties

Pamplona¹,

Amoni²,

Alencar³

et al. 2012

J. Braz. Chem. Soc.

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“…The pristine asphalt without LDHs was also prepared following the same procedures due to oxidation in hot mixing process. 14 …”

Section: Preparation Of Ldh Modified Asphaltmentioning

confidence: 99%

Intercalation of p-methycinnamic acid anion into Zn-Al layered double hydroxide to improve UV aging resistance of asphalt

Peng

Dai²,

et al. 2015

AIP Advances

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A UV absorber, p-methycinnamic acid (PMCA), was intercalated into Zn-Al layered double hydroxide (LDH) by calcination recovery. Fourier transform infrared spectroscopy showed that the PMCA anions completely replaced the CO32− anions in the interlayer galleries of Zn-Al-LDH containing PMCA anions (Zn-Al-PMCA-LDH). X-ray diffraction and transmission electron microscopy showed that the interlayer distance increased from 0.78 nm to 1.82 nm after the substitution of PMCA anions for CO32− anions. The similar diffraction angles of the CO32− anion-containing Zn-Al-LDH (Zn-Al-CO32−-LDH) and the Zn-Al-CO32−-LDH/styrene–butadiene–styrene (SBS) modified asphalt implied that the asphalt molecules do not enter into the LDH interlayer galleries to form separated-phase structures. The different diffraction angles of Zn-Al-PMCA-LDH and Zn-Al-PMCA-LDH/SBS modified asphalt indicated that the asphalt molecules penetrated into the LDH interlayer galleries to form an expanded-phase structure. UV-Vis absorbance analyses showed that Zn-Al-PMCA-LDH was better able to block UV light due to the synergistic effects of PMCA and Zn-Al-LDH. Conventional physical tests and atomic force microscopy images of the SBS modified asphalt, Zn-Al-CO32−-LDH/SBS modified asphalt and Zn-Al-PMCA-LDH/SBS modified asphalt before and after UV aging indicated that Zn-Al-PMCA-LDH improved the UV aging resistance of SBS modified asphalts.

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“…Therefore, the Nano clay-modified asphalt was determined to have good rutting resistance compared to the original asphalt or the SBSmodified asphalt. It was found that MMT-modified asphalt may form an intercalated structure, whereas the OMMT modified asphalt may form exfoliated structure based on the X-ray diffraction (XRD) results [22][23].…”

Section: Literature Reviewmentioning

confidence: 99%

Effect of using Nano clay to improve Asphalt materials

Abou¹,

Sabry²,

Elshrief³

2015

Third International Conference on Advances in Civil, Structural and Construction Engineering - CSCE 2015

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Abstract---The objective of this study is to review existing literature in the area of Nano-modification of asphalt and proceed to apply Nano-materials to asphalt to improve the performance. This study integrates literature review, preparation and characterization of Nano-modified asphalt materials. This study including aggregate tests to prove that these aggregate accepted to use it in asphalt binder, and tests of used bitumen samples. In this study the experimental testing three types of Nano clay (A, B, C) at 2% and 4% by the weight of asphalt were blended in asphalt binder at high temperature to exfoliate the Nano clay within the asphalt. The asphalt binder was then characterized using the AASHTO viscosity, penetration test, softening point, flash point and Marshall Test. These types of additives of Nano-clay are increasing the viscosity by increasing the percent of Nano clay and decreasing the penetration by increasing the percent of Nano clay but not affected with softening point and flash point. About Marshall Stability there are many changes: In case of adding Nano clay (A-2%) Marshall Stabilization decrease; although it increased again when adding Nano clay (A-4%) but not reached to the original sample stabilization. In case of adding Nano clay (B-2% and 4%) it still increase. In case of adding Nano clay (C-2%) it increased; although when adding Nano clay (C-4%) it decreases again (bell shape).

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Preparation and properties of montmorillonite modified asphalts

Cited by 192 publications

References 20 publications

Asphalt binders modified by SBS and SBS/nanoclays: effect on rheological properties

Asphalt binders modified by SBS and SBS/nanoclays: effect on rheological properties

Intercalation of p-methycinnamic acid anion into Zn-Al layered double hydroxide to improve UV aging resistance of asphalt

Effect of using Nano clay to improve Asphalt materials

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