Effects of montmorillonite (Mt) and two different organo-Mt additives on the performance of asphalt

Vargas, M.A.; Moreno, Leonardo; Montiel, R.; Manero, Ο.; Vazquez, Humberto C. Godinez

doi:10.1016/j.clay.2017.01.009

Cited by 48 publications

(17 citation statements)

References 35 publications

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“…Aiming at investigating the effect of the layered silicate type on the flowability and high-temperature properties of virgin bitumen, the viscosity of all bitumen specimens at four high temperatures (120 • C, 135 • C, 150 • C, and 165 • C) is provided ( Figure 4). As expected, viscosity increased with the incorporation of the modifiers, which can be attributed to the restriction of the modifiers on the motion of the bitumen molecules [29,33,36]. With respect to the modifier type, regardless of the test temperature, OREC endowed the virgin bitumen with the largest viscosity, contrary to MMT, and there was a similar viscosity for the REC-modified bitumen and the OMMT-modified bitumen, which is probably related to the specific surface area of the layered silicates in the bitumen matrix [17,36].…”

Section: Viscositysupporting

confidence: 73%

“…In addition, the interlayer space of the pristine layered silicates is expanded [20,26,27]. Most studies have been conducted regarding montmorillonite (MMT) as a bitumen modifier [18,28,29], the main reason of which is that MMT is a 2:1 layered smectite clay with two silica tetrahedral sheets sandwiching an alumina octahedral sheet [29,30]. There exists a large amount of exchangeable cations (i.e., cation exchange capacity) between the 2:1 layers.…”

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confidence: 99%

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High- and Low-Temperature Properties of Layered Silicate-Modified Bitumens: View from the Nature of Pristine Layered Silicate

et al. 2019

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Layered silicates, as bitumen modifiers, have received increasing attention. The main objective of this study was to evaluate the influence of layered silicates on bitumen properties. For this study, montmorillonite (MMT), rectorite (REC), organic montmorillonite (OMMT), and organic rectorite (OREC) were selected. The layered structure type of layered silicates was characterized by SEM (scanning electron microscope) and XRD (X-ray diffraction diffractometer). Tests for determining high-temperature properties included viscosity, DSR (dynamic shear rheometer), and TG (thermogravimetry) tests, and studies for determining the low-temperature properties were conducted by BBR (bending beam rheometer) and DSC (differential scanning calorimetry) tests. Our results show that MMT, REC, OMMT, and OREC were all intercalated structures. OREC had the largest d 001 interlayer space, followed by REC, OMMT, and MMT. OREC improved the high-temperature property of virgin bitumen more effectively than OMMT. Meanwhile, REC-modified bitumen exhibited a high-temperature property similar to OMMT-modified bitumen. When compared with REC and OREC, MMT and OMMT were less efficient in reducing the low-temperature properties of virgin bitumen, and OMMT was the least efficient. Therefore, it can be concluded that the nature of pristine layered silicates has a great impact on the high-and low-temperature properties of bitumen. Moreover, organic treatment can simultaneously improve the high-and low-temperature properties of layered silicate-modified bitumens. storage stability of polymer-modified bitumens, which results from the physical coexistence between them [7,8].In order to overcome these defects, many novel bitumen modifiers have appeared in recent years, and among them, layered silicates have been paid much attention to [9][10][11][12]. As it is well known, layered silicates are characterized by being one dimension smaller than 100 nm in the dispersed phase [13,14]. It is their small size and large specific surface area that endows them with surface effect, size effect, and barrier effect [12,14,15]. Hence, layered silicates with a small content, in general, largely improve bitumen properties [12,14]. Additionally, they have layered nanostructures in which there are exchangeable cations [16]. Bitumen molecules are able to insert interlayers [9,17,18]. It is these characteristics that make bitumen molecules effectively blocked, thereby improving the high-temperature stability and aging resistance of virgin bitumen [19,20].The layered silicate chiefly consists of montmorillonite, rectorite, vermiculite, hectorte, saponite, and kaolinite [21][22][23][24]. Generally, before incorporation into the bitumen matrix, the hydrophilic layered silicate is converted into an organophilic material by selecting an appropriate organic reagent to react with exchangeable cations, which improves the compatibility of the layered silicate with bitumen [25]. In addition, the interlayer space of the pristine layered silicates is expanded [20,26,27]. Most studi...

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Section: Viscositysupporting

confidence: 73%

mentioning

confidence: 99%

High- and Low-Temperature Properties of Layered Silicate-Modified Bitumens: View from the Nature of Pristine Layered Silicate

et al. 2019

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“…In addition to rheological and chemical characterization, several micro analysis methods were applied for mechanism investigation [22,23,24,25,26], including Scanning Electron Microscope (SEM), Transmission Electron Microscope (TEM), and Atomic Force Microscope (AFM). Especially, AFM is a technique that explores the micro-surface morphology and micro-surface mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of Aging on Chemical and Rheological Properties of Bitumen

Yang

Zhang

et al. 2018

Polymers

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Engineering performance of asphalt pavement highly depends on the properties of bitumen, the bonding material to glue aggregates and fillers together. During the service period, bitumen is exposed to sunlight, oxygen and vehicle loading which in turn leads to aging and degradation. A comprehensive understanding of the aging mechanism of bitumen is of critical importance to enhance the durability of asphalt pavement. This study aims to determine the relations between micro-mechanics, chemical composition, and macro-mechanical behavior of aged bitumen. To this end, the effect of aging on micro-mechanics, chemical functional groups, and rheological properties of bitumen were evaluated by atomic force microscope, Fourier transform infrared spectroscopy and dynamic shear rheometer tests, respectively. Results indicated that aging obviously increased the micro-surface roughness of bitumen. A more discrete distribution of micromechanics on bitumen micro-surface was noticed and its elastic behavior became more significant. Aging also resulted in raised content of carbonyl, sulfoxide, and aromatic ring functional groups. In terms of rheological behavior, the storage modulus of bitumen apparently increased after aging due to the transformation of viscous fractions to elastic fractions, making it stiffer and less viscous. By correlation analysis, it is noted that the bitumen rheological behavior was closely related to its micro-mechanics.

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“…Nanoclay is a type of natural mineral mainly including kaolinite clay (KC), vermiculite (VMT) and montmorillonite (MMT), which has a 2:1 layered structure with two silica tetrahedral sheets sandwiching an alumina octahedral sheet. Nowadays, nanomaterials have been popularly applied as modifiers for construction materials [12,[18][19][20]. Especially, the importance of layered clay minerals, also known as nanoclays, in terms of asphalt modification is gradually increasing.…”

Section: Introductionmentioning

confidence: 99%

“…Nanoclays' remarkable improvement on the rheological properties of asphalt has been widely reported by previous studies. Vargas et al, [18] discovered that Organo-nanocomposite modified-asphalt can generate an intercalated structure using X-ray diffraction (XRD) and transmission electron microscopy (TEM). This indicates that the enhanced rheological properties may ascribe to the interaction behavior of the polymer chains in asphalt binder into the interlayer of clay.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Storage Stability of Different Polymer Modified Asphalt Binders through Nano-Montmorillonite Modification

Ren

Zhu

Wu³

et al. 2020

Nanomaterials

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The storage stability concern, caused by phase separation for the density difference between polymers and asphalt fractions, has limited the widespread application of polymer modified asphalt (PMA). Therefore, this study aims to improve the storage concern of PMA by incorporating nano-montmorillonite. To this end, different nano-montmorillonites were incorporated to three PMAs modified with three typical asphalt modifiers, i.e., crumb rubber (CRM), styrene–butadiene-rubber (SBR) and styrene–butadiene-styrene (SBS). A series of laboratory tests were performed to evaluate the storage stability and rheological properties of PMA binders with nano-montmorillonite. As a consequence, the incorporation of nano-montmorillonite exhibited a remarkable effect on enhancing the storage stability of the CRM modified binder, but limited positive effects for the SBR and SBS modified binders. The layered nano-montmorillonite transformed to intercalated or exfoliated structures after interaction with asphalt fractions, providing superior storage stability. Among selected nano-montmorillonites, the pure montmorillonite with Hydroxyl organic ammonium performed the best on enhancing storage stability of PMA. This paper suggests that nano-montmorillonite is a promising modifier to alleviate the storage stability concern for asphalt with polymer modifiers.

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Effects of montmorillonite (Mt) and two different organo-Mt additives on the performance of asphalt

Cited by 48 publications

References 35 publications

High- and Low-Temperature Properties of Layered Silicate-Modified Bitumens: View from the Nature of Pristine Layered Silicate

High- and Low-Temperature Properties of Layered Silicate-Modified Bitumens: View from the Nature of Pristine Layered Silicate

Effect of Aging on Chemical and Rheological Properties of Bitumen

Enhanced Storage Stability of Different Polymer Modified Asphalt Binders through Nano-Montmorillonite Modification

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