Physical properties and microstructures of organic rectorites and their modified asphalts

Zhang, Zengping; Jia, Meng; Jiao, Wenxiu; Qi, Bing; Liu, Haiting

doi:10.1016/j.conbuildmat.2018.01.163

Cited by 34 publications

(13 citation statements)

References 29 publications

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“…In general, the nanostructure of asphalt includes two‐phase states: the dispersed phase represented by a “bee‐like” structure and the continuous phase represented by light components. The formation of a “bee‐like” structure mainly results from the content of microcrystalline asphaltenes and waxes . Changes in the molecular composition in asphalt can have some effects on the shape and size of the “bee‐like” structure.…”

Section: Resultsmentioning

confidence: 99%

Investigation of physiochemical and rheological properties of waste cooking oil/SBS/EVA composite modified petroleum asphalt

Liu

Zhou²,

Peng³

et al. 2019

J of Applied Polymer Sci

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The objective of this research is to investigate the physiochemical and rheological properties of waste cooking oil (WCO)/styrene‐b‐butadiene‐b‐styrene/ethylene vinyl acetate (SBS/EVA) composite modified asphalt. A petroleum asphalt composite modified with SBS/EVA and oil/SBS/EVA were prepared to undergo the physical, rheological, and microscopic experiments. Comparing these tests results with the properties of unmodified petroleum asphalt, SBS and EVA cause an improvement in pavement performance, but weaken the storage stability. Although the high‐temperature performance undermined by the addition of WCO, the thermal stability, fatigue property, and low temperature crack resistance improved obviously. In addition, WCO mainly composed by low‐weight components, and these can supplement the light components in the polymer‐modified asphalt. EVA could increase the percentage of large molecular size of asphalt, while WCO relieves this trend. The reactions between WCO and these polymers (SBS and EVA) are physical reactions. Atomic force microscopy morphology results reflect that SBS and EVA increase the surface complexity and roughness, and WCO makes the asphalt surface smooth. This indicates WCO increases the dispersion of polymers in asphalt. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48828.

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Section: Resultsmentioning

confidence: 99%

Investigation of physiochemical and rheological properties of waste cooking oil/SBS/EVA composite modified petroleum asphalt

Liu

Zhou²,

Peng³

et al. 2019

J of Applied Polymer Sci

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“…This demonstrates that the organic reagent embellishes irregular edges. More precisely, organic reagent molecules are able to form tight ion pairs with the layered silicates by adsorbing negative charges that exist on the surface, as well as to enter interlayers of the layered silicates through the reaction with exchangeable cations [17,21]. By comparing Figure 2c,d, it can be obtained that OREC had a larger-sized platelet than OMMT.…”

Section: Methodsmentioning

confidence: 92%

“…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]. In detail, OREC is characterized by the largest interlayer space (obtained from Figure 4) and aspect ratio amongst these four silicates.…”

Section: Viscositymentioning

confidence: 99%

“…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].…”

mentioning

confidence: 99%

“…Many organic reagent molecules can enter the MMT interlayers, thereby endowing MMT with excellent lipophilicity and great expansibility [30][31][32]. Therefore, organic montmorillonite (OMMT) particles with a large specific surface area are capable of effectively blocking the thermal motion of bitumen molecules, leading to the excellent thermal stability and aging resistance of OMMT-modified bitumen [17,33]. By comparison, rectorite (REC) has a layered structure similar to MMT, which is composed of alternate pairs of a non-expansible dioctahedral mica-like layers and expansible dioctahedral montmorillonite-like layers, in a 1:1 ratio [24,31,34].…”

mentioning

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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Heterogeneous Fenton-like oxidative degradation of sulfanilamide catalyzed by RuO2-rectorite composite

2021

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Physical properties and microstructures of organic rectorites and their modified asphalts

Cited by 34 publications

References 29 publications

Investigation of physiochemical and rheological properties of waste cooking oil/SBS/EVA composite modified petroleum asphalt

Investigation of physiochemical and rheological properties of waste cooking oil/SBS/EVA composite modified petroleum asphalt

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

Heterogeneous Fenton-like oxidative degradation of sulfanilamide catalyzed by RuO2-rectorite composite

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