Study on properties and mechanism of organic montmorillonite modified bitumens: View from the selection of organic reagents

Jia, Meng; Zhang, Zengping; Wei, Long; Wu, Xingjiao; Cui, Xin; Zhang, Hongliang; Lv, Wei; Zhang, Qiang

doi:10.1016/j.conbuildmat.2019.05.074

Cited by 29 publications

(23 citation statements)

References 43 publications

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“…So, the small S value and large m-value are desirable for bitumen. From Figure 9, the incorporation of layered silicates significantly enhanced the S value while reducing the m-value, demonstrating that layered silicates are deficient in the low-temperature cracking-resistance of bitumen, which has been reported [18]. Among these modified bitumens, the REC-modified bitumen had the largest S value, followed by OREC-modified bitumen, MMT-modified bitumen, and OMMT-modified bitumen which ranked lowest.…”

Section: Bbrmentioning

confidence: 54%

“…Therefore, OREC has the largest specific surface area to hinder the motion of the bitumen molecules (or the flowability of bitumen) most effectively. However, although organophilic OMMT has a smaller aspect ratio and interlayer space than hydrophilic REC, it has a better compatibility with bitumen due to the organic treatment, which helps to enhance the specific surface area of OMMT particles in the bitumen matrix [17,18]. Additionally, it can also be noted that, in Figure 4, the temperature dependency of the viscosity was obvious, as the viscosity reduced nearly linearly with the temperature.…”

Section: Viscositymentioning

confidence: 94%

“…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%

“…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.…”

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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Section: Bbrmentioning

confidence: 54%

Section: Viscositymentioning

confidence: 94%

mentioning

confidence: 99%

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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“…Additionally, MMT can be transformed into organic montmorillonite (OMMT) through organic modification. After modification, the spacing between the layers of OMMT increases, making it easier for asphalt molecules to intercalate [25]. Another potential nanoclay is calcined-layered double hydrotalcite (LDH).…”

Section: Introductionmentioning

confidence: 99%

Effect of Nanoclays on Moisture Susceptibility of SBS‐Modified Asphalt Binder

Wang

Guo

Yang

et al. 2020

Advances in Materials Science and Engineering

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Moisture susceptibility plays an important role in the damage of asphalt pavement. Failure occurs when asphalt is removed from the aggregate particles due to the decreased adhesion between the asphalt and aggregate in comparison with that between water and the aggregate. In recent years, efforts utilizing nanomaterials to improve the diverse properties of asphalt have proven to be effective. In this study, three types of nanoclays were used to modify styrene-butadiene-styrene- (SBS-) modified asphalt. The resistances to water damage of the modified binders were evaluated using the surface free energy (SFE) and atomic force microscopy (AFM). The results revealed that the total SFE decreased and the energy ratio (ER) increased when the asphalt binder was modified with the nanoclays, indicating that the addition of nanoclays can improve the moisture resistance of these aggregate-binder systems. After immersion, a decreased amount of bee structures was observed in both the SBS and nanoclay-modified asphalts due to the interactions between water and bitumen. However, the residual amount of bee structures was higher in the nanoclay-modified asphalts than in the SBS-modified asphalt, indicating that the addition of nanoclay makes the surface morphology of asphalt more resistant to water damage. Finally, freeze-thaw splitting tests were used to verify the results obtained through the SFE and AFM tests.

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Preparation of polyacrylamide–montmorillonite nanocomposite and its application in Cr(III) adsorption

Qiu

Komarneni

et al. 2020

J of Applied Polymer Sci

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The polyacrylamide–montmorillonite “water in water” (PAM‐MMT W/W) emulsion was prepared by dispersion polymerization method in the presence of organo‐montmorillonite (OMMT). Based on the analysis of the polymerization process, the structure of material was investigated using thermogravimetry, Fourier transform infrared spectroscopy, X‐ray diffractometry, scanning electron microscopy, and transmission electron microscopy experiments. Here, the dispersion was determined to be a blend of PAM W/W emulsion and PAM network interspersed by MMT particles, this unique structure of the material was considered to provide better adsorption ability compared to PAM without MMT. Therefore, a PAM‐MMT adsorbent was made from the PAM‐MMT W/W emulsion, and its adsorption capacity toward Cr(III), one of the heavy metal pollutants from the tannery waste was investigated. The PAM‐MMT nanocomposite was demonstrated to have good Cr(III) removal performance, the maximum adsorption capacity of the nanocomposite was found to be 59.74 mg/g at a pH of 5.5 and temperature of 70°C. Results show that pseudo‐second‐order kinetic model and Langmuir isotherm were applicable for Cr(III) adsorption.

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Study on properties and mechanism of organic montmorillonite modified bitumens: View from the selection of organic reagents

Cited by 29 publications

References 43 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 Nanoclays on Moisture Susceptibility of SBS‐Modified Asphalt Binder

Preparation of polyacrylamide–montmorillonite nanocomposite and its application in Cr(III) adsorption

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