Temperature regulation and rheological properties assessment of asphalt binders modified with paraffin/ SiO2 micro-encapsulated phase change materials

Wang, Xueting; Wu, Yongchang; Kuang, Dongliang; Wu, Siyu

doi:10.1016/j.conbuildmat.2023.130377

Cited by 22 publications

(2 citation statements)

References 28 publications

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“…This provides solutions and a scientific basis for studying asphalt compatibility, reducing asphalt pavement diseases, and improving pavement service life and durability [ 6 ]. In recent years, many new nanomaterials, such as ZnO [ 7 , 8 ], TiO 2 [ 9 , 10 ], CaCO 3 [ 11 ], SiO 2 [ 12 ], and CeO 2 [ 13 ], have been widely used in asphalt to enhance specific properties of asphalt. Zhu [ 14 ] investigated the road performance of nano ZnO-modified asphalt.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Nano-ZnO-Modified Asphalt Compatibility Based on Molecular Dynamics

Xie

Zhai

2023

Materials

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Nano-ZnO has a large specific surface area, small particle size, and strong polarity and can be used as an additive to modify the base asphalt. In this paper, the compatibility mechanism between nano-ZnO modifier and asphalt is analyzed. Solubility parameters, interaction energNano-ZnO and mean square displacement of nano-ZnO in matrix asphalt were calculated at different temperatures to study the compatibility of the nano-ZnO modifier and the matrix asphalt. The radial distribution functions and radii of gyration of the asphalt’s four components under the action of the nano-ZnO additive were calculated to investigate the effect of nano-ZnO on the molecular structure of the asphalt. The results show that the best compatibility between nano-ZnO and matrix asphalt is observed at 150 °C, especially when the nano-ZnO particle size was 6 Å. The particle sizes of nano-ZnO have little effect on the temperature at which the nano-ZnO-modified asphalt achieved its highest structural stability. Around 150 °C, the nano-ZnO-modified asphalt system with different particle sizes exhibit the highest stability and best compatibility. The addition of nano-ZnO improves the compactness of the asphalt structure and makes the asphalt more stable.

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Section: Introductionmentioning

confidence: 99%

Analysis of Nano-ZnO-Modified Asphalt Compatibility Based on Molecular Dynamics

Xie

Zhai

2023

Materials

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“…Furthermore, Ref. [12] investigated the cooling effect of paraffin/SiO 2 microencapsulated phase change material (MPCM) in asphalt binders. In addition, the phase transition temperature was chosen as 53.64 • C to mitigate the urban heat island.…”

Section: Introductionmentioning

confidence: 99%

Rheological, Spectroscopic, and Chemical Characterization of Asphalt Binders Modified with Phase Change Materials, Polymers, and Glass Powder

Almutairi

Baaj

2023

Applied Sciences

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Recently, asphalt modifiers have increasingly gained attention for improving the mechanical and thermal characteristics of asphalt mixtures. As a result, innovative additives are being constantly developed to achieve this purpose. However, some modifiers can significantly impact the chemical and rheological properties of the asphalt binder. This paper investigates the rheological, spectroscopic, and chemical properties of asphalt binders modified with a bio-based phase change material (PCM) and phase change material mixed with glass powder (GPCM). Two binders were investigated, PG 58-28 and PG 70-28 polymer modified asphalt binder with 3% SBS. Two different percentages of GPCM (5% and 7%) were added to PG 58-28 and PG 70-28, and 5% PCM was added to PG 58-28. The results indicated that the PCMs effectively reduced the viscosity values of the asphalt binder. Moreover, testing the modified binders using differential scanning calorimetry (DSC) showed that the PCMs released the stored heat when the melting/freezing temperature was reached. However, adding glass powder with the PCMs negatively affected the thermal properties of PCMs in the asphalt mix. In addition, considerable changes in the stiffness of the binders modified with GPCM at an intermediate temperature were obtained when tested using DSR. Finally, the TGA results revealed that this specific type of PCM would not be suitable as a hot mix asphalt (HMA) modifier as its evaporation temperature is lower than the mixing temperature HMA. However, the use of PCM in warm mix asphalt (WMA) would be a more viable option. The results showed that the evaporation temperature for the PCMs was low; therefore, the PCMs cannot be used in HMA. In addition, modified binders with PCMs and GPCM showed lower viscosity compared to the control binder. The DSR rheological analysis showed that the control binder and 5%PCM, 5%GPCM, 7%GPCM, 5%GPCM, and 7%GPCM binders had similar overall properties. However, the addition of GPCM significantly decreases the stiffness at intermediate temperatures.

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