Recycling waste disposable medical masks in improving the performance of asphalt and asphalt mixtures

Zhao, Zenggang; Wu, Shaopeng; Liu, Quantao; Xie, Jun; Yang, Chao; Wang, Fusong; Wan, Pei

doi:10.1016/j.conbuildmat.2022.127621

Cited by 34 publications

(28 citation statements)

References 40 publications

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“…According to previous study [ 9 , 10 ], the DM modifier dosing was selected as 1%, 2%, 3%, 4% of the total weight of the base asphalt. The preparation process of DM-modified asphalt: firstly, the base asphalt was heated to 165 °C and stirred for 10 min at 500 r/min using a high speed shear machine.…”

Section: Methodsmentioning

confidence: 99%

“…Currently, several studies have emerged on the road performance of discarded masks (DM). Zhao et al simply crushed the DM and added them to the base asphalt and found that DM could improve the high and low temperature properties of the asphalt [ 9 ]. Yalcin et al found that modified asphalt containing more than 2% DM was better than modified asphalt containing more than 3% SBS in terms of physical properties and rheological performance [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

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Multi-Scale Characterization of High-Temperature Properties and Thermal Storage Stability Performance of Discarded-Mask-Modified Asphalt

Hui

Yang

et al. 2022

Materials

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In the context of the global pandemic of COVID-19, the use and disposal of medical masks have created a series of ethical and environmental issues. The purpose of this paper is to study and evaluate the high temperature properties and thermal storage stability of discarded-mask (DM)-modified asphalt from a multi-scale perspective using molecular dynamics (MD) simulation and experimental methods. A series of tests was conducted to evaluate the physical, rheological, thermal storage stability and microscopic properties of the samples. These tests include softening point, rotational viscosity, dynamic shear rheology (DSR), Fourier transform infrared (FT-IR) spectroscopy and molecular dynamics simulation. The results showed that the DM modifier could improve the softening point, rotational viscosity and rutting factor of the asphalt. After thermal storage, the DM-modified asphalt produced segregation. The difference in the softening point between the top and bottom of the sample increased from 2.2 °C to 17.1 °C when the DM modifier admixture was increased from 1% to 4%. FT-IR test results showed that the main component of the DM modifier was polypropylene, and the DM-modified asphalt was mainly a physical co-blending process. MD simulation results show that the DM modifier can increase the cohesive energy density (CED) and reduce the fractional free volume (FFV) of asphalt and reduce the binding energy between base asphalt and DM modifier. Multi-scale characterization reveals that DM modifiers can improve the high temperature performance and reduce the thermal storage stability of asphalt. It is noteworthy that both macroscopic tests and microscopic simulations show that 1% is an acceptable dosage level.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multi-Scale Characterization of High-Temperature Properties and Thermal Storage Stability Performance of Discarded-Mask-Modified Asphalt

Hui

Yang

et al. 2022

Materials

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“…The creep time was 1 s, and the recovery time was 9 s in a single cycle. The test was conducted at 58 • C, and the calculation equation of R, J nr , and J nr-diff are as follows [33,34]:…”

Section: High-temperature Rheological Properties Testsmentioning

confidence: 99%

“…When the total content of WTR and SSP is constant, the softening point of asphalt modified with WTR and SSP gradually decreases, and the penetration is contrary to the decrease in the ratio of WTR to SSP. The Arrhenius Equation ( 14) is widely used in describing the viscosity-temperature relationship of asphalt [33]:…”

Section: Physical Propertiesmentioning

confidence: 99%

Performance Evaluation of Asphalt Modified with Steel Slag Powder and Waste Tire Rubber Compounds

et al. 2022

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As two kinds of solid wastes, waste tires and steel slag have caused serious threats to the environment. Both waste tire rubber (WTR) and steel slag powder (SSP) can improve the performance of asphalt, while the performance indexes and modification mechanism of modified asphalt are not clear. In this paper, asphalt modified with SSP and WTR was prepared, and its performance was evaluated. The physical properties of asphalt modified with SSP and WTR, including penetration, the softening point, and viscosity, were investigated. Furthermore, high-temperature performance, fatigue resistance, low-temperature performance, and blending mechanism of asphalt modified with SSP and WTR were tested with a dynamic shear rheometer (DSR), bending beam rheometer (BBR), and Fourier transform infrared spectrometer (FTIR). The results showed that with the same content of WTR and SSP, WTR reveals a more significant modification effect on physical properties, fatigue, and low-temperature performance of base asphalt than SSP. The anti-rutting performance of SSP-modified asphalt is better than that of WTR-modified asphalt at 30~42 °C, and the anti-rutting performance of WTR-modified asphalt is better than that of SSP-modified asphalt at 42~80 °C. When the total content of WTR and SSP is the same, the physical properties, high-temperature resistance, fatigue resistance, and low-temperature performance of the asphalt modified with WTR and SSP decrease with the decrease in the ratio of WTR and SSP, and their performance is between WTR-modified asphalt and SSP-modified asphalt. Infrared spectrum results verified that the preparation of WTR- and SSP-modified asphalt is mainly a physical blending process. Overall, this research is conducive to promoting the application of modified asphalt with WTR and SSP in the construction of high-standard pavement.

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“…Additionally, L-DMA-modified asphalt with different L-DMA contents were tested by loading–unloading mode in the Multiple Stress Creep and Recovery (MSCR) test, which can be used to characterize the high-temperature performance of asphalt [ 28 ]. In this paper, the MSCR tests under stresses of 0.1 kPa and 3.2 kPa were carried out at 58 °C.…”

Section: Materials and Experimentsmentioning

confidence: 99%

Bionic Synthesis of Mussel-like Adhesive L-DMA and Its Effects on Asphalt Properties

Liu

2022

Materials

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Cracks are inevitable during the service life of asphalt pavement and the water at the fracture surfaces tends to cause the grouting materials to fail. Studies have shown that the catechol groups in adhesion proteins secreted by mussels can produce strong adhesion performance in the water. In this paper, the mussel-like adhesive L-Dopa Methacrylic anhydride (L-DMA) was prepared based on the concept of bionic design and used to improve the properties of asphalt. By using Fourier-transform infrared spectroscopy (FTIR) and Thermogravimetric analysis (TGA), the thermal stability and structural composition of L-DMA were investigated. Then, the rheological and low-temperature properties of L-DMA-modified asphalt were investigated using the dynamic shear rheological (DSR) test and bending beam rheological (BBR) test. Moreover, the modification mechanism was explored by FTIR. It was found that L-DMA can be effectively synthesized and has good thermal stability. The incorporation of L-DMA increases the composite modulus, viscosity, creep recovery rate and rutting factor of asphalt binder, resulting in an enhancement of its high-temperature performance. At a high L-DMA content of 10%, the low-temperature performance of the modified asphalt was enhanced. The modification of L-DMA to asphalt is mainly a physical process. Hydrogen bonds and conjugated systems generated by the introduction of catechol groups enhance the adhesion properties of asphalt. In general, L-DMA improves the properties of asphalt and theoretically can improve the water resistance of asphalt, which will be explored in future research.

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Recycling waste disposable medical masks in improving the performance of asphalt and asphalt mixtures

Cited by 34 publications

References 40 publications

Multi-Scale Characterization of High-Temperature Properties and Thermal Storage Stability Performance of Discarded-Mask-Modified Asphalt

Multi-Scale Characterization of High-Temperature Properties and Thermal Storage Stability Performance of Discarded-Mask-Modified Asphalt

Performance Evaluation of Asphalt Modified with Steel Slag Powder and Waste Tire Rubber Compounds

Bionic Synthesis of Mussel-like Adhesive L-DMA and Its Effects on Asphalt Properties

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