Mechanical properties and reaction mechanism of microwave-activated crumb rubber-modified asphalt before and after thermal aging

Yin, Lei; Yang, Xiaolong; Wu, Hansong; Lyu, Zhenfeng; Li, Bo

doi:10.1016/j.conbuildmat.2020.120773

Cited by 37 publications

(10 citation statements)

References 64 publications

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“…The 40-mesh activated rubber powder was pre-swelled with 20% waste oil. The microwave treatment on rubber powder was selected as 2 min because toxic gases were produced after 2 min, and the rubber powders started to burn (Yin et al, 2021). The rubber powders were obtained from the waste meridian tire plant of Tianjin City, and the detailed properties of the rubber powder can be seen in Table 1.…”

Section: Methodsmentioning

confidence: 99%

Stability Evaluation and Mechanism of Asphalts Modified With Various Rubber Powder Contents

et al. 2021

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Ground tires are one of the main sources of urban solid waste. Rubber powder-modified asphalt provides an effective method to solve the problem, and it presents good high- and low-temperature performance in sustainable pavement construction. However, the storage properties of rubber powder-modified asphalts prepared from the traditional low-temperature shear mixing method are unstable, which restricts their application. In this study, four test methods (the softening-point test; the dynamic shear rheological test; the Laboratory Asphalt Stability Test; and fluorescence image analysis) and six evaluation indexes (the softening-point difference Sdiff, the segregation percentage Sp, the segregation index Ise, the segregation rate Rs, the degradation rate Rd, and the stability index Ist) were employed to analyze the storage abilities of asphalts modified by various activated rubber powder contents. The results show that the storage properties have a positive correlation with rubber powder content in the modified asphalt, and a rubber powder content of 60% is proven to be the optimum mixing amount. The rubber powders can distribute uniformly in the asphalt matrix when mixed below the optimum mixing amount; otherwise a rubber powder agglomeration is formed. The quantitative morphology analysis results are in good agreement with the laboratory test conclusions. The activated rubber powder shows better compatibility compared with ordinary rubber powders and presents a promising method to treat waste ground tires.

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Section: Methodsmentioning

confidence: 99%

Stability Evaluation and Mechanism of Asphalts Modified With Various Rubber Powder Contents

et al. 2021

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“…Complex modulus (G * ), phase angle (δ), and rutting factor (G * /sinδ) were used to evaluate the high temperature rheological properties. e complex modulus G * reflects the ability of asphalt to resist the deformation in shear, with larger values indicating greater resistance to the shear behavior [20,21].…”

Section: Effects On High Temperature Rheological Propertiesmentioning

confidence: 99%

Rheological Properties and Antiaging Performance of Graphene Oxide-Modified Bio-Asphalt

Qian¹,

Li²,

Ding

et al. 2022

Advances in Materials Science and Engineering

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To enhance the performance of bio-asphalt, an attempt was made to modify bio-asphalt using graphene oxide (GO). Two bio-asphalts were prepared and modified with different GO dosage levels of 0 to 0.08% to obtain GO-modified bio-asphalts (GOMBA). The two GOMBA were tested in the conventional properties (penetration, softening point, and ductility), high- and low-temperature rheological properties, and aging properties. The results showed that the penetration decreases and the ductility increases slightly with the increase in the dosage of GO, while the softening point increases stably to the maximum by 17.84%, and 15.99% for the two GOMBA, respectively. GO is beneficial to improve the high temperature performance and the recovery after the deformation of the GOMBA; on the contrary, it does not significantly affect the low temperature cracking resistance of those. The maximum residual penetration ratio is 10.58% and 8.84%, respectively, and the maximum residual ductility is 10.79% and 27.51%, respectively, for the two GOMBA after short-term aging. GO modification plays a role in the change of carbonyl index (CI) and sulfoxide index (SI) of the GOMBA before and after aging based on the FT-IR spectra, indicating that the GO can effectively improve the antiaging performance of bio-asphalt.

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“…As such, foodcontact rubber hoses are used extensively in large-scale dairies to connect the milking collector and liner to transport milk automatically at room temperature. Anti-ageing compounds are added to the rubber hoses during their preparation for stability and longevity (Zhong et al 2018;Yin et al 2021). A globally ubiquitous rubber anti-ageing agent, N-(1,3dimethylbutyl)-N 0 -phenyl-p-phenylenediamine (6PPD), protects rubber from the ageing effects of heat, oxygen and light (Huang et al 2021;Johannessen et al 2021).…”

Section: Introductionmentioning

confidence: 99%

“…2018; Yin et al . 2021). A globally ubiquitous rubber anti‐ageing agent, N‐(1,3‐dimethylbutyl)‐N′‐phenyl‐p‐phenylenediamine (6PPD), protects rubber from the ageing effects of heat, oxygen and light (Huang et al .…”

Section: Introductionmentioning

confidence: 99%

The migration and degradation of N‐(1,3‐dimethylbutyl)‐N′‐phenyl‐p‐phenylenediamine from rubber hoses in milk lines

Yuan

Wang

2023

Int J of Dairy Tech

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N‐(1,3‐dimethylbutyl)‐N′‐phenyl‐p‐phenylenediamine (6PPD), an anti‐ageing agent in rubber hoses used in milk lines, may migrate into the milk and cause safety issues. Thus its migration and degradation in simulants/milk were studied to explore the changing trends and final levels, by high‐performance liquid chromatography. The results showed that 6PPD continuously increased in 95% ethanol and degraded more easily in simulants with a high water content. The degradation may be attributed to the π‐conjugated system of 6PPD and smaller steric hindrance of degradation products. No migration was observed into milk after 10 min. This study provides a novel and effective approach to evaluating 6PPD trends and safety for the dairy industry.

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Mechanical properties and reaction mechanism of microwave-activated crumb rubber-modified asphalt before and after thermal aging

Cited by 37 publications

References 64 publications

Stability Evaluation and Mechanism of Asphalts Modified With Various Rubber Powder Contents

Stability Evaluation and Mechanism of Asphalts Modified With Various Rubber Powder Contents

Rheological Properties and Antiaging Performance of Graphene Oxide-Modified Bio-Asphalt

The migration and degradation of N‐(1,3‐dimethylbutyl)‐N′‐phenyl‐p‐phenylenediamine from rubber hoses in milk lines

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