Stability improvement technology of SBS/crumb rubber composite modified asphalt from Xinjiang China

Wang, Chaohui; Duan, Kaixi; Song, Liang; Ji, Xiaoping; Shu, Cheng

doi:10.1016/j.jclepro.2022.132003

Journal of Cleaner Production

2022

DOI: 10.1016/j.jclepro.2022.132003

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Stability improvement technology of SBS/crumb rubber composite modified asphalt from Xinjiang China

Chaohui Wang

Kaixi Duan

Liang Song³

et al.

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2024

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Cited by 9 publications

(1 citation statement)

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“…Xinjiang, endowed with abundant oil and gas resources, features Karamay asphalt (KLMY) and Tahe asphalt (TH) as its most representative petroleum products. KLMY known for its high production and convenient transportation, has been extensively utilized in road construction throughout Xinjiang (Wang et al, 2022). The chemical composition of KLMY notably differed from the commonly used road petroleum asphalt in China, exhibiting characteristics such as minimal wax content, elevated resins content, and extremely low asphaltene content (Gao et al, 2022).…”

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Comparative study of typical asphalt binders in Xinjiang region modified with warm mix additives

Hu,

Ai,

Feng

2024

Front. Mater.

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Xinjiang’s representative asphalt binders, such as Karamay and Tahe asphalt, lack sufficient research on warm-mix additive modification effects. Given their unique microstructure and molecular composition differences, comprehensive investigations are essential for a nuanced understanding of these binders. This study added Sasobit and Evotherm warm mix additives to Karamay 90# asphalt and Tahe 90# asphalt, respectively. The evaluation of diverse warm mix additives’ impact on diverse asphalt binders involved viscosity, softening point, penetration tests, Fourier transform infrared (FTIR) and analysis of saturate, aromatic, resin, and asphaltene (SARA) fractions. Additionally, molecular models of asphalt were constructed using Materials Studio software, based on the SARA test data. Molecular models of Sasobit and Evotherm were also developed, representing organic wax and a cationic quaternary ammonium surfactant, respectively. Conducting molecular dynamics simulations of warm mix additives and two asphalt molecules yielded valuable insights into solubility parameters and the radial distribution function (RDF). This approach enabled a thorough and comparative exploration of the modification mechanisms employed by various warm mix additives on different asphalt types at a molecular scale. The results indicate that, Evotherm excelled in enhancing high-temperature asphalt performance, while Sasobit surpassed it in low-temperature. The viscosity reduction by Sasobit proved more effective for K90, while for T90 asphalt, the trend was reversed with Evotherm exhibiting superior performance. The solubility parameter in MD simulations consistently correlates with asphalt viscosity results. Sasobit showed enhanced compatibility with K90 asphalt, while T90 asphalt demonstrated greater suitability for modification with Evotherm.

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confidence: 99%

Comparative study of typical asphalt binders in Xinjiang region modified with warm mix additives

Hu,

Ai,

Feng

2024

Front. Mater.

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Reducing the moisture susceptibility of recycled hot‐mix asphalt mixture with composite modification technology

Xiong,

Zeng,

Yao

et al. 2024

Polymer International

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Styrene–butadiene–styrene block copolymer (SBS)‐modified asphalt is a key material for constructing recycled hot‐mix asphalt mixtures (RHMAs). However, these mixtures still risk insufficient moisture stability. To this end, this study investigates the feasibility of asphalt composite modification technology to enhance RHMA performance. SBS, high‐viscosity agent (HVA) and crumb‐rubber materials (CRM) were used to prepare SBS‐HVA‐ and SBS‐CRM‐modified asphalt, with SBS‐modified asphalt as the control group, and the adhesion properties of the asphalt were evaluated using surface free energy tests. RHMAs with 50% reclaimed asphalt pavement were then prepared with each type of modified asphalt. The moisture susceptibility of these mixtures was analyzed using moisture‐induced sensitivity, freeze–thaw splitting and immersion Marshall tests. It was found that HVA significantly enhanced the adhesion of SBS‐modified asphalt under dry conditions, while CRM had a minimal effect. Compared to RHMA with SBS‐modified asphalt, HVA and CRM additives are crucial for enhancing the moisture stability of RHMA in the immersion Marshall test. However, CRM does not improve the moisture stability of RHMA in the moisture‐induced sensitivity and freezing–thaw splitting tests. From the conducted study, it can be proposed that SBS and HVA composite‐modified asphalt can be utilized in RHMAs to achieve higher moisture stability. © 2024 Society of Chemical Industry.

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Road performance, VOCs emission and economic benefit evaluation of asphalt mixture by incorporating steel slag and SBS/CR composite modified asphalt

Zhao

Wang

et al. 2023

Case Studies in Construction Materials

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Stability improvement technology of SBS/crumb rubber composite modified asphalt from Xinjiang China

Cited by 9 publications

References 19 publications

Comparative study of typical asphalt binders in Xinjiang region modified with warm mix additives

Comparative study of typical asphalt binders in Xinjiang region modified with warm mix additives

Reducing the moisture susceptibility of recycled hot‐mix asphalt mixture with composite modification technology

Road performance, VOCs emission and economic benefit evaluation of asphalt mixture by incorporating steel slag and SBS/CR composite modified asphalt

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