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<p>A functional modification strategy using vermiculite powder has attracted significant attention in asphalt composites due to its tunable interlayer structure and surface modifiability. However, the evolution law of the phase structure of vermiculite powder induced by functionalization treatment and its synergistic regulation mechanism on the multi-scale properties of the crumb rubber (CR) asphalt system have not yet been clarified. Therefore, in this investigation, vermiculite powder was chemically modified through organic intercalation followed by thermal expansion. The resulting organo-expanded vermiculite (OEV) was subsequently incorporated into CR asphalt with furfural-extracted oil (OIL) as an additive. The chemical and microstructural evolution of vermiculite during modification was investigated, and the optimal formulation was determined using response surface methodology and the NAGA-II multi-objective optimization algorithm. Rheological behavior of the modified asphalt at high and low temperatures was assessed, along with the stability of the compound modifier within the asphalt matrix. Additionally, Road performance and noise reduction effects of the asphalt mixtures were also examined. Results showed that organic intercalation and thermal expansion altered the interlayer anions and cations in vermiculite, forming hydrogen bonds, electrostatic interactions, and hydrophobic forces. These changes increased interlayer spacing, surface area, and pore structure, enhancing OEV’s thermal stability and adaptability. The optimal ratios of CR, OEV and OIL were 20%, 3.3% and 5%, respectively. The rheological test analysis of asphalt shows that OIL improves the low-temperature performance of modified asphalt, OEV improves the high-temperature performance of asphalt, and COO modified asphalt has excellent rheological properties at high and low temperatures. In addition, compared with pure CR modified asphalt mixture, COO modified asphalt mixture has significant advantages in high temperature stability, low temperature crack resistance, water stability and noise attenuation. The Analytic Hierarchy Process (AHP) evaluation confirmed the composite’s potential as a sustainable, high-performance material for road engineering applications.</p>

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Organic expansion vermiculite for synergistic enhancement of CR asphalt: microstructural mechanisms, rheological performance improvement, and noise reduction

  • 期刊论文

  • 发表日期：

    2025年11月27日

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  • Jiao Jin,
  • Mengcheng Xiao,
  • Pei Liu,
  • Shuai Liu,
  • Kunfeng Ma,
  • Hanbo Li,
  • Wutong Peng,
  • Yunli Sun

摘要

A functional modification strategy using vermiculite powder has attracted significant attention in asphalt composites due to its tunable interlayer structure and surface modifiability. However, the evolution law of the phase structure of vermiculite powder induced by functionalization treatment and its synergistic regulation mechanism on the multi-scale properties of the crumb rubber (CR) asphalt system have not yet been clarified. Therefore, in this investigation, vermiculite powder was chemically modified through organic intercalation followed by thermal expansion. The resulting organo-expanded vermiculite (OEV) was subsequently incorporated into CR asphalt with furfural-extracted oil (OIL) as an additive. The chemical and microstructural evolution of vermiculite during modification was investigated, and the optimal formulation was determined using response surface methodology and the NAGA-II multi-objective optimization algorithm. Rheological behavior of the modified asphalt at high and low temperatures was assessed, along with the stability of the compound modifier within the asphalt matrix. Additionally, Road performance and noise reduction effects of the asphalt mixtures were also examined. Results showed that organic intercalation and thermal expansion altered the interlayer anions and cations in vermiculite, forming hydrogen bonds, electrostatic interactions, and hydrophobic forces. These changes increased interlayer spacing, surface area, and pore structure, enhancing OEV’s thermal stability and adaptability. The optimal ratios of CR, OEV and OIL were 20%, 3.3% and 5%, respectively. The rheological test analysis of asphalt shows that OIL improves the low-temperature performance of modified asphalt, OEV improves the high-temperature performance of asphalt, and COO modified asphalt has excellent rheological properties at high and low temperatures. In addition, compared with pure CR modified asphalt mixture, COO modified asphalt mixture has significant advantages in high temperature stability, low temperature crack resistance, water stability and noise attenuation. The Analytic Hierarchy Process (AHP) evaluation confirmed the composite’s potential as a sustainable, high-performance material for road engineering applications.