Scholarlink

<p>Polymer-modified reclaimed asphalt pavement (PM-RAP) is increasingly available for recycling, but the complex ageing and degradation of styrene-butadiene-styrene (SBS)-modified binders hinder its effective reuse in surface layers. This paper aims to understand the chemo-morphological blending behaviour between aged PM-RAP binders and fresh polymer-modified bitumen (PMB) at recycling ratios of 30% and 60%. Three PMBs from different geographical locations were combined with PM-RAP binders originating from the same respective regions. In total, three PMBs and three corresponding PM-RAP sources were used. Chemical characterisation was performed using Fourier-Transform Infrared (FTIR) spectroscopy, SARA fractionation, and FTIR analysis of the individual fractions. Morphological analysis was carried out using fluorescence microscopy. Results show that the addition of PM-RAP binder increases the ageing index and alters SBS-related signals depending on the RAP source. SARA analysis revealed a shift toward higher resin and asphaltene content with increasing PM-RAP content, while FTIR of the fractions indicated that a majority of the SBS remains in the n-heptane-insoluble phase, together with the asphaltenes. Blending occurred primarily through physical mixing, and strong agreement between experimental and calculated blend compositions (<i>R</i><sup>2</sup> &gt; 0.9 relative to the <i>X</i> = <i>Y</i> parity line) suggests potential for predictive recycling. Fluorescence microscopy confirmed morphological changes reflected by a reduction in fluorescence intensity and polymer domain size upon increased PM-RAP binder percentages, highlighting limitations of chemical analysis alone. These findings provide new insights into the interaction mechanisms between aged and virgin SBS-modified binders and act as a foundation for more targeted recycling strategies.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Chemo-morphological evaluation of the blending behaviour of PMB and polymer-modified RAP binder

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年7月20日

查看全文
  • Isabeau Kokken,
  • Bowen Li,
  • Antonio Roberto,
  • Johannes Mirwald,
  • Wim Van den Bergh,
  • Bernhard Hofko

摘要

Polymer-modified reclaimed asphalt pavement (PM-RAP) is increasingly available for recycling, but the complex ageing and degradation of styrene-butadiene-styrene (SBS)-modified binders hinder its effective reuse in surface layers. This paper aims to understand the chemo-morphological blending behaviour between aged PM-RAP binders and fresh polymer-modified bitumen (PMB) at recycling ratios of 30% and 60%. Three PMBs from different geographical locations were combined with PM-RAP binders originating from the same respective regions. In total, three PMBs and three corresponding PM-RAP sources were used. Chemical characterisation was performed using Fourier-Transform Infrared (FTIR) spectroscopy, SARA fractionation, and FTIR analysis of the individual fractions. Morphological analysis was carried out using fluorescence microscopy. Results show that the addition of PM-RAP binder increases the ageing index and alters SBS-related signals depending on the RAP source. SARA analysis revealed a shift toward higher resin and asphaltene content with increasing PM-RAP content, while FTIR of the fractions indicated that a majority of the SBS remains in the n-heptane-insoluble phase, together with the asphaltenes. Blending occurred primarily through physical mixing, and strong agreement between experimental and calculated blend compositions (R2 > 0.9 relative to the X = Y parity line) suggests potential for predictive recycling. Fluorescence microscopy confirmed morphological changes reflected by a reduction in fluorescence intensity and polymer domain size upon increased PM-RAP binder percentages, highlighting limitations of chemical analysis alone. These findings provide new insights into the interaction mechanisms between aged and virgin SBS-modified binders and act as a foundation for more targeted recycling strategies.