Scholarlink

<p>Design of reclaimed asphalt pavement mixes requires information on the reclaimed asphalt pavement (RAP) aggregate gradation, the binder content and its specification-compliant properties to design a mix accordingly. Among these parameters, estimation of the binder content that can be mobilized from RAP is not straightforward. Here, the quantity of binder mobilized is not proportional to the binder content of RAP aggregates. A possible reason is proposed based on a new concept in which the degree of binder mobilization is considered to depend on the relative surface areas of the binder giving and binder receiving fractions. To illustrate this, a new approach has been formulated in which the sizes of RAP and fresh aggregates are alternated in a gradation band ranging from 19 to 2.36 mm. The RAP and fresh aggregates are blended at conventional mixing conditions and the binder transfer is quantified. To compare the new approach, two other gradations involving (i) large sized-RAP (19–4.75 mm) and small sized-fresh aggregate (4.75–2.36 mm), (ii) small sized-RAP (4.75–2.36 mm) and large sized-fresh aggregate (19–4.75 mm) were considered. Laboratory-simulated RAP was utilized for this purpose. The binder mobilization is higher for the mix with alternate sizes of RAP and fresh aggregates (85.3%) as relative surface areas of the binder giving (RAP fractions) and binder receiving (fresh aggregate) fractions are closer when compared to the other two mixes (53% and 33%). The same was validated for a field RAP.</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

Influence of aggregate surface area on binder mobilization from reclaimed asphalt pavement aggregates

  • 期刊论文

  • 发表日期：

    2026年2月9日

查看全文
  • R Naveen kumar,
  • M R Nivitha,
  • J Murali Krishnan

摘要

Design of reclaimed asphalt pavement mixes requires information on the reclaimed asphalt pavement (RAP) aggregate gradation, the binder content and its specification-compliant properties to design a mix accordingly. Among these parameters, estimation of the binder content that can be mobilized from RAP is not straightforward. Here, the quantity of binder mobilized is not proportional to the binder content of RAP aggregates. A possible reason is proposed based on a new concept in which the degree of binder mobilization is considered to depend on the relative surface areas of the binder giving and binder receiving fractions. To illustrate this, a new approach has been formulated in which the sizes of RAP and fresh aggregates are alternated in a gradation band ranging from 19 to 2.36 mm. The RAP and fresh aggregates are blended at conventional mixing conditions and the binder transfer is quantified. To compare the new approach, two other gradations involving (i) large sized-RAP (19–4.75 mm) and small sized-fresh aggregate (4.75–2.36 mm), (ii) small sized-RAP (4.75–2.36 mm) and large sized-fresh aggregate (19–4.75 mm) were considered. Laboratory-simulated RAP was utilized for this purpose. The binder mobilization is higher for the mix with alternate sizes of RAP and fresh aggregates (85.3%) as relative surface areas of the binder giving (RAP fractions) and binder receiving (fresh aggregate) fractions are closer when compared to the other two mixes (53% and 33%). The same was validated for a field RAP.