Effect of Recycled Aggregates and Polymer Modified Bitumen on the Marshall Properties of Hot Mix Asphalt- A Case Study

Volume 21, Issue 1 Pub Date : 2023-06-30 DOI:10.52584/qrj.2101.03

Diyar Khan

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Abstract

The main objective of this study was to assess the performance and physical properties of hot mix asphalt mixes incorporating recycled aggregates from demolished concrete and compare them with an unmodified hot mix asphalt mixture. Using recycled aggregates offers potential environmental benefits by reducing the load on landfill sites associated with demolished concrete waste. Hot mix asphalt mixes were prepared using the Marshall mix-design technique, with varying proportions (0%, 25%, 50%, and 75%) of recycled aggregates replacing the coarse virgin aggregates. The resulting mixes were compared to a control sample. It was observed that with an increase in the proportion of recycled aggregates, the stability of the mixes decreased. Additionally, the number of air voids and voids filled by mineral aggregates increased. However, laboratory tests indicated that the recycled aggregates modified mixes exhibited comparable performance to conventional hot mix asphalt mixes while providing improved environmental advantages through the recovery and reuse of waste concrete aggregates. These findings highlight the potential of utilizing recycled aggregates in hot mix asphalt as a sustainable approach in asphalt pavement construction.

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再生骨料和聚合物改性沥青对热拌沥青马歇尔性能的影响——以热拌沥青为例

本研究的主要目的是评估热拌沥青混合料的性能和物理特性，并将其与未改性的热拌沥青混合料进行比较。使用再生骨料可减少与拆卸混凝土废料有关的堆填区负荷，从而带来潜在的环境效益。采用马歇尔混合料设计技术制备热拌沥青混合料，用不同比例(0%、25%、50%和75%)的再生骨料代替粗原骨料。将得到的混合物与对照样品进行比较。结果表明，随着再生骨料比例的增加，混合料的稳定性下降。此外，气孔和矿物团聚体填充的气孔数量增加。然而，实验室测试表明，再生骨料改性混合料表现出与传统热拌沥青混合料相当的性能，同时通过回收和再利用废弃混凝土骨料提供了更好的环境优势。这些发现突出了在热拌沥青中利用再生骨料作为沥青路面建设的可持续方法的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Volume 21, Issue 1

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