ABSTRACT

The wood ash, generated at a large scale globally, is often landfilled or open dump, which creates a land shortage and environmental issues. Incorporating wood by-products in asphalt materials helped improve the performance and mitigate the stated problems, but little work was conducted to evaluate the effectiveness of incorporating wood ashes at the Nanoscale. Therefore, the aim is to study the effects of different Nano wood ashes on the performance of asphalt binder and mixtures. The mechanically-processed Nano wood ashes were used to produce asphalt binder and mixtures at 1%, 3%, and 5% by weight. Initially, X-ray diffraction was used to study chemical properties and Nano-size of wood ashes. The rheological and mechanical properties of modified binders and mixtures were assessed through physical tests, performance grading, frequency sweep, wheel tracker, dynamic modulus, four-point beam fatigue, bitumen bond strength, and rolling bottle tests. The results showed a significant improvement in rutting and moisture resistance and an insignificant effect on fatigue resistance of modified materials with increased concentration of all Nano-wood ashes. Overall, the results illustrated that incorporating nano-wood ash in asphalt materials can be regarded as an effective alternative for pavement applications that could minimise waste material disposal.

摘要

全球大规模产生的木灰通常被填埋或露天堆放，造成土地短缺和环境问题。在沥青材料中加入木材副产品有助于提高性能并缓解上述问题，但几乎没有开展工作来评估在纳米尺度上加入木灰的有效性。因此，目的是研究不同纳米木灰对沥青结合料和混合料性能的影响。机械加工的纳米木灰用于生产 1%、3% 和 5% 重量的沥青粘合剂和混合物。最初，X 射线衍射用于研究木灰的化学性质和纳米尺寸。通过物理测试、性能分级、频率扫描、车轮跟踪仪、动态模量、四点梁疲劳、沥青粘合强度和滚动瓶测试。结果表明，随着所有纳米木灰浓度的增加，改性材料的车辙和防潮性能显着提高，而对改性材料的抗疲劳性能影响不大。总体而言，结果表明，在沥青材料中加入纳米木灰可被视为路面应用的有效替代方案，可最大限度地减少废物处理。