一种多方面的以目标为导向的方法来评估再生再生青混合物的材料循环度指数
Masood Gholami1, Ali Khodaii2, Pouria Hajikarimi1
1Department of Civil and Environmental Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran.
Scientific reports
|April 10, 2025
概括
材料循环性指数 (MCI) 有助于选择可持续的青混合物. 总体而言,50%的再生青路面 (RAP) 混合物表现最好,而65%的RAP在成本和环境方面是最佳的.
科学领域:
- 土木工程 土木工程是指土木工程.
- 材料科学 材料科学 材料科学
- 环境科学 环境科学
背景情况:
- 在新的青混合物中利用再生青路面 (RAP) 对可持续性至关重要.
- 恢复老年RAP是提高其性能和循环性的关键.
- 材料循环性指数 (MCI) 为评估可持续材料选择提供了一个框架.
研究的目的:
- 评估机械性能,测试方法和环境/经济因素对再生青混合物的MCI的影响.
- 引入一个新的MCI定义,将成本,二氧化碳排放和机械性能整合起来.
- 为各种条件确定最佳的再生青混合物成分.
主要方法:
- 使用弹性模量,湿度易感性,间接拉力疲劳,半圆形曲和动态爬行测试,对四种青混合物 (新,35%,50%,65% RAP) 的评估.
- 开发一个新的MCI,包括成本,二氧化碳排放和机械性能.
- 在不同的环境和经济场景中分析MCI表现.
主要成果:
- 50%的RAP混合物在各种场景中表现出卓越的性能,特别是在不同的气候和考虑多个标准时 (MCI:0.380.83).
- 65%的RAP混合物被证明是优先考虑成本和环境效益的最佳方案,特别是在中度至低温下.
- 测试程序的选择,特别是动态爬行测试,显著影响了MCI的结果.
结论:
- 该MCI作为一个多功能指数,用于根据可持续性和性能选择适当的青混合物.
- 整合区域条件,性能需求和环境因素使得可持续的,基于性能的青混合物选择成为可能.
- 优化RAP内容和测试方法对于最大限度地提高青混合物的循环性和性能至关重要.
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