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Promoting resource conservation in road flexible pavement using jet grouting and plastic waste as filler
Resources, Conservation and Recycling ( IF 13.2 ) Pub Date : 2022-09-01 , DOI: 10.1016/j.resconrec.2022.106633
Francesca Russo, Cristina Oreto, Rosa Veropalumbo

The circular economy aims to change the paradigm in relation to the linear economy by limiting the environmental impact and waste of resources, as well as increasing efficiency at all stages of the product economy; the recent warnings about waste pollution and the limits of natural resources are encouraging its development.

The purpose of this research is to investigate the potential environmental and mechanical benefits of reusing two different waste, namely jet grouting waste (JGW) and plastic waste (PW) for producing hot asphalt mastics made up of bitumen and filler: the JGW comes from the soil consolidation activities during pavement construction, while the PW, a mixture of high-density polyethylene, low density polyethylene, polypropylene and polyethylene terephthalate derives from a plastic recycling plant.

First, three mastics engineered by keeping constant viscosity and a filler over bitumen ratio of 0.3 for the asphalt mastic with limestone filler (LM), 0.29 for the mastic with JGW (JGWM) and 0.1 for the solution containing PW (PWM), were investigated through a dynamic shear rheometer to explore their rheological behavior.

Second main step concerned the life cycle assessment (LCA) of the three asphalt mastics that, in turn, are included into the base layer of a flexible road pavement by following ReCiPe impact assessment methodology.

Primary results in terms of mechanical performance demonstrated that: 1) JGWM outperformed LM in terms of complex shear modulus, which resulted 19% higher than that of LM in the temperature range below 30 °C, and 2) PWM returned on average 30% lower non-recoverable creep compliance at 50 °C under 0.1 and 3.2 kPa than remaining solutions under analysis.

LCA outcomes showed, on the one hand, that PWM had the best environmental performance, expressing the lowest damage to human health, ecosystems and resource availability indicators, returning on average 34% and 19% lower indicators than LM and JGWM, respectively. On the other hand, JGWM still represented an overall improvement of the environmental performance compared to LM, returning the best performance in terms of damage to human health, which lowers by 23%, due to the reduction of the output waste stream.



中文翻译:

以喷射灌浆和废塑料为填料促进道路柔性路面的资源节约

循环经济旨在通过限制环境影响和资源浪费以及提高产品经济各个阶段的效率来改变与线性经济相关的范式;最近关于废物污染和自然资源限制的警告正在鼓励其发展。

本研究的目的是研究再利用两种不同的废物,即喷射灌浆废物 (JGW) 和塑料废物 (PW) 用于生产由沥青和填料组成的热沥青胶粘剂的潜在环境和机械效益:JGW 来自路面施工期间的土壤固结活动,而 PW 是高密度聚乙烯、低密度聚乙烯、聚丙烯和聚对苯二甲酸乙二醇酯的混合物,来自塑料回收厂。

首先,研究了三种胶粘剂,通过保持恒定粘度和填料与沥青的比为 0.3 的石灰石填料 (LM)、0.29 的 JGW (JGWM) 胶泥和 0.1 的含 PW (PWM) 的溶液。通过动态剪切流变仪来探索它们的流变行为。

第二个主要步骤涉及三种沥青胶粘剂的生命周期评估(LCA),而这三种沥青胶泥又通过遵循 ReCiPe 影响评估方法被纳入柔性路面的基层。

机械性能方面的初步结果表明:1) JGWM 在复杂剪切模量方面优于 LM,在低于 30 °C 的温度范围内比 LM 高 19%,2) PWM 平均返回低 30%在 0.1 和 3.2 kPa 下,50 °C 下的不可恢复蠕变柔量比分析中的其余溶液低。

LCA 结果表明,一方面,PWM 具有最佳的环境绩效,对人类健康、生态系统和资源可用性指标的损害最低,其返回指标平均分别比 LM 和 JGWM 低 34% 和 19%。另一方面,与 LM 相比,JGWM 仍然代表了环境性能的整体改善,在对人体健康的损害方面恢复了最佳性能,由于减少了输出废物流,降低了 23%。

更新日期:2022-09-01
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