Study on road, mechanical, interface performance, and sustainability of semi-flexible pavement using geopolymer as grouting material

IF 9.7 1区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL Journal of Cleaner Production Pub Date : 2024-12-16 DOI:10.1016/j.jclepro.2024.144498
Ye Wang, Ai-Hong Kang, Yao Zhang, Yong-Fan Gong, Hao-Chen Wu, Yi-Miao Lu
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Abstract

Geopolymers utilize industrial waste as raw materials, offering benefits such as environmental sustainability, rapid strength development, accelerated hardening and high-temperature resistance. They serve as an effective alternative to Ordinary Portland Cement (OPC) for semi-flexible pavement (SFP) grouting applications. This study first involved the mix design of open-graded asphalt (OGA) mixtures and geopolymers, including the original geopolymer (OG) and modified geopolymer (MG). Furthermore, the SFP mixtures infused with two types of geopolymers were cured, and the road and mechanical performance were evaluated at the specified time intervals (7 days, 14 days, and 28 days). Finally, the failure mode of SFP mixtures and the adhesion characteristics of OG and MG with asphalt were examined comprehensively by macroscopic test (low-temperature bending beam test), mesoscopic test (pull-out test), and microscopic tests (contact angle and infrared spectroscopy tests). The results indicate that, in comparison to OG, the SFP mixtures utilizing MG as the grouting agent exhibit superior performance at each stage of the curing cycle. The geopolymer-asphalt interface remains the vulnerable junction in SFP mixtures. MG shows improved bonding strength with asphalt throughout a range of curing ages and greater adsorption ability with asphalt. During the entire life cycle (LC), SFP-MG can reduce the number of maintenance times, resulting in high sustainability.

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土工聚合物利用工业废料作为原材料,具有环境可持续性、快速强度发展、加速硬化和耐高温等优点。在半柔性路面(SFP)灌浆应用中,它们是普通硅酸盐水泥(OPC)的有效替代品。这项研究首先涉及开放级配沥青(OGA)混合料和土工聚合物(包括原始土工聚合物(OG)和改性土工聚合物(MG))的混合料设计。此外,还对注入两种土工聚合物的 SFP 混合料进行了固化,并在规定的时间间隔(7 天、14 天和 28 天)内对路面和机械性能进行了评估。最后,通过宏观试验(低温弯梁试验)、中观试验(拉拔试验)和微观试验(接触角和红外光谱试验),全面考察了 SFP 混合料的失效模式以及 OG 和 MG 与沥青的粘附特性。结果表明,与 OG 相比,使用 MG 作为灌浆剂的 SFP 混合物在固化周期的每个阶段都表现出更优越的性能。在 SFP 混合物中,土工聚合物-沥青界面仍然是最脆弱的连接点。在不同的固化龄期,MG 与沥青的粘结强度都有所提高,与沥青的吸附能力也更强。在整个生命周期(LC)内,SFP-MG 可减少维护次数,从而实现高度的可持续性。
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来源期刊
Journal of Cleaner Production
Journal of Cleaner Production 环境科学-工程:环境
CiteScore
20.40
自引率
9.00%
发文量
4720
审稿时长
111 days
期刊介绍: The Journal of Cleaner Production is an international, transdisciplinary journal that addresses and discusses theoretical and practical Cleaner Production, Environmental, and Sustainability issues. It aims to help societies become more sustainable by focusing on the concept of 'Cleaner Production', which aims at preventing waste production and increasing efficiencies in energy, water, resources, and human capital use. The journal serves as a platform for corporations, governments, education institutions, regions, and societies to engage in discussions and research related to Cleaner Production, environmental, and sustainability practices.
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