Assessment of bonding behavior of hybrid fiber alkali-activated concrete for tunnel lining concrete restoration

IF 9.7 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Journal of Cleaner Production Pub Date : 2025-05-23 DOI:10.1016/j.jclepro.2025.145803

Zhen Gao , Peng Zhang , Xiaobing Dai , Yuanxun Zheng , Hu Feng

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引用次数: 0

Abstract

With the rapid development of the national economy, the tunnel engineering has entered a new stage of construction and maintenance, and the tunnel has ushered in a critical period of reinforcement and restoration. As a new type of green repair material for tunnel lining concrete, hybrid fiber reinforced alkali-activated concrete (HFAAC) can better exert the reinforcing and modifying effects of fibers on repair materials compared with the single fiber reinforced alkali-activated concrete. This study explored the bonding behavior of the interface between HFAAC and cement-based tunnel lining concrete (TLC) through the high-speed camera and acoustic emission (AE) technologies. The experimental design included variables such as interface roughness (I: untreated surface, R_aI = 0 mm; II: surface of the steel brush bristles, R_aII = 0.45 mm; III: deeply roughened surface, R_aIII = 2.21 mm; and IV: natural splitting surface, R_aIV = 8.10 m) and volume fractions of PVA fiber in HFAAC (0 %, 0.3 %, 0.6 %, 0.9 %, and 1.2 %). The loading rate was set at 0.1 mm/min, and the shear specimens were cured for 28 days. Further, a shear bonding mechanical model of the interface between HFAAC and TLC was established. Based on 3D scanning system and fractal theory, the three-dimensional morphological parameters of the bonding interface and the relationship between the fractal dimension and the interface roughness were evaluated. The test results display that the shear bonding strength between HFAAC and TLC ranges from 2.22 to 3.46 MPa, and the interface roughness has the most significant effect on the bonding performance. The shear bonding mechanical model is in good agreement with the experimental values (all within

\pm 10 %

). Furthermore, the interface roughness is closely related to fractal dimension. When the roughness is not more than 2.21 mm, increasing the interface roughness can effectively improve the interfacial bonding performance between HFAAC and TLC, and it can provide certain engineering guidance for the application of tunnel lining structures.

查看原文本刊更多论文

混合纤维碱活化混凝土在隧道衬砌混凝土修复中的粘结性能评价

随着国民经济的快速发展，隧道工程进入了建设维护的新阶段，隧道也迎来了加固修复的关键时期。混合纤维增强碱活化混凝土（HFAAC）作为一种新型的隧道衬砌混凝土绿色修复材料，与单一纤维增强碱活化混凝土相比，能更好地发挥纤维对修复材料的增强和改性作用。本研究通过高速摄像和声发射（AE）技术研究了HFAAC与水泥基隧道衬砌混凝土（TLC）界面的粘结行为。实验设计包括界面粗糙度(I：未处理表面，RaI=0 mm；II：钢刷刚毛表面，RaII =0.45 mm；III：深度粗化表面，RaIII =2.21 mm；IV：自然劈裂面，RaIV =8.10 m)和PVA纤维在HFAAC中的体积分数（0%、0.3%、0.6%、0.9%、1.2%）。加载速率设定为0.1 mm/min，剪切试件固化28 d。建立了HFAAC与TLC界面的剪切粘接力学模型。基于三维扫描系统和分形理论，评估了结合界面的三维形态参数以及分形维数与界面粗糙度的关系。试验结果表明：HFAAC与TLC的剪切结合强度在2.22 ~ 3.46 MPa之间，界面粗糙度对结合性能的影响最为显著。剪切黏结力学模型与试验值吻合较好（均在内）。界面粗糙度与分形维数密切相关。当粗糙度不大于2.21 mm时，增加界面粗糙度可有效改善HFAAC与TLC之间的界面粘结性能，可为隧道衬砌结构的应用提供一定的工程指导。

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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来源期刊

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.