Monitoring damage of concrete beams via self-sensing cement mortar coating with carbon nanotube-nano carbon black composite fillers

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS
Liangsheng Qiu, Linwei Li, Ashraf Ashour, Siqi Ding, Baoguo Han
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Abstract

Self-sensing concrete used in coating form for structural health monitoring of concrete structures has the merits of cost-effectiveness, offering protective effect on structural components, enabling electrical measurements unaffected by steel reinforcement and is also convenient to maintain and replace. This paper investigates the feasibility of using self-sensing cement mortar coating containing carbon nanotube-nano carbon black (CNT-NCB) composite fillers (CNCFs) for damage monitoring of concrete beams. The self-sensing cement mortar coated to concrete beams demonstrated outstanding electrical conductivity (resistivity ranging from 18 to 85 Ω·cm). Under monotonic flexural loadings, self-sensing cement mortar coating with 1.8 vol.% CNCFs featured sensitive self-sensing performance in terms of capturing the initiation of vertical cracks at pure bending span of concrete beams, with fractional change in resistivity (FCR) reaching up to 60.6%. Moreover, FCR variations of self-sensing cement mortar coating exhibited good synchronization and stability with the variation of mid-span deflections of concrete beams during cyclic flexural loadings irrespective of the contents of CNCFs and cyclic amplitudes. Remarkably, it was found that FCR of cement mortar coating basically showed a progressive upward tendency, representing irreversible increase in the resistance during cyclic loading. The irreversible residual FCR indicated the crack occurrence and damage accumulation of concrete beams.
通过碳纳米管-纳米炭黑复合填料自感应水泥砂浆涂层监测混凝土梁的损坏情况
以涂层形式用于混凝土结构健康监测的自感应混凝土具有成本效益高、对结构部件具有保护作用、可进行不受钢筋影响的电气测量以及便于维护和更换等优点。本文研究了使用含有碳纳米管-纳米炭黑(CNT-NCB)复合填料(CNCFs)的自感应水泥砂浆涂层对混凝土梁进行损伤监测的可行性。涂覆在混凝土梁上的自感应水泥砂浆具有出色的导电性(电阻率范围为 18 至 85 Ω-cm)。在单调挠曲荷载作用下,涂有 1.8 Vol.% CNCFs 的自感应水泥砂浆具有灵敏的自感应性能,能捕捉到混凝土梁纯弯曲跨度上垂直裂缝的产生,电阻率变化分数(FCR)高达 60.6%。此外,无论 CNCF 的含量和循环振幅如何,自感应水泥砂浆涂层的 FCR 变化与循环弯曲荷载作用下混凝土梁的中跨挠度变化具有良好的同步性和稳定性。值得注意的是,研究发现水泥砂浆涂层的 FCR 基本上呈现逐渐上升的趋势,代表循环荷载期间阻力的不可逆增加。不可逆的残余 FCR 表明了混凝土梁的裂缝发生和损伤累积。
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来源期刊
ACS Applied Bio Materials
ACS Applied Bio Materials Chemistry-Chemistry (all)
CiteScore
9.40
自引率
2.10%
发文量
464
期刊介绍: ACS Applied Bio Materials is an interdisciplinary journal publishing original research covering all aspects of biomaterials and biointerfaces including and beyond the traditional biosensing, biomedical and therapeutic applications. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrates knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important bio applications. The journal is specifically interested in work that addresses the relationship between structure and function and assesses the stability and degradation of materials under relevant environmental and biological conditions.
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