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应用于钢筋混凝土（RC）结构构件的多功能水泥基复合材料应变与损伤传感器

Multifunctional Cement Composites Strain and Damage Sensors Applied on Reinforced Concrete (RC) Structural Elements.

作者信息

Baeza Francisco Javier, Galao Oscar, Zornoza Emilio, Garcés Pedro

机构信息

Civil Engineering Department, Universidad de Alicante, Ctra. San Vicente s/n, San Vicente del Raspeig 03690, Spain.

出版信息

Materials (Basel). 2013 Mar 6;6(3):841-855. doi: 10.3390/ma6030841.

DOI:10.3390/ma6030841
PMID:28809343
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5512802/
Abstract

In this research, strain-sensing and damage-sensing functional properties of cement composites have been studied on a conventional reinforced concrete (RC) beam. Carbon nanofiber (CNFCC) and fiber (CFCC) cement composites were used as sensors on a 4 m long RC beam. Different casting conditions ( or attached), service location (under tension or compression) and electrical contacts (embedded or superficial) were compared. Both CNFCC and CFCC were suitable as strain sensors in reversible (elastic) sensing condition testing. CNFCC showed higher sensitivities (gage factor up to 191.8), while CFCC only reached gage factors values of 178.9 (tension) or 49.5 (compression). Furthermore, damage-sensing tests were run, increasing the applied load progressively up to the RC beam failure. In these conditions, CNFCC sensors were also strain sensitive, but no damage sensing mechanism was detected for the strain levels achieved during the tests. Hence, these cement composites could act as strain sensors, even for severe damaged structures near to their collapse.

摘要

在本研究中，对常规钢筋混凝土（RC）梁上水泥基复合材料的应变传感和损伤传感功能特性进行了研究。碳纳米纤维水泥基复合材料（CNFCC）和纤维水泥基复合材料（CFCC）被用作一根4米长的RC梁上的传感器。比较了不同的浇筑条件（或附着方式）、使用位置（受拉或受压）和电接触方式（嵌入式或表面式）。在可逆（弹性）传感条件测试中，CNFCC和CFCC都适合作为应变传感器。CNFCC表现出更高的灵敏度（应变片系数高达191.8），而CFCC的应变片系数仅达到178.9（受拉）或49.5（受压）。此外，进行了损伤传感测试，逐步增加施加的荷载直至RC梁破坏。在这些条件下，CNFCC传感器也对应变敏感，但在测试过程中达到的应变水平下未检测到损伤传感机制。因此，这些水泥基复合材料即使对于接近坍塌的严重受损结构也能充当应变传感器。

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