Self-sensing capability of Engineered Cementitious Composites: Effects of aging and loading conditions
Self-sensing capability of Engineered Cementitious Composites: Effects of aging and loading conditions
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DOI：
10.1016/j.conbuildmat.2019.117132
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发表时间：
2020-01
影响因子：
7.4
通讯作者：
G. Yıldırım;Oğuzhan Öztürk;A. Al-Dahawi;Adem Afşın Ulu;M. Şahmaran
中科院分区：
文献类型：
--
作者：
G. Yıldırım;Oğuzhan Öztürk;A. Al-Dahawi;Adem Afşın Ulu;M. Şahmaran
本文研究了与微米级碳纤维 (CF/ECC-CF) 或多壁碳纳米管 (CNT/ECC-CNT) 和纳米级炭黑 (CB/ECC-CB) 结合的 7 天、28 天、90 天和 180 天的工程水泥复合材料 (ECC) 的自感知能力。评估了不同龄期混合物的机械性能（压缩强度、劈裂拉伸强度/变形、弯曲强度/变形）。还生产并测试了不含任何碳基材料的对照混合物（ECC-Control）以进行比较。根据负载条件，使用直流电 (DC) 或交流电 (AC) 的设备进行自感应评估。结果表明，碳基材料通常会改善 ECC-Control 样本的机械性能，具体取决于碳基材料的类型、样本的年龄和加载条件。除了在单轴压缩和劈裂张力下加载 180 天的 ECC-Control 样本外，所有样本均感测到不同类型的损坏，这是由于阻抗结果突然增加超出了测试设备的极限，这揭示了导电材料的存在对于实现独立于老化、测试配置/设备、负载条件和微裂纹特征的增强自感知能力的重要性。 CF 是提高所有年龄和负载条件下 ECC-Control 样本自感知能力的最佳选择。 ECC-CNT 和 ECC-CB 的自感应性能相当，在需要自感应可逆性的情况下，建议使用纳米级碳基材料。
Self-sensing capability of 7-, 28-, 90- and 180-day-old Engineered Cementitious Composites (ECC) incorporated either with carbon fibers (CF/ECC-CF) at micro-scale or multi-walled carbon nanotubes (CNT/ECC-CNT) and carbon black (CB/ECC-CB) at nano-scale were investigated herein. Mechanical properties (compressive strength, splitting tensile strength/deformation, flexural strength/deformation) of different-age mixtures were evaluated. Control mixture (ECC-Control) without any carbon-based material was also produced and tested for comparison. Depending on the loading condition, equipment utilizing either direct current (DC) or alternating current (AC) was used for self-sensing assessments. Results showed that carbon-based materials generally improve the mechanical properties of ECC-Control specimens depending on the type of carbon-based materials, specimens’ age and loading conditions. All specimens sensed different types of damage except 180-day-old ECC-Control specimens loaded under uniaxial compression and splitting tension due to abrupt increments in impedance results exceeding the limits of testing device which revealed the importance of presence of electrically-conductive materials for achieving enhanced self-sensing capability independent of aging, testing configuration/equipment, loading conditions and microcrack characteristics. CF is the best to improve self-sensing capability of ECC-Control specimens for all ages and loading conditions. Self-sensing performances of ECC-CNT and ECC-CB are comparable and utilization of nano-size carbon-based materials is suggested in cases where reversibility in self-sensing is needed.