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Effect of HPMC on the Piezoresistivity of smart Concrete aggregate with Z Shape

Journal of Wuhan University of Technology(Materials Science) 2020年第4期35卷 768-777页

作者：王海峰 YAN Handong MEI Zhen College of Civil Engineering Huaqiao UniversityXiamen 361021China

Cement mortar with carbon fiber(CFc)and resin-cement mortar with carbon fiber(CFrc)were used as inner and outer cores of smart aggregate with Z shape,respectively,which was used as the basic perception units to prepare smart concrete aggregate with a mosaic structure(SAMS).The hydroxpropyl methylcellulose(HPMC)was taken into consideration to improve the properties of mortar;by using HPMC,the structure of SAMS was optimized and its mechanical and electrical properties were *** experimental results show that the toughness of mortar could be improved by the complex that formed by epoxy resin,and the effect of HPMC on the flexibility of CFc was greater than that on the flexibility of CFrc;the feasible designing indicates that the CFc-Z core and CFrc-Z core could be used as inner and outer cores of *** the proposed dosages of HPMC in inner and outer cores are 0.35wt%and 0.2wt%,respectively,it could give an effective prediction for the damage of concrete during the loading process.

关键词： smart aggregate hydroxpropyl methylcellulose(HPMC) smart concrete piezoresistivity

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Seismic health monitoring of RC frame structures using smart aggregates

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Earthquake Engineering and Engineering Vibration 2013年第1期12卷 25-32页

作者： Wen-I Liao C.H.Lin J.S.Hwang G.Song Department of Civil Engineering Taipei University of Techology (NTUT) Department of Construction Engineering Taiwan University of Science and Technology Department of Mechanical Engineering University of Houston

Structural health monitoring of RC structures under seismic loads has recently attracted much attention in the earthquake engineering research community. In this study, a piezoceramic-based device called ＂smart aggregate＂ was used for the health monitoring of RC frame structures under earthquake excitations. Three RC moment frames instrumented with smart aggregates were tested using a shaketable with different ground excitation intensities. Distributed piezoceramic- based smart aggregates were embedded in the RC structures and used to monitor their health condition during the tests. The sensitivity and effectiveness of the proposed piezoceramic-based approach were investigated and evaluated by analyzing the measured responses. The displacement ductility demand of the structural members was calculated and compared with the damage index determined from the health monitoring system. The comparison shows that the damage index is compatible with the calculated ductility demand.

关键词： smart aggregate health monitoring RC frame shaketable piezoceramic

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Water presence detection in a concrete crack using smart aggregates

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International Journal of smart and Nano Materials 2015年第3期6卷 149-161页

作者： Qingzhao Kong Qian Feng Gangbing Song Department of Mechanical Engineering University of HoustonHoustonTX 77204USA Hubei Key Laboratory of Earthquake Early Warning Institute of SeismologyChina Earthquake AdministrationWuhan 430071China Wuhan Institute of Earthquake Engineering Wuhan 430071China School of Civil Engineering Dalian University of TechnologyDalianLiaoningChina

Liquid migrating into existing concrete cracks is a serious problem for the reliability of concrete structures and can sometimes induce full concrete structural *** this paper,the authors present recent research on water presence detection in concrete cracks using piezoceramic-based smart aggregate(SA)*** active sensing approach,in which one piezoceramic transducer is used to generate stress waves and others are used to detect the stress wave responses,is adopted in this *** formed in concrete structures act as stress reliefs,which attenuate the energy of the signals received by the *** case of a crack being filled with liquid,which changes the wave impedance,the piezoceramic transducers will report higher received energy levels.A wavelet packet-based approach is developed to provide calculated energy values of the received *** different values can help detect the liquid presence in a concrete crack.A concrete beam specimen with three embedded SAs was fabricated and *** results verified that the SA-based active sensing approach can detect a concrete crack and further detect the liquid presence in the concrete crack.

关键词： water detection concrete crack smart aggregate active sensing piezoceramic sensors and actuators2

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