保护层材料对智能骨料性能影响的试验研究
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摘要
研究了不同保护层材料(大理石、水泥砂浆、环氧树脂)在智能骨料制作过程中对电阻、电容性能的影响,以及对由不同保护层材料的智能骨料构成的智能监测系统的性能进行了对比,考察了信号幅值和线性灵敏度两个指标。结果表明,大理石保护层和环氧树脂保护层对智能骨料中压电陶瓷片(PZT)的电阻值无影响,而水泥砂浆保护层对PZT片的电阻值影响较明显,在水泥砂浆潮湿的情况下电阻值较小,干燥情况下电阻值较大;保护层材料对智能骨料的电容值影响较大,其中水泥砂浆保护层导致PZT片的电容值变化量约为18%~27%,大理石保护层导致PZT片的电容值变化量约为18%~22%,环氧树脂保护层导致PZT片的电容值变化量约为17%~20%。由大理石保护层智能骨料构成的智能监测系统其信号幅值和灵敏度最高,其次是水泥砂浆,最后是环氧树脂。根据试验结果大理石比较适合用作智能骨料的保护层材料。
In this paper,the influences of different protective layer materials(marble,cement mortar,epoxy resin)on the performance of the resistance and capacitance during the fabrication process of the smart aggregate has been studied,the performances of the smart monitoring system composed of smart aggregates with different protective layer materials have been compared,and two indexes of signal amplitude and linear sensitivity are investigated.The test results show that the marble protective layer and epoxy resin protective layer has no effect on the resistance value of smart aggregate,while the protective layer of cement mortar has a significant influence on the resistance value of the PZT sheet,the resistance value of the cement mortar is small when the cement mortar is wet,and the resistance value is large when the mortar is dry.The protective layer material has a great influence on the capacitance value of smart aggregate,in which the cement mortar protective layer has the greatest influence on the capacitance,the amount of variation is between 18%~27%,followed by marble,between 18%~22%,the epoxy resin protective layer has the least influence on the capacitance,between 17% ~20%.In the smart monitoring system composed of smart aggregate which are made of different protective layer materials,the signal amplitude and sensitivity of the smart aggregate with marble protective layer are the highest,the second is cement mortar,and the last is epoxy resin.It is concluded that the marble is the most suitable material for the protective layer of smart aggregate.
In this paper,the influences of different protective layer materials(marble,cement mortar,epoxy resin)on the performance of the resistance and capacitance during the fabrication process of the smart aggregate has been studied,the performances of the smart monitoring system composed of smart aggregates with different protective layer materials have been compared,and two indexes of signal amplitude and linear sensitivity are investigated.The test results show that the marble protective layer and epoxy resin protective layer has no effect on the resistance value of smart aggregate,while the protective layer of cement mortar has a significant influence on the resistance value of the PZT sheet,the resistance value of the cement mortar is small when the cement mortar is wet,and the resistance value is large when the mortar is dry.The protective layer material has a great influence on the capacitance value of smart aggregate,in which the cement mortar protective layer has the greatest influence on the capacitance,the amount of variation is between 18%~27%,followed by marble,between 18%~22%,the epoxy resin protective layer has the least influence on the capacitance,between 17% ~20%.In the smart monitoring system composed of smart aggregate which are made of different protective layer materials,the signal amplitude and sensitivity of the smart aggregate with marble protective layer are the highest,the second is cement mortar,and the last is epoxy resin.It is concluded that the marble is the most suitable material for the protective layer of smart aggregate.
引文
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[2]梁丽娉.压电陶瓷传感器力学模型理论与试验研究[D].沈阳:沈阳建筑大学,2011.
[3]吴建新.基于虚拟仪器技术的压电混凝土结构健康监测系统开发[D].沈阳:沈阳建筑大学,2013.
[4]GU H,MOSLEHY Y,SANDERS D,et al.Multifunctional smart aggregate-based structural health monitoring of circular reinforced concrete columns subjected to seismic excitations[J].Smart Materials&Structures,2010,19(6):065026.
[5]GU H,SONG G,DHONDE H,et al.Concrete earlyage strength monitoring using embedded piezoelectric transducers[J].Smart Material Structures,2006,15(6):1837.
[6]张富尧.基于压电智能骨料的混凝土渗水监测方法研究[D].深圳:哈尔滨工业大学,2014.
[7]张海滨.基于压电智能骨料的钢筋混凝土结构地震应力监测方法[D].大连:大连理工大学,2012.
[8]KONG Q,HOU S,JI Q,et al.Very early age concrete hydration characterization monitoring using piezoceramic based smart aggregates[J].Smart Materials&Structures,2013,22(8):085025.
[9]FENG Q,KONG Q,SONG G.Damage detection of concrete piles subject to typical damage types based on stress wave measurement using embedded smart aggregates transducers[J].Measurement,2016,88:345-352.
[10]孙威,陈佳,阎石,等.基于压电智能骨料的混凝土强度监测方法研究[J].混凝土与水泥制品,2016(2):1-5.
[11]吴方红.基于压电智能骨料的钢管混凝土柱应力监测与损伤诊断[D].荆州:长江大学,2016.
[12]李旭.基于压电陶瓷传感器宽频响应的结构损伤识别[D].大连:大连理工大学,2015.
[13]SARAVANAN T J,BALAMONICA K,PRIYA C B,et al.Comparative performance of various smart aggregates during strength gain and damage states of concrete[J].Smart Materials&Structures,2015,24(8):085016-3.
[14]赵晓燕.基于压电陶瓷的结构健康监测与损伤诊断[D].大连:大连理工大学,2008.
[15]RAGHAVAN A,CESNIK C E S.Finite-dimensional piezoelectric transducer modeling for guided wave based structural health monitoring[J].Smart Materials&Structures,2005,14(6):1448-1461.
[16]OH I,PARK N,SUH K D.Publication and proposed revision of ANSI/IEEE standard 176-1987“ANSI/IEEE standard on piezoelectricity”[J].Ultrasonics Ferroelectrics&Frequency Control IEEE Transactions on,1996,43(5):717.
[17]HOU S,ZHANG H B,OU J P.A PZT-based smart aggregate for compressive seismic stress monitoring[J].Smart Materials&Structures,2012,21(10):5035.