Prof. Mao-hua Zhang Profile

Prof. Mao-hua Zhang

at Harbin Institute of Technology

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Proceedings Article | 5 March 2007 Paper

PZT active health monitoring for fatigue accumulative damage of concrete beam containing nano-particles for pavement

Mao-hua Zhang, Hui Li, Jin-ping Ou

Proceedings Volume 6595, 65952B (2007) https://doi.org/10.1117/12.726464

KEYWORDS: Ferroelectric materials, Wavelets, Signal attenuation, Failure analysis, Wavelet packet decomposition, Sensors, Actuators, Signal analyzers, Cements, Signal processing

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Based on the actuation and sense function of piezoceramic materials, PZT active health monitoring for fatigue accumulative damage of concrete beam containing nano-particles (TiO₂) for pavement is experimentally studied. The test results indicate that the vibration signals received by PZT patches have three development stages obviously: the damage-formation stage, the damage-steady-growth stage and the damage-sharp-growth stage, which shows that PZT patch can monitor the whole course of the formation and growth of cracks in concrete and the failure of concrete beam. The fatigue damage index of concrete based on wavelet packet decomposition is established, and its change trend is similar to that of fatigue damage of concrete. In the range of 0%-10% of fatigue life, the damage index is approximately zero, which means that the concrete beam is basically in a healthy state and internal cracks are germinating. In the range of 10%-90% of fatigue life, the damage index increases from zero to a smaller value slowly, which means that the cracks in concrete propagate slowly. After the 90% of fatigue life, the damage index increases rapidly, which means that the cracks in concrete extend sharply and run through up to the fracture failure of concrete beam. The magnitude of damage index can show the serious extent of fatigue damage in concrete and the healthy status of concrete. The fatigue damage in concrete can be located by comparing the amplitude character of break signals or the change regularity of damage indices of PZT patches attached on concrete beam in different position. Moreover, the smaller the distance of PZT patch from the damage is, the more obvious the signal break and the change of damage index of PZT patch are, and the more sensitive the identification of PZT patch to the damage is.

Proceedings Article | 4 April 2006 Paper

The resistance to chloride penetration of concrete containing nano-particles for pavement

Mao-hua Zhang, Hui Li

Proceedings Volume 6175, 61750E (2006) https://doi.org/10.1117/12.660882

KEYWORDS: Resistance, Cements, Diffusion, Crystals, Lithium, Civil engineering, Minerals, Iron, Nanoparticles, Liquids

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The resistance to chloride penetration of concrete containing nano-particles (TiO₂ and SiO₂) for pavement is experimentally investigated and compared with that of plain concrete, the concrete containing polypropylene (PP) fibers and the concrete containing both nano-particles and PP fibers. The test results indicate that the addition of nano-particles (TiO₂ and SiO₂) improves the resistance to chloride penetration of concrete. The effectiveness of nano-TiO₂ in improving the resistance to chloride penetration reduces with increasing content of nano-TiO₂, and the similar results can be found for the concrete containing nano-SiO₂. The resistance to chloride penetration of concrete containing nano-TiO₂ is better than that containing the same amount of nano-SiO₂. However, the resistance to chloride penetration of concrete containing PP fibers is decreased. The larger the content of PP fibers is, the lower the resistance to chloride penetration of concrete is. For the concrete containing both nano-particles and PP fibers, the resistance to chloride penetration is also reduced and even lower than the concrete only containing the same amount of PP fibers. The relationship between the chloride diffusion coefficient and compressive strength of concrete approaches hyperbola basically, which shows that the resistance to chloride penetration of concrete enhances with increasing compressive strength and proves that compressive strength is an important factor influencing the resistance to chloride penetration of concrete.

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