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Properties Of Concrete

Advances in Piezoelectric Polymer Composites for Energy Harvesting Applications: A Systematic Review

Wind energy is one of the most important renewable energy sources and many countries are predicted to increase wind energy portion of their whole national energy supply to about twenty percent in the next decade. One potential obstacle in the use of wind turbines to harvest wind energy is the maintenance of the wind turbine blades. The blades are a crucial and costly part of a wind turbine and over their service life can suffer from factors such as material degradation and fatigue, which can limit their effectiveness and safety. Thus, the ability to detect damage in wind turbine blades is of great significance for planning maintenance and continued operation of the wind turbine. This paper presents a review of recent research and development in the field of damage detection for wind turbine blades. Specifically, this paper reviews frequently employed sensors including fiber optic and piezoelectric sensors, and four promising damage detection methods, namely, transmittance function, wave propagation, impedance and vibration based methods. As a note towards the future development trend for wind turbine sensing systems, the necessity for wireless sensing and energy harvesting is briefly presented. Finally, existing problems and promising research efforts for online damage detection of turbine blades are discussed.

https://iopscience.iop.org/article/10.1088/0964-1726/24/3/033001/pdf

A review of damage detection methods for wind turbine blades

The quantitative scanning electron microscope-backscattered electron (SEM-BSE) image analysis was used to evaluate capillary porosity and pore size distributions in high-strength concretes at early ages. The Powers model for the hydration of cement was applied to the interpretation of the results of image analysis. The image analysis revealed that pore size distributions in concretes with an extremely low water/binder ratio of 0.25 at early ages were discontinuous in the range of finer capillary pores. However, silica-fume-containing concretes with a water/binder ratio of 0.25 had larger amounts of fine pores than did concretes without silica fume. The presence of larger amounts of fine capillary pores in the concretes with silica fume may be responsible for greater autogenous shrinkage in the silica-fume-containing concretes at early ages.

Evaluation of capillary pore size characteristics in high-strength concrete at early ages

Rebar corrosion has become a very common cause of degradation in the reinforced concrete structures. It is most frequently the result of the chloride-induced breakdown of the passive film formed in...

Reinforcement corrosion assessment capability of surface bonded and embedded piezo sensors for reinforced concrete structures

The performance (sensing/actuating) of a piezotransducer highly depends upon the ability of the bond layer to transfer the stress and strain (through shear lag mechanism) between the transducer and the structure. Therefore, the coupled electromechanical response of the piezotransducer should consider the effect of dynamic behaviour, geometry and composition of the adhesive layer used to bond the transducer patch on the structure. This article presents a new refined analytical model for inclusion of the shear lag effect in modelling of adhesively bonded piezoelectric ceramic (lead zirconate titanate) patches for consideration in the electromechanical impedance technique. The previous models neglected the inertial term in shear lag formulations for simplicity. The present refined model, on the other hand, considers the inertial and the shear lag effects simultaneously, and is therefore more rigorous and complete. In this article, the formulations are first derived for one-dimensional case, and then extended...

A refined shear lag model for adhesively bonded piezo-impedance transducers:

Piezoelectric Materials: Applications in SHM, Energy Harvesting and Bio-mechanics

A continuum based modelling approach for adhesively bonded piezo-transducers for EMI technique

This article deals with the analysis of the power consumption in the piezoelectric ceramic patch of lead zirconate titanate and the losses arising from the adhesive bonding with the host structure....

Influence of adhesive bond layer on power and energy transduction efficiency of piezo-impedance transducer:

Hydration of concrete is a very complicated and multiphase process, where the cement gel transforms into a hardened state from plastic/semiplastic phase. Proper progression of the hydration process...

Sumedha Moharana

Papers

A refined shear lag model for adhesively bonded piezo-impedance transducers:

Piezoelectric Materials: Applications in SHM, Energy Harvesting and Bio-mechanics

A continuum based modelling approach for adhesively bonded piezo-transducers for EMI technique

Influence of adhesive bond layer on power and energy transduction efficiency of piezo-impedance transducer:

Development and evaluation of an external reusable piezo-based concrete hydration-monitoring sensor: