Temperature Dependence of the Conductivity of Electrolyte Solutions

Meurs, N. van

doi:10.1038/1821532a0

Cited by 7 publications

(3 citation statements)

References 2 publications

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“…• Temperature: Increasing the temperature of an AAM enhances ion mobility and encourages electrolytic dissociation, both of which increase σ 0 . Provided there is no evaporation of water at elevated temperatures, AAM conductivity, σ, increases exponentially with temperature, T [43]. • Moisture: Water content within an AAM can affect all three terms in equation (3).…”

Section: Sensing Principlementioning

confidence: 99%

Self-sensing concrete repairs based on alkali-activated materials: recent progress

Perry

Biondi

McAlorum

et al. 2021

2021 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)

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This paper provides an overview of recent highlights from our development of robotically deployed, self-sensing alkaliactivated materials: a cement technology which can be used to simultaneously repair and monitor concrete structures. While strain and temperature sensing using these materials has already been demonstrated, this paper focuses on recent developments in robotic spray coating and 3D printing, and in moisture, chloride, and damage monitoring, showing pilot data. The electrical impedance of self-sensing materials follows an exponential decrease with increasing levels of moisture, chloride contamination and temperature as expected. The work demonstrates the promise of using these novel self-sensing materials for measuring environmental measurands that are responsible for the majority of concrete structural health degradation in the field.

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Section: Sensing Principlementioning

confidence: 99%

Self-sensing concrete repairs based on alkali-activated materials: recent progress

Perry

Biondi

McAlorum

et al. 2021

2021 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)

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“…When using geopolymers as temperature sensors, it is often adequate to consider only the response of the impedance magnitude, Z, on temperature, T [47]:…”

Section: Temperature Sensingmentioning

confidence: 99%

3D printed temperature-sensing repairs for concrete structures

Vlachakis

Perry

Biondi

et al. 2020

Additive Manufacturing

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Multifunctional coating materials have enjoyed extensive development within civil engineering in the last few decades, with numerous proposals for self-sensing and self-healing repairs. Less thought has been afforded to coating material deployment, but a reliance on conventional manual methods is leading to high costs and variabilities in performance. This is prohibiting the application of new materials in the field. This paper addresses this issue by outlining, for the first time a 3D printable temperature sensing repair for concrete. The multifunctional material used in this study is a geopolymer: a durable alternative to ordinary Portland cement repairs, which can be electrically interrogated to act as a sensor. In this paper, we outline the material and 3D printing process development, and demonstrate 3D printed repair patches with a temperature sensing precision of 0.1 °C, a long-term sensing repeatability of 0.3 °C, a compressive strength of 24 MPa, and an adhesion strength to concrete of 0.6 MPa. The work demonstrates the feasibility of using additive manufacturing as a new means of applying repairs to concrete substrates, and provides one clear pathway to removing some of the barriers to the field deployment of multifunctional materials in a civil engineering context. The process shown here could enhance the design versatility of self-sensing repairs, unlock remote deployment, and de-cost and de-risk actions that prolong the lifespan and performance of existing concrete structures.

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“…In contrast, Perry et al [26] reported a polynomial relationship between change in impedance and temperature change between 10-30 • C in a fly ash AAM investigation. More recent and in-depth work on filler free AAM applications between 5-30 • C and 10-30 • C conducted by Biondi et al [65] and Vlachakis et al [27] respectively showcased that the change in impedance in relation to temperature follows an exponential trend (Equation (8)) expressed by [155] such that:…”

Section: Temperature Sensing: Characterization Equationmentioning

confidence: 99%

Self-Sensing Alkali-Activated Materials: A Review

2020

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Alkali-activated materials are an emerging technology that can serve as an alternative solution to ordinary Portland cement. Due to their alkaline nature, these materials are inherently more electrically conductive than ordinary Portland cement, and have therefore seen numerous applications as sensors and self-sensing materials. This review outlines the current state-of-the-art in strain, temperature and moisture sensors that have been developed using alkali activated materials. Sensor fabrication methods, electrical conductivity mechanisms, and comparisons with self-sensing ordinary Portland cements are all outlined to highlight best practice and propose future directions for research.

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Temperature Dependence of the Conductivity of Electrolyte Solutions

Cited by 7 publications

References 2 publications

Self-sensing concrete repairs based on alkali-activated materials: recent progress

Self-sensing concrete repairs based on alkali-activated materials: recent progress

3D printed temperature-sensing repairs for concrete structures

Self-Sensing Alkali-Activated Materials: A Review

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