Hybrid optical-fibre/geopolymer sensors for structural health monitoring of concrete structures

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

In this work, we demonstrate hybrid optical-fibre/geopolymer sensors for monitoring temperature, uniaxial strain and biaxial strain in concrete structures. The hybrid sensors detect these measurands via changes in geopolymer electrical impedance, and via optical wavelength measurements of embedded fibre Bragg gratings. Electrical and optical measurements were both facilitated by metal-coated optical fibres, which provided the hybrid sensors with a single, shared physical path for both voltage and wavelength signals. The embedded fibre sensors revealed that geopolymer specimens undergo 2.7 mepsilon of shrinkage after one week of curing at 42 °C. After curing, an axial 2 mepsilon compression of the uniaxial hybrid sensor led to impedance and wavelength shifts of 7 × 10−2 and −2 × 10−4 respectively. The typical strain resolution in the uniaxial sensor was 100 $\mu \varepsilon $. The biaxial sensor was applied to the side of a concrete cylinder, which was then placed under 0.6 mepsilon of axial, compressive strain. Fractional shifts in impedance and wavelength, used to monitor axial and circumferential strain, were 3 × 10−2 and 4 × 10−5 respectively. The biaxial sensor's strain resolution was approximately 10 $\mu \varepsilon $ in both directions. Due to several design flaws, the uniaxial hybrid sensor was unable to accurately measure ambient temperature changes. The biaxial sensor, however, successfully monitored local temperature changes with 0.5 °C resolution.
LanguageEnglish
Article number045011
Number of pages8
JournalSmart Materials and Structures
Volume24
Issue number4
DOIs
Publication statusPublished - 24 Feb 2015

Fingerprint

Geopolymers
concrete structures
structural health monitoring
Structural health monitoring
Hybrid sensors
Concrete construction
Optical fibers
optical fibers
sensors
Sensors
Wavelength
Curing
axial strain
curing
Acoustic impedance
wavelengths
Fiber Bragg gratings
Temperature
impedance
metal fibers

Keywords

  • remote sensing
  • geopolymer sensors
  • health monitoring

Cite this

@article{3b1274b2b679447eba99a444bb4d6204,
title = "Hybrid optical-fibre/geopolymer sensors for structural health monitoring of concrete structures",
abstract = "In this work, we demonstrate hybrid optical-fibre/geopolymer sensors for monitoring temperature, uniaxial strain and biaxial strain in concrete structures. The hybrid sensors detect these measurands via changes in geopolymer electrical impedance, and via optical wavelength measurements of embedded fibre Bragg gratings. Electrical and optical measurements were both facilitated by metal-coated optical fibres, which provided the hybrid sensors with a single, shared physical path for both voltage and wavelength signals. The embedded fibre sensors revealed that geopolymer specimens undergo 2.7 mepsilon of shrinkage after one week of curing at 42 °C. After curing, an axial 2 mepsilon compression of the uniaxial hybrid sensor led to impedance and wavelength shifts of 7 × 10−2 and −2 × 10−4 respectively. The typical strain resolution in the uniaxial sensor was 100 $\mu \varepsilon $. The biaxial sensor was applied to the side of a concrete cylinder, which was then placed under 0.6 mepsilon of axial, compressive strain. Fractional shifts in impedance and wavelength, used to monitor axial and circumferential strain, were 3 × 10−2 and 4 × 10−5 respectively. The biaxial sensor's strain resolution was approximately 10 $\mu \varepsilon $ in both directions. Due to several design flaws, the uniaxial hybrid sensor was unable to accurately measure ambient temperature changes. The biaxial sensor, however, successfully monitored local temperature changes with 0.5 °C resolution.",
keywords = "remote sensing, geopolymer sensors, health monitoring",
author = "M Perry and M Saafi and G Fusiek and P Niewczas",
year = "2015",
month = "2",
day = "24",
doi = "10.1088/0964-1726/24/4/045011",
language = "English",
volume = "24",
journal = "Smart Materials and Structures",
issn = "0964-1726",
number = "4",

}

Hybrid optical-fibre/geopolymer sensors for structural health monitoring of concrete structures. / Perry, M; Saafi, M; Fusiek, G; Niewczas, P.

In: Smart Materials and Structures, Vol. 24, No. 4, 045011, 24.02.2015.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Hybrid optical-fibre/geopolymer sensors for structural health monitoring of concrete structures

AU - Perry, M

AU - Saafi, M

AU - Fusiek, G

AU - Niewczas, P

PY - 2015/2/24

Y1 - 2015/2/24

N2 - In this work, we demonstrate hybrid optical-fibre/geopolymer sensors for monitoring temperature, uniaxial strain and biaxial strain in concrete structures. The hybrid sensors detect these measurands via changes in geopolymer electrical impedance, and via optical wavelength measurements of embedded fibre Bragg gratings. Electrical and optical measurements were both facilitated by metal-coated optical fibres, which provided the hybrid sensors with a single, shared physical path for both voltage and wavelength signals. The embedded fibre sensors revealed that geopolymer specimens undergo 2.7 mepsilon of shrinkage after one week of curing at 42 °C. After curing, an axial 2 mepsilon compression of the uniaxial hybrid sensor led to impedance and wavelength shifts of 7 × 10−2 and −2 × 10−4 respectively. The typical strain resolution in the uniaxial sensor was 100 $\mu \varepsilon $. The biaxial sensor was applied to the side of a concrete cylinder, which was then placed under 0.6 mepsilon of axial, compressive strain. Fractional shifts in impedance and wavelength, used to monitor axial and circumferential strain, were 3 × 10−2 and 4 × 10−5 respectively. The biaxial sensor's strain resolution was approximately 10 $\mu \varepsilon $ in both directions. Due to several design flaws, the uniaxial hybrid sensor was unable to accurately measure ambient temperature changes. The biaxial sensor, however, successfully monitored local temperature changes with 0.5 °C resolution.

AB - In this work, we demonstrate hybrid optical-fibre/geopolymer sensors for monitoring temperature, uniaxial strain and biaxial strain in concrete structures. The hybrid sensors detect these measurands via changes in geopolymer electrical impedance, and via optical wavelength measurements of embedded fibre Bragg gratings. Electrical and optical measurements were both facilitated by metal-coated optical fibres, which provided the hybrid sensors with a single, shared physical path for both voltage and wavelength signals. The embedded fibre sensors revealed that geopolymer specimens undergo 2.7 mepsilon of shrinkage after one week of curing at 42 °C. After curing, an axial 2 mepsilon compression of the uniaxial hybrid sensor led to impedance and wavelength shifts of 7 × 10−2 and −2 × 10−4 respectively. The typical strain resolution in the uniaxial sensor was 100 $\mu \varepsilon $. The biaxial sensor was applied to the side of a concrete cylinder, which was then placed under 0.6 mepsilon of axial, compressive strain. Fractional shifts in impedance and wavelength, used to monitor axial and circumferential strain, were 3 × 10−2 and 4 × 10−5 respectively. The biaxial sensor's strain resolution was approximately 10 $\mu \varepsilon $ in both directions. Due to several design flaws, the uniaxial hybrid sensor was unable to accurately measure ambient temperature changes. The biaxial sensor, however, successfully monitored local temperature changes with 0.5 °C resolution.

KW - remote sensing

KW - geopolymer sensors

KW - health monitoring

UR - http://iopscience.iop.org/0964-1726/24/4/045011/pdf/0964-1726_24_4_045011.pdf

U2 - 10.1088/0964-1726/24/4/045011

DO - 10.1088/0964-1726/24/4/045011

M3 - Article

VL - 24

JO - Smart Materials and Structures

T2 - Smart Materials and Structures

JF - Smart Materials and Structures

SN - 0964-1726

IS - 4

M1 - 045011

ER -