Measurement of concrete shrinkage using fabry-perot fiber-optic sensor

Title: Measurement of concrete shrinkage using fabry-perot fiber-optic sensor
Author(s): P.L. Ng, H.H.C. Wong, I.Y.T. Ng, A.K.H. Kwan
Paper category : conference
Book title: 2nd International RILEM Symposium on Advances in Concrete through Science and Engineering
Editor(s): J. Marchand, B. Bissonnette, R. Gagné, M. Jolin and F. Paradis
Print-ISBN: 2-35158-003-6
e-ISBN: 2351580028
Publisher: RILEM Publications SARL
Publication year: 2006
Nb references: 15
Language: English

Abstract: The Fabry-Perot sensor is one type of fiber-optic sensing technology based on interferometry principles. It is designed to measure localised strains with high precision. As one of its multiple applications, the sensor can be cast in concrete to become embedded fiber-optic strain gauge. This paper presents the use of Fabry-Perot sensors in a long-term concrete shrinkage experiment conducted in The University of Hong Kong. In this study, shrinkage test specimens are cast from 5 concrete mixes covering conventional concrete (with and without shrinkage reducing agents), high strength concrete and self-consolidating concrete. The specimens are all prismatic with dimensions 75 mm by 75 mm by 250 mm. Each of them is instrumented with a fiber-optic sensor. Shrinkage strain measurements are taken up to one-year period. The Fabry-Perot sensors have been testified to possess good robustness and stability. Experimental results revealed the one-year shrinkage strains (as well as the estimated ultimate shrinkage strains) of the specimens are within the range of 400 to 700 microstrains. The shrinkage strain measurements provide important information for evaluation of shrinkage half-time, which is found to be around two weeks for mixes without addition of shrinkage reducing agent.

Online publication: 2006-08-02
Classification: 3.2 Theme 2: From Fresh to Hardened Concrete
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2351580028.071