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A Raman spectroscopy based optical fibre system for detecting carbonation profile of cementitious materials

Yue, Y; Wang, JJ; Basheer, PAM; Boland, JJ; Bai, Y; (2018) A Raman spectroscopy based optical fibre system for detecting carbonation profile of cementitious materials. Sensors and Actuators, B: Chemical , 257 pp. 635-649. 10.1016/j.snb.2017.10.160. Green open access

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Abstract

Sensors demonstrate huge potential in civil engineering for monitoring the health condition and performance of concrete structures. Amongst various chemical deterioration mechanisms causing inadequate durability of concrete structures, carbonation is one of the most severe mechanisms. It occurs from the chemical reactions between intruded CO 2 and calcium-bearing phases, hence is accompanied by the formation of calcium carbonate (CaCO 3 ) and the decrease of the alkalinity of concrete pore solution, causing corrosion of rebar in concrete. Thus, detecting carbonation process, especially, determining the carbonation profile (i.e. the content of carbonation products formed against the depth into concrete structure), is of great importance to the diagnosis of the health condition of concrete structures and the prediction of service life. Unfortunately, existing sensors for health monitoring systems suffer from various limitations. Optical fibre Raman technology offers a unique opportunity for developing a novel chemical sensor system capable of monitoring the service-condition of concrete in situ. In the current work, a bespoke ‘coaxial’ optical fibre sensing platform based on Raman spectroscopy was successfully established with a 514.5 nm laser. All the optics were tailored for efficiently exciting and receiving signals from cementitious materials, and their diameters were restricted within 0.5 in. in order to explore the feasibility of developing an embeddable miniature sensor system in the future. This sensing system was then employed to detect the carbonation mechanism of a plain Portland cement (PC) paste. The calcium carbonate polymorphs as well as the carbonation profile in the PC paste was successfully recognised and established with the results being verified favourably by bench-mounted Raman, X-ray Diffraction (XRD) and Thermogravimetry (TG) analyses. Our results demonstrate a good potential for developing a novel Raman spectroscopy based optical fibre sensor system for monitoring the health condition and the performance of concrete structures in future.

Type: Article
Title: A Raman spectroscopy based optical fibre system for detecting carbonation profile of cementitious materials
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.snb.2017.10.160
Publisher version: http://doi.org/10.1016/j.snb.2017.10.160
Language: English
Additional information: © 2017 Elsevier B.V. All rights reserved. This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Calcium carbonate; Carbonation; Concrete; Optical fiber sensor; Raman spectroscopy; Sensing platform
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10038593
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