Title

Measurement of Early-Age Strains in Mortar Specimens Subjected to Cyclic Temperature

Abstract

As well known, the volume change induced by environment temperature variation can lead to cracking at the surface of cementitious materials with low water-cement ratio. Thus, it can be said that there is a pressing need to reveal the early-age performance of cementitous materials in a variable environment temperature. Conventional thermocouple and strain gauge have been widely used for measuring temperature and strain in cementitious materials, respectively. However, conventional sensors have several limitations for measuring strain and temperature in cementitous materials such as too many cables for multipoint measurement, short circuit, and electromagnetic interference. Compared to conventional electrical strain gauge, fiber Bragg grating (FBG) has several inherent advantages including multiplexable, resistance to electromagnetic interference, and stable signal in long distance transmission. In this study, two lines mutiplexed with FBG strain and temperature sensors were fabricated and employed to measure the quasi-distributed strain and temperatures in mortar specimens subjected to cyclic temperature.

Department(s)

Civil, Architectural and Environmental Engineering

Comments

The financial support from China Ministry of Science and Technology under 2015CB655104 is greatly acknowledged. Science and Information Technology of Guangzhou under the Grant of 2013J4500069 and Hong Kong Research Grant Council under the Grant of 615412 are also acknowledged.

Keywords and Phrases

Electromagnetic pulse; Electromagnetic wave interference; Mortar; Signal interference; Strain; Strain gages; Temperature sensors; Thermocouples; Cementitious materials; Cyclic temperatures; Electrical strain gauges; Environment temperature; Long distance transmission; Mortar specimens; Multipoint measurement; Strain and temperature sensors; Fiber Bragg gratings (FBG); Mortar specimen

International Standard Serial Number (ISSN)

0167-577X

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2015 Elsevier, All rights reserved.

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