Journal
MATERIALS LETTERS
Volume 145, Issue -, Pages 344-346Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2015.01.140
Keywords
Early-age shrinkage; Cracking; Low water-to-cement ratio mortar; Distributed optical fiber; PPP-BOTDA
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In this study, a new method to measure strain distribution and detect cracking with pulse pre-pump Brillouin optical time domain analysis (PPP-BOTDA) is proposed. A mortar cylinder was cast in a corrugated polyethylene mold with two end plugs and tested according to ASTM C1698 for autogenous shrinkage. It was instrumented with two sensors made of a single optical fiber: one for combined strain and temperature measurement and the other for temperature compensation. The shrinkage-induced compressive strain was non-uniformly distributed over the sensor length. The average of the distributed strain was in excellent agreement with autogenous shrinkage that can be determined from the ASTM test. The location and magnitude of each peak of the distributed strain can be used to detect a corresponding invisible hidden crack. (C) 2015 Elsevier B.V. All rights reserved.
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