RESEARCH ARTICLE


The Monitoring and Feedback for the Construction Quality of the Mass Concrete Based on the Distributed Optical-Fiber Temperature Measurement System



Feng Jin*, 1, 2, Yihong Zhou2
1 State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, 430072, P.R. China
2 College of Hydraulic & Environmental Engineering, China Three Gorges University, Yichang 443002, P.R. China


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Creative Commons License
© 2015 Jin and Zhou;

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, 430072, P.R. China; Tel: 15501162945; E-mail: jf@whu.edu.cn


Abstract

Temperature control is a key factor which affects the construction quality of the mass concrete, which is also an important measure to prevent crack propagation. Lots of engineering practices show that most of temperature cracks come out in the form of the surface crack during the construction of the concrete dam. In addition, deep cracks and transverse cracks are usually developed by surface cracks. Strengthening conversation and surface insulation are one of the main methods to prevent surface cracks. In this paper, Xiluodu hydropower dam is taken as the engineering background, and an insulation monitoring experiment under the winter low-temperature condition was carried out on the fresh concrete layer during the construction period using the distributed fiber optic temperature monitoring system. The inversion of the equivalent heat coefficient for the fresh concrete layer with the covering of the polyethylene membrane insulation materials was conducted, besides the monitoring results and the feedback analysis of the conservation status was obtained based on the test data. The above procedure provides a basis for evaluating the quality of construction and the dynamic adjustment of the construction programs.

Keywords: Mass concrete, distributed fiber optic monitoring, temperature control, construction quality.