研究目的
Measuring the heterogeneity of cement paste by truly distributed optical fiber sensors.
研究成果
The home-built Rayleigh scattering based OFDR system can be used for strain monitoring in cement based materials, and the measurement accuracy may increase with the increasing ages of the material. The advantage of this technique is demonstrated by its ability to measure uneven strain distribution along the beam with a high spatial resolution.
研究不足
The small deviations results from the viscoelastic nature of early age cement paste, the heterogeneity of the paste microstructure, and the debonding of fiber optic sensors.
1：Experimental Design and Method Selection:
A home-built Rayleigh scattering based optical frequency domain reflectometry (OFDR) technique is used for the measurement of strain distribution in a loaded cement paste.
2：Sample Selection and Data Sources:
Cement paste was prepared with a Hobart mixer and cast into steel molds in which the optical fibers have been placed.
3：List of Experimental Equipment and Materials:
Type I Portland cement from Holcim, tunable laser source (TLS, Agilent 81680A), optical fiber sensor.
4：Experimental Procedures and Operational Workflow:
The distributed optical fiber sensors are embedded in a cement paste cantilever. A controlled deflection is applied at the free end of it, and the strain is measured.
5：Data Analysis Methods:
The results are compared with the values obtained from theoretical analysis using Euler-Bernoulli beam theory and a finite element simulation.
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