EMBEDDED FIBRE OPTIC MICRO STRAIN SENSORS FOR ASSESSMENT OF SHRINKAGE AT VERY EARLY AGES
Durability is a main concern of high-performance concrete. Particularly microcracks candiminish strength and durability. The majority of the microcracks occur due to restrainedshrinkage and temperature deformations at early ages. Embedded fibre optic micro strainsensors are able to measure even slightest deformations of the microstructure. Two types ofsensors are used to assess material deformation: stiff fibre Bragg grating (FBG) sensors andcompliant fibre optic Fabry-Perot (EFPI) sensors. Measurements of deformations at early agesby using compliant fibre optic sensors with low resistance reaction as well as the assessmentof restraining effects of reinforcement steel offered new insights into cementitious matrices.Important aspects with regard to the durability of embedded glass fibre sensors and to theuncertainty of the measurement results are addressed; results are presented. The deformationmeasurement results were validated by using computed X-ray tomography.
Cementitious materials early-age deformations fibre optic sensors high-performance concrete microstructure durability
S.Schuler W.Habel B.Hillemeier
Technische Universitat Berlin,Germany Federal Institute for Materials Research and Testing (BAM) Berlin,Germany
国际会议
南京
英文
1377-1387
2008-10-13（万方平台首次上网日期，不代表论文的发表时间）