An Innovative Smart Concrete Anchorage with Self-Stress Sensing Capacity of Prestressing Stress of PS Tendon
- Authors
- Lee, Seon Yeol; Le, Huy Viet; Kim, Min Kyoung; Kim, Dong Joo; Park, Jongwoong
- Issue Date
- Aug-2021
- Publisher
- MDPI
- Keywords
- self-stress sensing; smart concrete anchorage; prestressing stress; smart ultra-high-performance concrete
- Citation
- SENSORS, v.21, no.15
- Journal Title
- SENSORS
- Volume
- 21
- Number
- 15
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/49603
- DOI
- 10.3390/s21155251
- ISSN
- 1424-8220
1424-3210
- Abstract
- An innovative smart concrete anchorage (SCA) has been developed for monitoring the stress of prestressing (PS) tendons by utilizing smart ultra-high-performance concrete (UHPC). The smart UHPC contained 2 vol% steel fibers and fine steel slag aggregates instead of silica sands. The effects of different electrode materials, arrangements, and connectors on the self-stress sensing capacity of the SCA are discussed. A prototype SCA demonstrated its feasibility and sufficient self-stress sensing capacity to be used in monitoring the prestressing loss of the PS tendon. As the tensile stress of the PS tendon increased from 0 to 1488 MPa, the fractional change in resistivity (FCR) of the prototype SCA, with horizontally paired copper wire electrodes and a plug-in type connector, decreased linearly from 0% to -1.53%, whereas the FCR increased linearly from -1.53% to -0.04% as the tensile stress of the PS tendon decreased from 1488 to 331 MPa.
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