Abstract
The structural integrity of post-tensioning prestressed concrete structures with tendon ducts highly depends on the grouting quality in construction. This paper proposes a real-time approach to monitoring the grouting compactness in tendon ducts using the multi-sensing electro-mechanical impedance (EMI) method. When Lead Zirconate Titanate (PZT) transducers with different pre-selected dimensions are serially connected and mounted on a structure at distributed locations, each PZT provides unique resonance frequency coupled with the local structural physical property. Therefore, the impedance with multiple peaks of the serially connected multiple PZTs can be captured during a single measurement, which significantly simplifies the measurement procedure and reduces the data processing time. In addition, the wiring for the PZT sensors is also simplified. In this research, the feasibility of the proposed method was experimentally and numerically investigated to monitor the grouting compactness in a tendon duct specimen. The 3-dB mean absolute percentage deviation (MAPD) was applied to quantify the variations of the impedance signatures measured from five different grouting levels. Both experimental and numerical results verify the feasibility of using the proposed method for monitoring the grouting compactness in tendon ducts.
Highlights
Many factors contribute to the deterioration of civil infrastructures [1,2,3], and among them, corrosion exists in almost all structures [4,5,6] and is often responsible for various structural damages [7,8,9], such as cracks, reduced stiffness, and eventually reduced or lost bearing capacity
This paper demonstrates the feasibility of using the multi-sensing electro-mechanical impedance (EMI) method to monitor the grouting compactness
Three Lead Zirconate Titanate (PZT) wafers of different diameters, connected in series, were attached to different parts of the duct surface. The advantage of this method is that the impedance signature at different peak frequencies, which, corresponding to the physical properties at different locations of the duct, can be obtained through only one sweep
Summary
Many factors contribute to the deterioration of civil infrastructures [1,2,3], and among them, corrosion exists in almost all structures [4,5,6] and is often responsible for various structural damages [7,8,9], such as cracks, reduced stiffness, and eventually reduced or lost bearing capacity. Insufficient grouting of the prestressed tension duct provides channels for water/moisture migration and chloride diffusion [12], resulting in the corrosion of prestressing tendons, which may lead to the severe degradation of the bearing capacity of post-tensioned prestressed concrete structures [13,14,15].
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