Abstract
AbstractStructural health monitoring (SHM) using self‐sensing cement‐based materials has been reported before, where nano‐fillers have been incorporated in cementitious matrices as functional sensing elements. A percolation threshold is always required in order for conductive nano‐fillers modified concrete to be useful for SHM. Nonetheless, the best pressure/strain sensitivity results achieved for any self‐sensing cementitious matrix are <0.01 MPa−1. In this work, we introduce for the first‐time novel partially reduced graphene oxide based electronic textile (e‐textile) embedded in plain and as well as in polymer‐binder‐modified cementitious matrix for SHM applications. These e‐textile embedded cementitious composites are independent of any percolation threshold due to the interconnected fabric inside the host matrix. The piezo‐resistive response was measured by applying direct and cyclic compressive loads (ranging from 0.10 to 3.90 MPa). A pressure sensitivity of 1.50 MPa−1 and an ultra‐high gauge factor of 2000 was obtained for the system of the self‐sensing cementitious structure with embedded e‐textiles. The sensitivity of this new system with embedded e‐textile is an order of magnitude higher than the state‐of‐the‐art nanoparticle based self‐sensing cementitious composites. The composites showed mechanical stability and functional durability over long‐term cyclic compression tests of 1000 cycles. Additionally, a two time‐constant model was used to validate the experimental results on decay response of the e‐textile embedded composites.
Highlights
Civil infrastructure plays a vital role in our societal and economic growth
We present the application of partially reduced graphene oxide-coated Nylon® textile as the piezo-resistive strain-sensing element in a cement-based system
The pressure sensitivity (PS) and the corresponding strain sensitivities for these measurements can be estimated by the following equations[51]: Pressure sensitivity (PS): PS =
Summary
Civil infrastructure (dams, bridges, tunnels, road network etc.) plays a vital role in our societal and economic growth. The integrity of concrete and cement related materials largely depend on their ability to withstand mechanical and environmental weathering. In order to monitor the in-service integrity of the cement-based structures, structural health monitoring (SHM) is deemed vital especially for the safety of the critical components.[3] SHM can provide real-time data about the condition of a structure by using suitable sensors. This will allow for timely intervention in critical situations minimizing considerably the maintenance regimes and extending the service life of an infrastructure asset. Some work has been reported on the technologies involving SHM and Internet of Things (IoT).[11,12] The basic principle here is to acquire the real-time data from the sensors by integration of radio frequency identification (RFID) tag antennas, wireless sensors network (WSN), and sensors
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