Roshan, M.J.; Abedi, M.; Gomes Correia, A.; Fangueiro, R.; Mendes, P.M. A Multifunctional Cementitious Composite for Pavement Subgrade. Materials2024, 17, 621.
Roshan, M.J.; Abedi, M.; Gomes Correia, A.; Fangueiro, R.; Mendes, P.M. A Multifunctional Cementitious Composite for Pavement Subgrade. Materials 2024, 17, 621.
Roshan, M.J.; Abedi, M.; Gomes Correia, A.; Fangueiro, R.; Mendes, P.M. A Multifunctional Cementitious Composite for Pavement Subgrade. Materials2024, 17, 621.
Roshan, M.J.; Abedi, M.; Gomes Correia, A.; Fangueiro, R.; Mendes, P.M. A Multifunctional Cementitious Composite for Pavement Subgrade. Materials 2024, 17, 621.
Abstract
Premature failure and degradation of layers are the main problems for transportation infrastruc-ture. Addressing these issues necessitates implementing structural health monitoring (SHM) for transportation layers. This strategic approach is instrumental in mitigating maintenance expenses, prolonging the operational lifespan, and preventing accidents resulting from abrupt layer col-lapse. To this end, this research investigated the stress/strain and damage detection capabilities of a self-sensing cementitious composite developed for potential utilization in the construction of an intelligent subgrade layer. The prepared self-sensing cementitious composite consisted of 10% cement and hybrid conductive fillers, including multiwalled carbon nanotubes (MWCNTs) and graphene nanoplatelets (GNPs) in sand. Initial findings reveal that the electrical resistivity of the composite is significantly affected by the concentration of MWCNTs/GNPs, with a minimum concentration of more than 0.5% needed to achieve a responsive cementitious composite. More-over, the piezoresistive analysis indicates that an increase in the concentration of MWCNTs/GNPs and stress levels leads to an improvement in the stress/strain sensing perfor-mance. When the self-sensing cementitious composite is subjected to equivalent stress levels, variations in the FCR exhibit an increasing trend with decreasing resilient modulus, stemming from a decrease in stiffness due to the increased concentration of MWCNTs/GNPs. Additionally, the EIS analysis demonstrates a contraction for the Nyquist curves under compressive ramp loading prior to failure, followed by the expansion of these curves postfailure. Scanning electron microscopy (SEM) images visually showcase the bridging effects of MWCNTs and the filling ef-fects of GNPs within the composite structure.
Engineering, Architecture, Building and Construction
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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