A spherical smart aggregate sensor based electro-mechanical impedance method for quantitative damage evaluation of concrete

Abstract

In this study, the concrete damage induced by compression is evaluated quantitatively using spherical smart aggregate sensor based on electro-mechanical impedance method. The sensitivity of the spherical smart aggregate sensor embedded in concrete cubes is investigated by comparing the electrical signals recorded during the compressive process with those of the smart aggregate sensor embedded in concrete cubes. Furthermore, the finite element model of concrete cube with an embedded spherical smart aggregate sensor is developed to simulate the concrete compressive tests. The concrete damaged plasticity constitutive model is utilized to simulate the concrete damage process. The numerical model is verified with the experimentally measured compressive test results. Finally, the damage volume ratio is presented to quantify the damage level of concrete based on the numerical model. The relationship between the root mean square deviation index of the conductance signatures obtained from experiments and the damage volume ratio computed by numerical simulation is established to quantify the concrete damage level. The results show that the spherical smart aggregate sensor is more sensitive than the smart aggregate sensor in monitoring the three-dimensional concrete structures. The proposed empirical fitting curve can effectively evaluate the concrete damage level quantitatively.

Self-Sensing Alkali-Activated Materials: A Review

“…The most common approach used in these applications is the strain sensitivity coefficient, otherwise known as the gauge factor (GF) which is also used in commercial strain gauges. The GF is calculated by the fractional change in resistance divided by the applied strain, Equation (6).…”

“…In a civil engineering context, self-sensing materials are components that can simultaneously detect measurands without the need of additional sensing instruments. Such materials include self-sensing cementitious materials [1,2], bricks [3,4], aggregates [5,6] and pavements [7,8]. In terms of self-sensing cementitious materials, extensive research has been carried out in both ordinary Portland cement (OPC) and alkali activated materials (AAM).…”

Multidirectional crack monitoring of concrete structures using 3D piezoceramic sensing array

“…Because of the 3D shape of piezoceramic‐to‐UHPC shell, SSA could offer omni‐dimensional actuating and sensing capability that extremely expends the scope of applications for the current SA‐based sensing technology. Following the studies of SSA dynamic properties, 23 researchers have utilized SSA for early age cement hydration monitoring 24 and damage characterization of concrete cube specimen 25 . The extraordinary omni‐dimensional actuating and sensing capability of SSA exhibits great suitability for multidirectional crack monitoring in concrete structures (Figure 2) and gives it ability to simplify the current SA‐based sensor deployment.…”

“…Following the studies of SSA dynamic properties, 23 researchers have utilized SSA for early age cement hydration monitoring 24 and damage characterization of concrete cube specimen. 25 The extraordinary omni-dimensional actuating and sensing capability of SSA exhibits great suitability for multidirectional crack monitoring in concrete structures (Figure 2) and gives it ability to simplify the current SA-based sensor deployment. However, these are still waiting for research validation.…”

Damage imaging of concrete wall-like structures using cylindrical concrete implantable module

“…With the rapid development of infrastructures, structural health monitoring (SHM) for civil engineering is becoming increasingly significant. [1][2][3][4][5] Concrete, owing to its extraordinary mechanical properties, low cost, and easy availability, has become the most commonly used building material in various constructions. When a concrete structure experiences long-term service, the impact of overload, corrosion, and collision from the environment can induce unexpected damage and accelerate structural degradation.…”