Abstract
The self-damage sensing capacity of high-performance fiber-reinforced cementitious composites (HPFRCCs) that blended long- (1 vol %) and medium-length (1 vol %) smooth steel fibers was considerably improved by adding milled glass fibers (MGFs) with a low electrical conductivity to a mortar matrix. The addition of MGFs (5 wt %) significantly increased the electrical resistivity of the mortar matrix from 45.9 to 110.3 kΩ·cm (140%) and consequently improved the self-damage sensing capacity (i.e., the reduction in the electrical resistivity during the tensile strain-hardening response) from 17.27 to 25.56 kΩ·cm (48%). Furthermore, the addition of MGFs improved the equivalent bond strength of the steel fibers on the basis of the higher pullout energy owing to the accumulated cementitious material particles attached to the surfaces of steel fibers.
Highlights
Structural health monitoring (SHM) has played a very important role in protecting human lives and the assets of human society from the catastrophic structural collapses associated with the early deterioration of construction materials
SHM mostly utilizes attached and/or embedded sensors; their durability is extremely low, especially compared with the long-term service lives of buildings or civil infrastructure, and their sensing area is very limited [1,2]. To overcome these limitations of the sensors used in present SHM systems, much research on the development of smart construction materials with self-sensing capacity has been conducted during the last two decades [3,4,5], the electromechanical response of cement-based composites under flexure was first reported by Wittmann [6] in 1973
The electrical resistance of high-performance fiber-reinforced cementitious composites (HPFRCCs) is greatly influenced by the distribution of electrically conductive fillers or fibers [15,27,29,31]; the suitable slump flow and slump of HPFRCCs should be carefully determined for the uniform distribution of fillers and fibers because the distribution of fibers is dependent upon the workability of SFRCs [50]
Summary
Structural health monitoring (SHM) has played a very important role in protecting human lives and the assets of human society from the catastrophic structural collapses associated with the early deterioration of construction materials. SHM mostly utilizes attached and/or embedded sensors; their durability is extremely low, especially compared with the long-term service lives of buildings or civil infrastructure, and their sensing area is very limited [1,2]. To overcome these limitations of the sensors used in present SHM systems, much research on the development of smart construction materials with self-sensing capacity has been conducted during the last two decades [3,4,5], the electromechanical response of cement-based composites under flexure was first reported by Wittmann [6] in 1973. Cement-based composites containing nanomaterials, e.g., carbon nanotubes and carbon nanofibers, have demonstrated a high
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