Improving the mechanical, radiation shielding and aging piezoelectric properties of multifunctional lead-free BCTS ceramic-Portland cement composites modified with carbon nanotubes

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This study presents new insights into improving the mechanical, radiation shielding and aging piezoelectric properties of multifunctional lead-free BCTS ceramic-Portland cement composites modified with carbon nanotubes for simultaneous structural health monitoring and radiation shielding applications. This study evaluates the influence of CNTs on mechanical, acoustic, radiation shielding, aging piezoelectric properties, and identifies the optimal composition for enhanced composite performance. An increasing trend in compressive strength, hardness, dielectric constant and electrical conductivity were observed with CNTs addition. The highest measured piezoelectric values were composite with 1 vol% CNTs. A maximum piezoelectric voltage coefficient (g 33 ) was observed at 1 vol% CNTs, ∼10.36% higher than that of the composite without CNT. An additional CNTs leads to improved mechanical, radiation shielding and piezoelectric performance of composite. All composites showed good compatibility with concrete and mechanical strengths comparable to conventional concrete structures. All composites have hardness and mass attenuation coefficient than hardened cement. During the aging period of 1 to 60 days, g 33 of the composites remained superior to those of the BCTS ceramic, demonstrating the highlighted benefit of the composite.