Smart composites, which are composed of piezoelectric ceramics and cement-based materials, have been developed for sensing and health monitoring of concrete infrastructure. Barium titanate (BT)-Portland cement (PC)-polyvinylidene fluoride (PVDF) composites with 40-60 vol.% BT particles (with a median size of ~ 425 µm) and 0-7 vol.% PVDF were fabricated by the pressing and curing method. The effects of the PVDF content on the acoustic impedance (Z_c), dielectric constant (ε_r), piezoelectric charge coefficient (d₃₃) and piezoelectric voltage coefficient (g₃₃) of the BT-PC-PVDF composites were investigated. Increasing the PVDF content in the composites led to a decrease in the Z_c value so that it approached that of concrete. The PC phase was replaced by the PVDF phase in the BT-cement-based composites to reduce the leakage current in these composites. As a result, the piezoelectric properties of the BT-PC-PVDF composites improved noticeably. BT contents of 50 and 60 vol.% and a PVDF of 5 vol.% had the highest d₃₃~24-25 pC/N. Moreover, the composite with 50 vol.% BT and 5 vol.% PVDF had the highest piezoelectric voltage coefficient herein (g₃₃=14.6 × 10^-3 V∙m/N).

由压电陶瓷和水泥基材料组成的智能复合材料已被开发用于混凝土基础设施的传感和健康监测。通过压制制备了钛酸钡（BT）-硅酸盐水泥（PC）-聚偏二氟乙烯（PVDF）复合材料，其中BT颗粒为40-60％（体积）（中值粒径为425 µm），PVDF为0-7％（体积）。和固化方法。研究了PVDF含量对BT-PC-PVDF复合材料的声阻抗（Z _c），介电常数（_εr），压电电荷系数（d ₃₃）和压电电压系数（g ₃₃）的影响。复合材料中PVDF含量的增加导致Z _c的降低价值，使其接近具体价值。在BT-水泥基复合材料中，PC相被PVDF相取代，以减少这些复合物中的泄漏电流。结果，BT-PC-PVDF复合材料的压电性能显着改善。的50和60％（体积）BT内容和5体积％的PVDF具有最高的d ₃₃〜24-25 PC / N。此外，具有50体积％的BT和5体积％的PVDF的复合物在此具有最高的压电电压系数（g ₃₃＝ 14.6×10 ^-3 V·m / N）。