In the field of roads, due to the effect of vehicle loads, piezoelectric materials under the road surface can convert mechanical vibration into electrical energy, which can be further used in road facilities such as traffic signals and street lamps. The barium titanate/polyvinylidene fluoride (BaTiO 3 /PVDF) composite, the most common hybrid ceramic-polymer system, was widely used in various fields because the composite combines the good dielectric property of ceramic materials with the good flexibility of PVDF material. Previous studies have found that conductive particles can further improve the dielectric and piezoelectric properties of other composites. However, few studies have investigated the effect of conductive carbon black on the dielectric and piezoelectric properties of BaTiO 3 /PVDF composites. In this study, BaTiO 3 /PVDF/conductive carbon black composites were prepared with various conductive carbon black contents based on the optimum ratio of BaTiO 3 to PVDF. The effects of conductive carbon black content on the morphologies, thermal performance, conductivities, dielectric properties, and piezoelectric properties of the BaTiO 3 /PVDF/conductive carbon black composites were then investigated. The addition of conductive carbon black greatly enhances the conductivities, dielectric properties, and piezoelectric properties of the BaTiO 3 /PVDF/conductive carbon black composites, especially when the carbon black content is 0.8% by weight of PVDF. Additionally, the conductive carbon black does not have an obvious effect on the morphologies and thermal stabilities of BaTiO 3 /PVDF/conductive carbon black composites.

<abstract> <p>Semi-rigid base materials are used in all pavement grades and are shown to have excellent stability. Furthermore, semi-rigid bases are known for their stiffness and strong frost resistance. However, these semi-rigid base materials are starting to require significant levels of maintenance and repair due to wear and tear. Maintenance is performed primarily to add pavement and resurfacing material, with the hope that the resurfacing layer can withstand large tensile and shear forces at the cracks of the base, thus increasing the overall durability of the pavement. Furthermore, crushing technology used for cement panel maintenance can be used to eliminate cracks in the overlay layer thus improving overall service life expectancy. The studies below study the application of crushing technology to a semi-rigid base and the subsequent alternation to the structural design of the pavement. Furthermore, the mechanical index sensitivities of pavement structures post-rubblization were analyzed using finite elements. Mechanical indexes with high sensitivity were subsequently adopted as structural damage control indexes. These indexes were used to optimize overlay structure and provide a reference for structural design post-rubblization.</p> </abstract>