Abstract
AbstractIn this study, polypropylene (PP) was added to develop carbon black (CB)/cementitious composites as cement-based sensors. The mechanical properties and piezoresistivity were been experimentally investigated. The compressive strength slightly decreased, while the flexural strength was significantly increased with the increased amount of PP fibres. The improvement is mainly achieved by the reduced CB concentration in cement matrix and the excellent tensile strength of PP fibres. Under the cyclic compression, the piezoresistivity increased by three times for 0.4 wt% PP fibres filled CB/cementitious composite, regardless of the loading rates. The flexural stress sensing efficiency was considerably lower than that of compressive stress sensing, but it increased with the amount of PP fibres. Electrical conductivity increased with the amount of PP fibres, due to the enclosed CB nanoparticles and more conductive passages. Moreover, fitting formulas were proposed and used to evaluate the self-sensing capacity, with the attempts to apply cement-based sensors for structural health monitoring.KeywordsCement-based sensorCarbon blackPolypropylene fibrePiezoresistivityMicrostructure
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