Piezoresistive performance of hydrophobic cement-based sensors under moisture and chloride-rich environments. (February 2022)

• Record Type: Journal Article
• Authors: Dong, Wenkui; Li, Wengui; Guo, Yipu; Qu, Fulin; Wang, Kejin; Sheng, Daichao
• Is Part Of: Cement & concrete composites. Volume 126(2022)
• Publication Date: 2022-02
• Subjects: Silicone hydrophobic powder SHP -- Crystalline waterproofing admixture CWA; Cement-based sensor -- Piezoresistivity -- Waterproofing additive -- Carbon black -- Silicone hydrophobic powder -- Chloride; Composite-reinforced concrete -- Periodicals; Concrete -- Periodicals; Composite materials -- Periodicals; Composites de ciment -- Périodiques; Béton -- Périodiques; Composites -- Périodiques; Béton léger -- Périodiques; Cement composites; Composite materials; Composite-reinforced concrete; Concrete; Lightweight concrete; Periodicals; Electronic journals; 620.135
• DOI: 10.1016/j.cemconcomp.2021.104379
• Languages: English
• ISSNs: 0958-9465

Abstract

Abstract: Silicone hydrophobic powder (SHP) and crystalline waterproofing admixture (CWA) were used to improve the impermeability of carbon black (CB)/cement-based sensors. The mechanical, electrical and piezoresistive properties, waterproofing and chloride resistance of CB/cementitious composites were investigated in this study. The piezoresistivity before or after different durations of immersion in freshwater and 3% sodium chloride solution and the stability in freshwater and marine environment were studied and compared. The results show that compressive strength increased with the additions of CWA and SHP, while the tensile strength slightly decreased with CWA, due to the formation of crystalline. Moreover, cementitious composites with SHP exhibited the best water impermeability, while the counterpart containing CWA presented the optimal chloride resistance. Although cementitious composites with SHP exhibited the highest electrical resistivity, the most stable piezoresistivity occurred after 90 days of immersion in freshwater. On the other hand, cementitious composites incorporating CWA presented the lowest electrical resistivity, but the piezoresistivity continually decreased with the immersion duration. Because of the free ions, piezoresistivity increased as a result of the immersion in sodium chloride solution. The related results will provide an insight into the piezoresistivity of hydrophobic cement-based sensors under moisture and chloride environments for future structural health monitoring. Highlights: Specimens with SHP exhibited the highest resistivity while the one with CWA had the lowest resistivity. Compressive strength with CWA and SHP were increased by the improved microstructures. CB/cementitious composites with CWA presented better chloride resistance than the counterpart with SHP. The best piezoresistivity occurred for 1.0% SHP after immersed in freshwater and sodium chloride solution. Microstructures containing CWA showed the needle-shaped crystals filling the cracks and pores.