Ohmic heating curing of carbon fiber/carbon nanofiber synergistically strengthening cement-based composites as repair/reinforcement materials used in ultra-low temperature environment. (October 2019)

• Record Type: Journal Article
• Authors: Liu, Yushi; Wang, Mingzhi; Tian, Weichen; Qi, Beimeng; Lei, Zhongyao; Wang, Wei
• Is Part Of: Composites. Volume 125(2019)
• Publication Date: 2019-10
• Subjects: A. Carbon nanotubes and nanofibers -- A. Carbon fibres -- B. Electrical properties -- C. Numerical analysis; Composite materials -- Periodicals; Manufacturing processes -- Periodicals; Composite materials; Manufacturing processes; Periodicals; 620.11805
• DOI: 10.1016/j.compositesa.2019.105570
• Languages: English
• ISSNs: 1359-835X

Abstract

Abstract: The repair/reinforcement of construction structures have been a challenge due to hydration termination of cement-based materials in an ultra-low temperature environment. This work presents a Carbon Fiber (CF)/Carbon Nanofiber (CNF) synergistically strengthening cement-based composite (CM-CF/CNF) as a repair/reinforcement material, in which ohmic heating curing of CM-CF/CNF is utilized to enhance structural strength at ultra-low temperature. Conductive paths in cement-based composite are formed with added CFs, which also improves mechanical properties, and the stabilization of the conductive network constructed by CFs is enhanced by incorporation of CNFs. A numerical model is established to evaluate CFs bridging behavior, and the role of CNFs in the stabilization of conductive network is numerically discussed based on permeation theory. A continuous maintenance of temperature is achieved with CM-CF/CNF cured by ohmic heating at −20 °C, and the cured sample shows superior 2-day compressive and flexural strengths of 49.2 MPa and 11.5 MPa, respectively.