Release Time:2019-03-11  Hits:

Indexed by: Journal Article

Date of Publication: 2018-06-01

Journal: COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING

Included Journals: EI、SCIE

Volume: 109

Page Number: 303-320

ISSN: 1359-835X

Key Words: Multifunctional composites; Smart materials; Electrical properties; Assembly

Abstract: Electrostatic self-assembled CNT/NCB composite fillers with high CNT aspect ratio and large NCB size is incorporated into cement-based materials to develop smart cement-based composites. The mechanical, electrical and piezoresistive properties of the cement-based materials with CNT/NCB composite fillers are investigated. Percolation equation is used to describe electrically conductive property. Electrochemical impedance spectroscopy and equivalent circuits are used to explore the conductive and mechanical mechanism. The research results show that cement-based materials with CNT/NCB composite fillers at low content present acceptable mechanical property, high conductive property and stable and sensitive piezoresistive property. The fractional change of electrical resistivity, stress and strain sensitivity of cement-based materials with 1.41 vol.% CNT/NCB composite fillers can reach 13.4%, 3.12%/MPa and 521, respectively. It is concluded that high CNT aspect ratio and large NCB size in CNT/NCB composite fillers are beneficial for improving the properties of smart cement based composites.