Release Time:2019-03-09  Hits:

Indexed by: Journal Papers

Date of Publication: 2015-12-01

Journal: COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING

Included Journals: Scopus、EI、SCIE

Volume: 79

Page Number: 103-115

ISSN: 1359-835X

Key Words: Smart materials; Electrical properties; Mechanical properties; Assembly

Abstract: Electrostatic self-assembled carbon nanotube (CNT)/nano carbon black (NCB) composite fillers are added into cement mortar to fabricate smart cement-based materials. The grape bunch structure of CNT/NCB composite fillers is beneficial for dispersing CNT/NCB in cement mortar matrix and achieving cooperative improvement effect. The mechanical, electrically conductive, and piezoresistive behaviors of the cement mortar are investigated. The CNT/NCB composite fillers can effectively enhance the flexural strength and electrical conductivity of cement mortars, and endow stable and sensitive piezoresistivity to cement mortar at a low filler content. However, they weaken the compressive strength of cement mortar to some extent. The percolation threshold zone of cement mortar with CNT/NCB composite fillers ranges in the amount of 0.39-1.52 vol.%. The optimal content of CNT/NCB composite fillers is 2.40 vol.% for piezoresistivity and the stress and strain sensitivities can reach 2.69% MPa-1 and 704, respectively. (C) 2015 Elsevier Ltd. All rights reserved.