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Indexed by:Journal Papers

Date of Publication:2015-12-01

Journal:COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING

Included Journals:SCIE、EI、Scopus

Volume:79

Page Number:103-115

ISSN No.: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.