Correlation between damage evolution and resistivity reaction of concrete in-filled with graphene nanoplatelets. (30th May 2019)

• Record Type: Journal Article
• Authors: Liu, Qiong; Wu, Wenxin; Xiao, Jianzhuang; Tian, Yuting; Chen, Jinyi; Singh, Amardeep
• Is Part Of: Construction & building materials. Volume 208(2019)
• Page Start: 482
• Page End: 491
• Publication Date: 2019-05-30
• Subjects: Nano-sized additives -- Graphene nanoplatelets -- Cementitious materials -- Piezoresistance -- Damage detection; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2019.03.036
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Within the elastic regime, the resistivity drops as the compression increasing. The resistivity reaction can match well with the damage developing process. The damage calculated with resistivity can arrive 0.8 at last. Abstract: Pilot researches prove that graphene nanoplatelets (GNPs) are promising nano-sized additives to improve the smartness of cementitious materials. This work aims to reveal the explicit correlation between the damage development and the resistivity reaction of cementitious composites infilled with GNPs. A weight content of 4.5% (GNPs/cement) is used to cast two groups of concrete samples, named as C20 and C30 (according to their designed compressive strength), whose volume fractions of GNPs are 0.43% and 0.61%, respectively. Investigations shows different failure patterns during compression loading and their piezoresistive characteristics are probed systematically. Additionally, damages determined by strain-stress curves and ultrasonic pulse velocity penetrations in the middle section are also studied for comparing. The damage evolution process illustrated by resistivity reactions contains a slight decrease of resistivity within the elastic regime, a moderate damage developing stage before the peak force, an expeditive damage section just after the peak force and a relaxed damage expanding when the stress drops to less than 50% of the strength. At last, the damages obtained with resistivities increase to 0.8. This indicates that the piezoresistivity of smart concrete containing GNPs can be a promising tool to detect damages detailedly.