Tensile characterization of graphene nanoplatelets (GNP) mortar using acoustic emissions

被引：21
作者：
Jiang, Zhangfan [1 ]
Sherif, Muhammad M. [2 ]
Xing, Guohua [3 ]
Ozbulut, Osman E. [1 ]
机构：
[1] Univ Virginia, Dept Engn Syst & Environm, Charlottesville, VA 22901 USA
[2] Univ Alabama Birmingham, Dept Civil Construct & Environm Engn, Birmingham, AL 35294 USA
[3] Changan Univ, Sch Civil Engn, Xian, Peoples R China
来源：
MATERIALS TODAY COMMUNICATIONS | 2020年 / 25卷
关键词：
Cementitious composites; Graphene nanoplatelets; Tensile strength; Acoustic emission; FIBER-REINFORCED MORTAR; B-VALUE ANALYSIS; PIEZORESISTIVE PROPERTIES; CEMENT MORTAR; CONCRETE BEAM; DAMAGE; CLASSIFICATION; IDENTIFICATION; PERFORMANCE; COMPOSITES;
D O I：
10.1016/j.mtcomm.2020.101433
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
This study characterizes tensile behavior of graphene nanoplatelets (GNPs) reinforced cementitious composites using acoustic emissions (AE). Two acoustic sensors were attached to dog-bone specimens that were cast using GNP nanoreinforced mortar composites at concentration levels of 0% to 0.5 % by weight of cement. The specimens were tested under direct tensile loading and the average tensile strength was calculated. AE parameters such as average frequency (AF) and rise time over amplitude (RA) were used to analyze the cracking mode. Average RA was studied to investigate the effect of GNPs reinforcement. A correlation between average acoustic energy and the tensile strength was established. In addition, the acoustic emissions data was analyzed for the localization of cracks along the length of the specimens. Results indicated that the addition of GNPs increased the tensile strength of the cementitious composites by 8%-48%. In addition, the AE analysis revealed a delay in crack initiation shear stress transfer on the matrix -GNPs interface for mortar composites with GNPs and was able to localize cracks as they are initiated.
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页数：9
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