Acoustic emission characteristics and damage model of cement mortar under uniaxial compression. (20th July 2019)

• Record Type: Journal Article
• Authors: Gu, Qingheng; Ma, Qing; Tan, Yunliang; Jia, Zhichuang; Zhao, Zenghui; Huang, Dongmei
• Is Part Of: Construction & building materials. Volume 213(2019)
• Page Start: 377
• Page End: 385
• Publication Date: 2019-07-20
• Subjects: Cement mortar -- Strength and deformation characteristics -- AE characteristics -- Damage model -- Loading rates; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2019.04.090
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: A statistical damage evolution equation was modified by introducing the concept of critical damage. The statistical damage evolution equation can be fitted by using AE energy data. A statistical damage constitutive model of cement mortar considering the critical damage and cracks compaction was developed. Abstract: Cement mortar is a widely used construction material; its mechanical behaviour is affected by the proportion of its contents and external loads. Its health condition and damage evolution can be obtained by acoustic emission (AE) monitoring. In this study, uniaxial compression and AE synchronisation tests under different loading rates for cement mortar with different cement sand ratios are carried out. Considering that the specimen still has a certain bearing capacity after failure, the concept of critical damage was introduced to modify the statistical damage evolution equation, and the damage evolution equation was fitted by using AE energy data. Finally, a statistical damage constitutive model of cement mortar considering the compaction effect of cracks was developed, and the fitted results of the models were compared to experimental data. Results showed that the critical damage value of cement mortar is approximately 0.9, and the damage constitutive model under uniaxial compression can accurately describe the relationship between strength and deformation of cement mortar with different cement sand ratios and loading rates.