| Title |
Damage Estimate of High Performance Fiber-Reinforced Cementitious Composites in Compression and Flexure Using Acoustic Emission |
| Keywords |
HPFRCCs ; Micro Fracture Mechanism ; AE Signal ; Kaiser Effect |
| Abstract |
High performance fiber-reinforced cementitious composite (HPFRCC) shows the multiple crack and damage tolerance capacity due to the interfacial bonding of the fibers to the cement matrix. For effective material design and application of HPFRCC, it is needed to investigate the damage process and micro-fracture mechanism of cement matrix reinforced with different types of fibers. The objective of this paper is to investigate the flexural/compressive fracture of cement composites reinforced with single and hybrid fibers to examine their compressive behavior, fracture behavior, and the progress of damage in HPFRCC using the AE technique, and to establish the connection between the acoustic activity and the development of any damage. In this study, the correlations between acoustic emission (AE) signal and flexural/compressive fracture characteristics of HPFRCC (PVA1.5%, PE1.5%, SC0.75%+PE0.75%) under monotonic and cyclic uniaxial compressive were studied. The test results showed that HPFRCC with hybrid fiber have high strength and can maintain its peak stress to large strains. And from AE signal value, it is found that the second and third compressive load cycle resulted in successive decrease of the amplitude as compared with the first compressive load cycle. Also, the Kaiser effect existed in HPFRCC specimens up to 50% of its ultimate strength. These observations suggest that the AE Kaiser effect has potential for use as a new tool to monitor the loading history of HPFRCC. |