Acoustic Emission behavior of thermally damaged Self-Compacting High Strength Fiber Reinforced Concrete. (30th October 2018)

• Record Type: Journal Article
• Authors: Xargay, Hernán; Folino, Paula; Nuñez, Nicolás; Gómez, Martín; Caggiano, Antonio; Martinelli, Enzo
• Is Part Of: Construction & building materials. Volume 187(2018)
• Page Start: 519
• Page End: 530
• Publication Date: 2018-10-30
• Subjects: Acoustic Emission -- Self-Compacting -- High-Strength Concrete -- Fiber-Reinforced Concrete -- High temperature; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2018.07.156
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: High temperature effects were investigated on SC-High Strength and Fiber-Reinforced Concrete. Steel fibers played a beneficial role in bridging the expansion of heat-induced cracks. Acoustic Emission (AE) measurements allow scrutinizing thermal damages in cementitious composites. AE activity was monitored for analyzing bridging fiber mechanisms in SCHSFRC. Abstract: This paper investigates the effect of high temperature on two different Self-Compacting (SC) cementitious composites. SC-High Strength (SCHSC) and Fiber-Reinforced Concrete (SCHSFRC) samples were tested in three-point bending after having been exposed to high temperature at 300 and 600 °C. Besides the conventional force-displacement response, Acoustic Emission (AE) activity was monitored during the bending tests with the aim to investigate the possible correlation between the fracture behavior, the rate of AEs and the influence of high temperature exposure. The tests clearly pointed out the effects of heat exposure. More specifically, SCHSC specimens showed a significant decay in mechanical properties as a result of thermal treatments. Then, a lower degradation was observed for the SCHSFRC after heat exposure at 300 °C, whereas the specimens exposed to 600 °C exhibited a tougher response than the corresponding SCHSC. The results showed that the effect of fibers played a beneficial role in bridging the expansion of heat-induced cracks developed in the concrete matrix during the exposure of specimens at high temperature. This bridging effect of fibers was observed also in terms of the AE activity: much less AE events were systematically registered for SCHSFRC specimens with respect to SCHSC ones, for a given value of the imposed Crack-Mouth-Opening-Displacement (CMOD). Therefore, AE measurements confirm their potential in scrutinizing the damage level in cementitious composites.