Experimental Research on Acoustic Emission Characteristics of High Performance Concrete Beam with Nano SiO2
- DOI
- 10.2991/iceep-17.2017.235How to use a DOI?
- Keywords
- High performance concrete;Mechanical properties;Acoustic emission;3D positioning;initial cracking point
- Abstract
Variations in the acoustic emission parameters of normal concrete (NC), steel fiber reinforced concrete (SFRC), and nano SiO₂ fiber concrete (NSFC) with the increase in loads under four-point bending load were studied. Distribution law of acoustic emission signals and its correlations with flexural strength and breaking energy of the concrete were discussed. The energy jump of acoustic emission (AE) signals reflects abrupt changes in the load and displacement of specimens. The first change point on the time of arrival (TOA)-energy curve corresponds to the load and displacement of the initial cracking point of the load-displacement curve. Nano SiO₂ significantly enhances the strength of AE signals, thereby prolonging the duration of an AE event. An extended AE event is conducive to accurately determining the initial cracking point. Compared with steel fiber-reinforced concrete (SFRC), nano SiO₂ steel fiber-reinforced concrete (NSFC) exhibits greater toughness and bending strength. The addition of nano SiO₂ leads to a more stable AE test result, which is beneficial for identifying the initial cracking point and critical failure point of a concrete beam, determining the initial load and ultimate bearing capacity of the beam, and providing an early warning against possible structural failures.
- Copyright
- © 2017, the Authors. Published by Atlantis Press.
- Open Access
- This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).
Cite this article
TY - CONF AU - Lan Yan AU - Yongming Xinga AU - Zhanyun Gao PY - 2017/06 DA - 2017/06 TI - Experimental Research on Acoustic Emission Characteristics of High Performance Concrete Beam with Nano SiO2 BT - Proceedings of the 2017 6th International Conference on Energy and Environmental Protection (ICEEP 2017) PB - Atlantis Press SP - 1335 EP - 1342 SN - 2352-5401 UR - https://doi.org/10.2991/iceep-17.2017.235 DO - 10.2991/iceep-17.2017.235 ID - Yan2017/06 ER -