Creep Acoustic Emission Characterization of Perlite Lightweight Concrete

DOI

10.2991/978-94-6463-856-1_2How to use a DOI?

Keywords

concrete; perlite; graded creep; acoustic emission; damage characterization

Abstract

Perlite lightweight concrete has been extensively utilized in building structures. However, during its usage, the long-term loading on the building structure leads to a deterioration of the mechanical properties of perlite lightweight concrete and significantly impacts the durability of the building. Therefore, in order to investigate the creep properties and acoustic emission characteristics of perlite lightweight concrete under different stress levels, a real-time monitoring test was conducted on stepwise loaded perlite modified concrete to analyze the pattern of axial deformation changes. The evolution characteristics of creep damage were examined based on acoustic emission parameters, and the AE b-value characteristics during different creep stages were investigated. The test results demonstrate that before reaching five levels of creep loading curve, perlite lightweight concrete mainly exhibits decelerated creep and isotonic creep; however, in the last stage of creep damage after experiencing decelerated creep directly transitions into accelerated creep. The instantaneous strain exponentially increases with each loading level, while the rate of decelerated creep is positively correlated with stress level. The counts and amplitude of acoustic emission ringing are more active during the decelerated creep and accelerated creep stages. In the first three stages of isokinetic creep, there is a sparse number of acoustic emissions, while in the last two stages, there is a significant increase. The b value of acoustic emission shows an upward trend in the first three levels of creep loading process, followed by small fluctuations in the b value during the deceleration stage of creep loading. At 80% compressive strength during isokinetic creep late stage, there is a sudden reduction in b value indicating non-stable state development for the sample. During the final loading damage stage, there are intensive fluctuations and variations in b-value suggesting impending specimen destabilization and damage. Acoustic emission b-value can effectively reflect the expansion process of cracks in perlite lightweight concrete under creep conditions and provide precursor warning information for its destruction.

Copyright

© 2025 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

Download article (PDF)

TY  - CONF
AU  - Qiang Li
AU  - Tianzuo Cai
AU  - Shengjie Zhao
AU  - Yongjun Song
PY  - 2025
DA  - 2025/09/22
TI  - Creep Acoustic Emission Characterization of Perlite Lightweight Concrete
BT  - Proceedings of the 2025 International Conference on Resilient City and Safety Engineering (ICRCSE 2025)
PB  - Atlantis Press
SP  - 4
EP  - 16
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6463-856-1_2
DO  - 10.2991/978-94-6463-856-1_2
ID  - Li2025
ER  -