Abstract
Soundless chemical demolition agents (SCDAs) have been used during the last decades in the demolition of boulders and concrete structures as well as in open-surface and sub-surface rock excavation, as an alternative to the use of explosives posing safety risks. However, the knowledge of the governing fracture mechanisms in brittle materials is rather limited. In the present work, we thoroughly investigate the use of the acoustic emission technique to study the SCDA-induced fracture process in concrete blocks. Energy-related features and waveform parameters of the recorded AE activity are correlated to the fracture mode of the concrete where a quasi-static behavior is observed. Monitoring of the progressive fracture is also achieved by the 3D localization of the AE sources. The distribution of the inter-event times of the recorded hits is further analyzed in the context of non-extensive statistical physics.
Highlights
Soundless chemical demolition agents (SCDAs) have been used during the last decades in the demolition of boulders and concrete structures as well as in open-surface and sub-surface rock excavation, as an effective alternative to the use of explosives posing safety risks [1,2,3,4,5]
I n the present work, the fracturing process of concrete specimens under the effect of a soundless chemical demolition agent was investigated by using the acoustic emission (AE) technique
Real-time monitoring of a concrete block with a pre-drilled hole filled with SCDA was performed for a period of 24 h by an array of 7 AE sensors
Summary
Soundless chemical demolition agents (SCDAs) have been used during the last decades in the demolition of boulders and concrete structures as well as in open-surface and sub-surface rock excavation, as an effective alternative to the use of explosives posing safety risks [1,2,3,4,5]. In addition to commercial use, non-explosive expansion material has been utilized in laboratory experiments to evaluate its fracturing capacity of synthetic specimens, and its potential application for fracturing coal roofs in coal mines has been proposed [8]. Quasi-static conditions can be considered in SCDA-induced rock fracturing, due to the observed stable crack propagation at low crack velocities, and micro-crack based sliding models are likely to be applied [5]. In this direction, the well-established monitoring technique of AE can provide valuable information on the fracture mechanisms in rocks and concrete structures under the effect of SCDAs [12,13,14]. The experimental data are analyzed using parameter-based and statistical methodologies of acoustic emissions
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