An influence of thermally-induced micro-cracking under cooling treatments: mechanical characteristics of Australian granite

Article


Isaka, Badulla Liyanage Avanthi, Ranjith, Pathegama Gamage, Rathnaweera, Tharaka Dilanka, Perera, Mandadige Samintha Anne, Chandrasekharam, Dornadula and Kumari, Wanniarachchige Gnamani Pabasara. 2018. "An influence of thermally-induced micro-cracking under cooling treatments: mechanical characteristics of Australian granite." Energies. 11 (6), pp. 1-24. https://doi.org/10.3390/en11061338
Article Title

An influence of thermally-induced micro-cracking under cooling treatments: mechanical characteristics of Australian granite

ERA Journal ID123161
Article CategoryArticle
AuthorsIsaka, Badulla Liyanage Avanthi (Author), Ranjith, Pathegama Gamage (Author), Rathnaweera, Tharaka Dilanka (Author), Perera, Mandadige Samintha Anne (Author), Chandrasekharam, Dornadula (Author) and Kumari, Wanniarachchige Gnamani Pabasara (Author)
Journal TitleEnergies
Journal Citation11 (6), pp. 1-24
Article Number1338
Number of Pages24
Year2018
PublisherMDPI AG
Place of PublicationBasel, Switzerland
ISSN1996-1073
Digital Object Identifier (DOI)https://doi.org/10.3390/en11061338
Web Address (URL)https://www.mdpi.com/1996-1073/11/6/1338
Abstract

The aim of this study is to characterise the changes in mechanical properties and to provide a comprehensive micro-structural analysis of Harcourt granite over different pre-heating temperatures under two cooling treatments (1) rapid and (2) slow cooling. A series of uniaxial compression tests was conducted to evaluate the mechanical properties of granite specimens subjected to pre-heating to temperatures ranging from 25–1000◦C under both cooling conditions. An acoustic emission (AE) system was incorporated to identify the fracture propagation stress thresholds. Furthermore, the effect of loading and unloading behaviour on the elastic properties of Harcourt granite was evaluated at two locations prior to failure: (1) crack initiation and (2) crack damage. Scanning electron microscopy (SEM) analyses were conducted on heat-treated thin rock slices to observe the crack/fracture patterns and to quantify the extent of micro-cracking during intense heating followed by cooling. The results revealed that the thermal field induced in the Harcourt granite pore structure during heating up to 100◦C followed by cooling causes cracks to close, resulting in increased mechanical characteristics, in particular, material stiffness and strength. Thereafter, a decline in mechanical properties occurs with the increase of pre-heating temperatures from 100◦C to 800◦C. However, the thermal deterioration under rapid cooling is much higher than that under slow cooling, because rapid cooling appears to produce a significant amount of micro-cracking due to the irreversible thermal shock induced. Multiple stages of loading and unloading prior to failure degrade the elastic properties of Harcourt granite due to the damage accumulated through the coalescence of micro-cracks induced during compression loading. However, this degradation is insignificant for pre-heating temperatures over 400◦C, since the specimens are already damaged due to excessive thermal deterioration. Moreover, unloading after crack initiation tends to cause insignificant irreversible strains, whereas significant permanent strains occur during unloading after crack damage, and this appears to increase with the increase of pre-heating temperature over 400◦C. © 2018 by the authors.

Keywordsacoustic emission; cooling; granite; high temperature; loading; mechanical properties; microstructural analysis; unloading; acoustic emissions; compression testing; concrete aggregates; crack initiation; cracks; deterioration; elasticity; heating; scanning electron microscopy; compression loading; fracture propagation; irreversible strain; loading and unloading; mechanical characteristics; uni-axial compression tests; acoustic emission testing
ANZSRC Field of Research 2020401902. Geomechanics and resources geotechnical engineering
Byline AffiliationsMonash University
Indian Institute of Technology, India
Institution of OriginUniversity of Southern Queensland
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