Thermal alterations in the poro-mechanical characteristic of an Indian sandstone – A comparative study

Sirdesai, Nikhil; Singh, T. N.; Gamage, Ranjith Pathegama

doi:10.1016/j.enggeo.2017.06.010

Cited by 87 publications

(17 citation statements)

References 33 publications

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“…The long-term weathering properties of the rocks can be analysed by the repeat of the weathering effects such as freeze-thaw cycles of sulfate crystallisation tests. Thermal stresses can also reduce durability of granites (Vázquez et al 2016; Freire-Lista and Fort 2017) sandstone (Sirdesai et al 2017) and other lithologies, such as limestone (Brotóns et al 2013) or marble (Martinho and Dionísio 2018). Akin and Özsan (2011) studied the mechanical and physical parameters of a Turkish travertine exposing cubic tests specimens to 80 cycles of freezing-thawing and 25 cycles of sulfate crystallization tests, while Jamshidi et al 2016 made similar tests on Gerdoee travertine from Iran.…”

Section: Discussionmentioning

confidence: 99%

Effects of long-term magnesium sulfate crystallisation tests on abrasion and durability of andesite aggregates

Czinder

Török

2019

Bull Eng Geol Environ

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The durability of aggregates against salt weathering is calculated after five cycles of immersion in a magnesium sulfate solution followed by drying according to the relevant European standard (EN 1367-2: 2010). The aim of the study is to investigate the long-term durability of aggregates by increasing the number of cycles of the salt crystallization test from the standardized five to a maximum of 35. Three andesite types from Hungarian quarries were tested representing three different localities. The weight loss of the specimens was determined after every 5-cycle set. Results were documented for three size-fractions 10.0/11.2 mm, 11.2/ 14.0 mm and the 10.0/14.0 mm, respectively. Relationships between immersion-drying cycles and magnesium sulfate values were described by the Pearson-coefficient. According to the test results, the magnesium sulfate values followed linearly increasing tendencies in the course of the long-term salt crystallization tests. Parallel to the salt-weathering tests, the changes in the mechanical properties of the salt-attacked aggregates were also detected by micro-Deval tests (EN 1097-1: 2012). The changes in micro-Deval coefficients were calculated in the form of a decay factor as a function of sulfate cycles. The results suggest that the micro-Deval coefficient does not rise after a certain salt cycle; i.e. higher number of salt-crystallisation cycles does not necessarily reduce the micro-Deval coefficient of studied andesite lithologies.

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Section: Discussionmentioning

confidence: 99%

Effects of long-term magnesium sulfate crystallisation tests on abrasion and durability of andesite aggregates

Czinder

Török

2019

Bull Eng Geol Environ

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“…To minimize the effect of water on coal, the samples were dried in a vacuumed oven at 70 • C for two days before performing the gas adsorption-desorption and permeability tests. It is preferable to dry samples at lower temperatures for a longer time rather than at a high temperature for a shorter time because cracks or mineral alterations can occur at high temperatures [26]. To reduce the discreteness of the test data, three samples of coal, which have no macroscopic cracks, are of similar quality and have uniform features during CT scanning, were selected for the experiments.…”

Section: Experimental Methodsmentioning

confidence: 99%

Coal Anisotropic Sorption and Permeability: An Experimental Study

Chen

2018

Processes

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Knowledge of the bedding plane properties of coal seams is essential for the coalbed gas production because of their great influence on the inner flow characteristics and sorption features of gas and water. In this study, an experimental study on the anisotropic gas adsorption–desorption and permeability of coal is presented. The results show that during the adsorption–desorption process, an increase in the bedding plane angle of the specimen expands the length and area of the contact surface, thereby increasing the speed and quantity of adsorption and desorption. With an increase in the bedding angle, the number of pores and cracks was found to increase together with the volumetric strain. The evolution of permeability of coal heavily depended on stress–strain stages. The permeability decreased with the increase of stress at the initial compaction and elastic deformation stages, while it increased with the increase of stress at the stages of strain-hardening, softening and residual strength. Initial permeability increased with increasing bedding angle.

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“…Li et al [8] proposed to use colorimetry as a simple but effective method to assess fire damage of rocks. The hardness is found to generally weaken as the temperature applied to the rocks is gradually increased [9][10][11][12]. Similarly, with an increase in the applied temperature, the P-wave velocity showed a decreasing trend [13][14][15].…”

Section: Introductionmentioning

confidence: 95%

Comparison of Mechanical Behavior and Acoustic Emission Characteristics of Three Thermally-Damaged Rocks

Peng

Yang

2018

Energies

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High temperature treatment has a significant influence on the mechanical behavior and the associated microcracking characteristic of rocks. A good understanding of the thermal damage effects on rock behavior is helpful for design and stability evaluation of engineering structures in the geothermal field. This paper studies the mechanical behavior and the acoustic emission (AE) characteristic of three typical rocks (i.e., sedimentary, metamorphic, and igneous), with an emphasis on how the difference in rock type (i.e., porosity and mineralogical composition) affects the rock behavior in response to thermal damage. Compression tests are carried out on rock specimens which are thermally damaged and AE monitoring is conducted during the compression tests. The mechanical properties including P-wave velocity, compressive strength, and Young’s modulus for the three rocks are found to generally show a decreasing trend as the temperature applied to the rock increases. However, these mechanical properties for quartz sandstone first increase to a certain extent and then decrease as the treatment temperature increases, which is mainly attributed to the high porosity of quartz sandstone. The results obtained from stress–strain curve, failure mode, and AE characteristic also show that the failure of quartz-rich rock (i.e., quartz sandstone and granite) is more brittle when compared with that of calcite-rich rock (i.e., marble). However, the ductility is enhanced to some extent as the treatment temperature increases for all the three examined rocks. Due to high brittleness of quartz sandstone and granite, more AE activities can be detected during loading and the recorded AE activities mostly accumulate when the stress approaches the peak strength, which is quite different from the results of marble.

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Thermal alterations in the poro-mechanical characteristic of an Indian sandstone – A comparative study

Cited by 87 publications

References 33 publications

Effects of long-term magnesium sulfate crystallisation tests on abrasion and durability of andesite aggregates

Effects of long-term magnesium sulfate crystallisation tests on abrasion and durability of andesite aggregates

Coal Anisotropic Sorption and Permeability: An Experimental Study

Comparison of Mechanical Behavior and Acoustic Emission Characteristics of Three Thermally-Damaged Rocks

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