Influence of thermal damage on the physical and mechanical properties of carbonate rocks

Sengün, N.

doi:10.1007/s12517-013-1177-x

Cited by 69 publications

(33 citation statements)

References 18 publications

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“…Chakrabarti 1993;Chakrabarti et al 1995;Hajpál 2002), while others have concentrated on physical and mechanical properties (e.g. Brotóns et al 2013;Franzoni et al 2013;Tian et al 2014;Sengun 2014;Ozguven and Ozcelik 2014). The present study focusses on changes in the physical and mechanical properties of Persepolis stone subjected experimentally to high temperatures.…”

Section: Introductionmentioning

confidence: 94%

“…Consequently, the structure and mineral composition of the rocks can change drastically, and, in turn, physical and mechanical properties may change as well. Temperature alone can vitally influence the microstructure of rocks (Sengun 2014). Significant changes in temperature, particularly high temperatures (up to several 100°C), play an important role in the behaviour of stone.…”

Section: Introductionmentioning

confidence: 99%

“…A dramatic reduction of the mechanical properties in response to the increase in heating was also reported. Sengun (2014) studied the influence of temperatures ranging from 105°C to 600°C on physical and mechanical properties of six carbonate rocks. He found that the values of bulk density, P wave velocity, uniaxial compressive strength, modulus of elasticity, Brazilian tensile strength (BTS) and Shore hardness decreased to different extents after heating to 600°C.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Artificial weathering assessment of Persepolis stone due to heating to elucidate the effects of the burning of Persepolis

Heidari

Torabi-Kaveh

Mohseni

2016

Bull Eng Geol Environ

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Historic buildings can suffer from the effects of fire due to either accident or warfare. Temperature increases due to fire play an important role in the degradation of monument stones. This article presents the results of research dealing with the effect of fire and high temperature on limestone as the principal construction stone of the Persepolis complex. This study tries to convince the relevant authorities to protect the already fire-weathered stones against further damage. The physical and mechanical properties of Persepolis stone (in the saturated and dried state) were studied under various temperatures ranging from 20°C to 600°C. Observations revealed changes in colour and cracking development, which are thought to be the effects of heat on this stone. Decomposition of organic matter is probably the main factor responsible for the colour changes in the specimens as it is most prominent above 400°C. Cracks grew preferentially along the crude lamination rich in clay minerals. Furthermore, the density of the specimens decreases with increasing temperature, while their porosity increases slightly when they are heated to 200°C and above. Up to 0.57 and 0.92 % mass losses were also observed in the dried and saturated specimens, respectively, when the specimens were heated to 600°C. This negligible mass loss could be attributed to the low porosity of the specimens. Both point load strength index (I s50 ) and Brazilian tensile strength values of the specimens increased at temperature of 20-600°C. This is probably due to closure of the original cracks/voids as a consequence of clay mineral recrystallisation after heating. Although the Burning of Persepolis created some cracks in the Persepolis stones, it increased their inherent strength.

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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Artificial weathering assessment of Persepolis stone due to heating to elucidate the effects of the burning of Persepolis

Heidari

Torabi-Kaveh

Mohseni

2016

Bull Eng Geol Environ

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“…They also mentioned that natural stones that face this amount of heat under atmospheric conditions generally, crack, fragmentize, spall, and disperse. Sengun (2014) investigated the influence of temperatures ranging from 105°C to 600°C on the physical and mechanical properties of six carbonate rock samples (two marbles, two low-porous limestones, and two high-porous limestones). It was found that the values of bulk density, P-wave velocity, uniaxial compressive strength and modulus of elasticity, tensile strength, and shore hardness decreased to different extents, whereas apparent porosity increased under the influence of heat up to 600°C.…”

Section: Introductionmentioning

confidence: 99%

Thermal Effects on Compressive Strength of Local Limestone and Claystone

Ibrahim

Ismail

Omar

2017

ARO

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Abstract-Limestone and claystone are widely used in rocky mountainous areas as building materials in Kurdistan region, in particular, the city of Koya. The outbreak of fire in buildings will have a great impact on strengths of building materials. The property performance of these local materials is understudied. This research investigates the impact of high temperature on the physicomechanical properties of limestone and claystone from Fatha Formation in Koya in Kurdistan region of Iraq. For this purpose, cores were taken from intact rocks; their ends were cut by a mechanical saw to obtain a cylindrical shape and immersed in water for 24 h, and then, subjected to physicomechanical tests of specific gravity, water absorption, porosity, and uniaxial compressive strength. For determining the residual compressive strength, the specimens were taken out from water, surface dried, and exposed to high temperatures of 450, and 650°C for 2 h using an electric oven. The results showed that claystone specimens show more stable mechanical properties than the limestone after exposure to high temperatures, and the high temperature causes lightening in color and significant cracks in both materials.

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“…In extant literature, the investigation of the effects of temperature on physical and mechanical properties mainly emphasize the bulk density, P-and S-wave velocity, uniaxial and triaxial strength, modulus of elasticity, Brazilian tensile strength, and Shore hardness [8]. Progressive damage and failure of rock is a continuous process of energy exchange between host rock and its surroundings.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of mechanical properties and energy features of granite after heat treatment under different loading paths

Zhang

Kang

2017

Teh. vjesn.

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EXPERIMENTAL INVESTIGATION OF MECHANICAL PROPERTIES AND ENERGY FEATURES OF GRANITE AFTER HEAT TREATMENT UNDER DIFFERENT LOADING PATHSJunwen Zhang, Xu Chen, Hengyi KangOriginal scientific paper Temperature and loading history are the two main factors that influence rock microstructure and physical and mechanical properties. To explore the influence of heat treatment and loading path on mechanical properties and energy features of granite, granite samples were first heat-treated at 25 °C, 300 °C, 600 °C, and 900 °C. Then, 12 groups of triaxial compression experiments were placed under three loading paths, as follows: uniaxial compression, conventional triaxial compression, and confining pressure unloading. Mechanical properties and energy features in the deformation and failure process based on these experimental results were systematically compared and analyzed. Results demonstrate that Young's modulus, uniaxial compressive strength, and triaxial compressive strength increased in the temperature range of 25 °C to 300 °C, but decreased in the temperature range of 300 °C to 900 °C. Under the same loading path, the gaps among total absorbed energy, dissipated energy, and elastic strain energy widened with increasing temperature from 25 °C to 900 °C. At the same temperature, the energy features' gap under confining pressure unloading is between uniaxial and triaxial compression. The conclusions drawn in this study provide a significant reference for the design and construction of rock engineering exposed to high temperature. Keywords: energy features; heat treatment; loading paths; triaxial compression Eksperimentalno ispitivanje mehaničkih svojstava i energetskih svojstava granita nakon toplinske obrade pri različitom načinu opterećenjaIzvorni znanstveni članak Povijest temperature i opterećenja dva su glavna čimbenika koji utječu na mikrostrukturu stijene i fizikalna i mehanička svojstva. Da bi se istražio utjecaj toplinske obrade i opterećenja na mehanička svojstva i energetske značajke granita, uzorci granita najprije su toplinski obrađeni na 25 °C, 300 °C, 600 °C i 900° C. Zatim je 12 skupina eksperimenata troosnog sabijanja podvrgnuto opterećenju na tri načina, kako slijedi: jednoosno sabijanje, konvencionalno troosno sabijanje i ograničeno tlačno rasterećenje. Sustavno se uspoređuju i analiziraju mehanička svojstva i značajke energije u procesu deformacije i oštećenja na temelju tih eksperimentalnih rezultata. Rezultati pokazuju da su Youngov modul, jednoosna tlačna čvrstoća i troosna tlačna čvrstoća porasli u temperaturnom području od 25 °C do 300 °C, ali su se smanjili u temperaturnom području od 300 °C do 900 °C. Pod istim načinima opterećenja, razlike između ukupne apsorbirane energije, raspršene energije i elastične energije naprezanja povećale su se s porastom temperature od 25 °C do 900 °C. Pri istoj temperaturi, razlika između energetskih značajki pod rasterećenjem ograničenim tlakom je između jednoosnog i troosnog sabijanja. Zaključci izneseni u ovoj studiji pružaju značajnu referencu za projektiranje...

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Influence of thermal damage on the physical and mechanical properties of carbonate rocks

Cited by 69 publications

References 18 publications

Artificial weathering assessment of Persepolis stone due to heating to elucidate the effects of the burning of Persepolis

Artificial weathering assessment of Persepolis stone due to heating to elucidate the effects of the burning of Persepolis

Thermal Effects on Compressive Strength of Local Limestone and Claystone

Experimental investigation of mechanical properties and energy features of granite after heat treatment under different loading paths

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