Influence of thermal damage on physical properties of a granite rock: Porosity, permeability and ultrasonic wave evolutions

Chaki, S.; Takarli, Mokhfi; Agbodjan, William Prince

doi:10.1016/j.conbuildmat.2007.04.002

Cited by 433 publications

(154 citation statements)

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“…The model predicted the Electrical Resistivity (ER) of soil-cement, under certain conditions of curing time and the Water/Cement ratio (w/c); it was found that the ER and the values of the compressive strength (f'c) of the material in study are closely correlated. Numerous investigations have been conducted in order to use the Ultra Sound Pulse Velocity technique(UPV) for predicting the mechanical properties of concrete and rocks, e.g., Chaki et al (Chaki, Takarli, & Agbodjan, 2008) found a linear correlation between spectra amplitude of UPV signals and the amount of heat-induced damage to granites; meanwhile Wu & Lin, and Selleck et al (Wu & T.F., 1998;Selleck, Landis, Peterson, Shah, & Achenbach, 1998) investigated the behavior of UPV associated with the damage of concrete, the results showed that the wave velocity of mortar specimens at the stress-free state decreases with the decreasing of w/c ratios.…”

Section: Introductionmentioning

confidence: 99%

Prediction of the Static Modulus of Elasticity Using Four non Destructive Testing

Chávez-García

Alonso-Guzmán

Martínez-Molina

et al. 2014

Revista de la Construcción

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The static modulus of elasticity (Es) is an important parameter in the analysis of hydraulic concrete structures, changes have been made to the regulation of construction; these changes require minimum values for the Es, so now, in addition to concrete compressive strength (f´c) also Es values should be ensured. A methodology to predict Es is proposed, specifically, the Es were modeled by testing: ultrasonic pulse velocity (UPV), electrical resistivity test (ERT), resonance frequency test (RFT), the Hammer Test Rebound (HTR) and f´c. In order to generate models multiple linear regression technique was used. Cylindrical specimens were prepared in two stages, in the first stage was simulated laboratory conditions in the second stage was simulated conditions of concrete made in situ. All cylinders were subjected to non-destructive and destructive tests at different ages. The research objective is to predict Es from the results of destructive tests (traditionally employed to obtain Es) and nondestructive testing. It was possible to obtain a model whose correlation coefficient indicates the good approximation in the generated predictions. ResumenEl módulo estático de elasticidad (Es) es un parámetro importante en el análisis de las estructuras de concreto hidráulico, se han realizado cambios en la regulación de la construcción; estos cambios requieren valores mínimos de los Es, por lo que ahora, además de la resistencia a la compresión del concreto (f'c) también deben garantizarse valores de Es. Se propone una metodología para predecir Es, específicamente, los Es fueron modelados con las pruebas: velocidad de pulso ultrasónico (UPV), prueba de resistividad eléctrica (ERT), prueba de frecuencia de resonancia (RFT), prueba de rebote de martillo (HTR) y f'c. Se utilizó la técnica de regresión lineal múltiple para generar los modelos. Se elaboraron especímenes cilíndricos en dos etapas, la primera simulando condiciones de laboratorio y en la segunda simulando condiciones de concreto hecho en campo. Todos los cilindros se sometieron a pruebas no destructivas y destructivas a diferentes edades. El objetivo de la investigación es predecir Es con los resultados obtenidos de pruebas destructivas (empleadas tradicionalmente para obtener Es) y pruebas no destructivas. Fue posible obtener un modelo cuyo coeficiente de correlación indica la buena aproximación en las predicciones generadas.Palabras clave: Concreto hidráulico, Modulo de Elasticidad Estático, Modulo de Elasticidad Dinámico, Prueba no Destructivas, Resistencia a la compresión.

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Section: Introductionmentioning

confidence: 99%

Prediction of the Static Modulus of Elasticity Using Four non Destructive Testing

Chávez-García

Alonso-Guzmán

Martínez-Molina

et al. 2014

Revista de la Construcción

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“…Porosity is one of the basic physical properties of rock (Table 2) [8]. It can be defined by the ratio of void volume to the total volume of the rock.…”

Section: Porositymentioning

confidence: 99%

“…All these experimental works are focus on sandstone [4][5][6][7], granite [1,[8][9][10], carbonates [2] and gabbro [11]. However, few studies are interested on the gneiss rock microscopic analysis of thin section of the heated specimen.…”

Section: Introductionmentioning

confidence: 99%

“…Many experimental studies have been conducted on different rocks, [1][2][3][4][5][6][7][8][9][10][11][12][13][14] with an objective to observe and explain the behavior of physical and mechanical properties of these rocks under high temperature or after thermal treatment. All these experimental works are focus on sandstone [4][5][6][7], granite [1,[8][9][10], carbonates [2] and gabbro [11].…”

Section: Introductionmentioning

confidence: 99%

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Investigations of Thermal Damage on the Physical and Mechanical Properties of Gneiss Rock Specimen

NM¹

2017

J Powder Metall Min

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The effect of thermal damage on the physical and mechanical properties of gneiss has been experimentally investigated. The cylindrical samples prepared from this rock were gradually heated to a specific temperature level of 100, 200, 300, 400, 500, 700, and 900°C and gradually cooled down to room temperature without causing thermal cracking in order to investigate the effect of thermal treatment on physical properties and mechanical properties. The mechanical tests conducted on the sample were the Brazilian test and the uniaxial compressive test. Microscopic analyses from thin section were done to better understand the reasons for the mechanical behavior observed from the mechanical test results. Our study confirms that the thermal treatment reduces the strength of gneiss and increases its porosity. Moreover, it is found that above 600°C of heating, gneiss rock specimens can loss 80% of its original mechanical performances. This is due to a micro crack network connection and their propagation. However between 300 and 400°C we observe an increase in the strength of gneiss. Microscopic examination shows the abundance of feldspar and pyroxene minerals in the gneiss, which in turn show high mineralogical phase changes at 300-400°C compared to change at temperatures above 400°C.

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“…The results obtained by these researchers showed that microfractures can be observed as early as when the temperature value exceeds 80°C, and they can subsequently join together, forming structures that are macroscopic in their nature. Chaki et al (2008), in their study of the impact of an increase of temperature to the value of 600ºC on selected properties of granite rocks, introduce the notion of "thermal damage", i.e. a significant increase in the number of fractures resulting from changes in the rock temperature.…”

Section: Introductionmentioning

confidence: 99%

Changes of Selected Structural and Mechanical Properties of the Strzelin Granites As Induced By Thermal Loads / Wpływ Obciążeń Termicznych Na Zmiany Niektórych Strukturalnych I Mechanicznych Właściwości Granitów Strzelińskich

Nowakowski¹,

Młynarczuk²

2012

Archives of Mining Sciences

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Temperature is one of the basic factors influencing physical and structural properties of rocks. A quantitative and qualitative description of this influence becomes essential in underground construction and, in particular, in the construction of various underground storage facilities, including nuclear waste repositories. The present paper discusses the effects of temperature changes on selected mechanical and structural parameters of the Strzelin granites. Its authors focused on analyzing the changes of granite properties that accompany rapid temperature changes, for temperatures lower than 573ºC, which is the value at which the β -α phase transition in quartz occurs. Some of the criteria for selecting the temperature range were the results of measurements carried out at nuclear waste repositories. It was demonstrated that, as a result of the adopted procedure of heating and cooling of samples, the examined rock starts to reveal measurable structural changes, which, in turn, induces vital changes of its selected mechanical properties. In particular, it was shown that one of the quantities describing the structure of the rock -namely, the fracture network -grew significantly. As a consequence, vital changes could be observed in the following physical quantities characterizing the rock: primary wave velocity (v p ), permeability coefficient (k), total porosity (n) and fracture porosity (η), limit of compressive strength ( R σ 1 ) and the accompanying deformation ( R ε 1 ), Young's modulus (E), and Poisson's ratio (ν).Keywords: rock properties, rock structure, thermal load, cracks, sound wave velocity, porosity, permeability, compressive strength, Young modulus, Poisson ratio Wśród wielu czynników wpływających na właściwości fizyczne i strukturalne skał jednym z najważniejszych jest bez wątpienia temperatura. Jej podwyższenie lub obniżenie może prowadzić do zmian struktury, spowodować przemiany fazowe składników, zmieniać skład chemiczny a wreszcie, stan skupienia skały. Procesy te mogą więc w istotny sposób zmienić właściwości fizyczne skały, co jest istotne między innymi z punktu widzenia szeroko rozumianego budownictwa podziemnego. Zmiany temperatury skały mogą wynikać z warunków naturalnych, w jakich się ona znajduje lub być konsekwencją działalności człowieka. Szczególnym przypadkiem takiej działalności jest budowa różnego typu składowisk pod-

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Influence of thermal damage on physical properties of a granite rock: Porosity, permeability and ultrasonic wave evolutions

Cited by 433 publications

References 11 publications

Prediction of the Static Modulus of Elasticity Using Four non Destructive Testing

Prediction of the Static Modulus of Elasticity Using Four non Destructive Testing

Investigations of Thermal Damage on the Physical and Mechanical Properties of Gneiss Rock Specimen

Changes of Selected Structural and Mechanical Properties of the Strzelin Granites As Induced By Thermal Loads / Wpływ Obciążeń Termicznych Na Zmiany Niektórych Strukturalnych I Mechanicznych Właściwości Granitów Strzelińskich

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