Variations of Strength, Resistivity and Thermal Parameters of Clay after High Temperature Treatment

Sun, Qiang; Zhang, Weiqiang; Zhang, Yuliang; Yang, Lining

doi:10.1515/acgeo-2016-0090

Cited by 11 publications

(10 citation statements)

References 24 publications

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“…Figure 2(b) presents the permeability of granite which increased sharply around 500°C. is observation was in accordance with the evolution of total porosity at this temperature [80][81][82][83][84][85].…”

Section: Porosity and Permeability Evolution Depending On Thesupporting

confidence: 89%

“…At 898°C, the author of [43] showed that the decarbonisation was completed and caused a breakdown of the aggregates. (6) Clay minerals and phyllo silicate were more sensitive to heat and showed severe transformations at high temperature [46]. In this category of minerals, we found the alteration of silicates minerals (feldspars, for example) such as kaolinite, sericite, and illite.…”

Section: Influence Of Temperature On Mineralogical Compositionmentioning

confidence: 81%

“…Similarly, considering carbonate rocks, micrite has a low cracking rate at 100°C compared with marble [58] which undergoes very high cracking rates. Sun et al [82] used the pressure gradient from Darcy's law to experimentally determine the permeability of the heat-treated material in accordance with ISRM Norm. In their work, it appeared that using a containment pressure between 10 MPa and 30 MPa, equivalent permeability (K 0 � A × 1.01 T ) decreased by about 91.06%, previously predicted with a critical temperature of T � 400°C.…”

Section: Porosity and Permeability Evolution Depending On Thementioning

confidence: 99%

“…et al, 2016)[36] Granite(Chaki et al, 2008) [75] Gneiss(Mambou et al, 2017) [76] Granite(He et al, 2018) [82] Clay [83] Granite(Xu et al, 2008) [84] (a) Porosity of gneiss, granite, and clay with temperature. (b) Permeability of granite depending on temperature[75].…”

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confidence: 99%

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Experimental and Theoretical Investigations of Hard Rocks at High Temperature: Applications in Civil Engineering

Leroy

Marius

Nicolas

2021

Advances in Civil Engineering

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This review paper aims to survey and discuss recent theoretical and experimental works reporting the temperature effects on the mechanical properties of rocks like granite, gabbro, gneiss, marble, sandstone, basalt, limestone, and argillite to permit the new challenge in this domain. The effect of high temperatures on various mechanical and physical material properties (Young’s modulus, porosity, tensile and compressive strengths, P-wave velocity, permeability, thermal damage, and expansion) is analyzed. This work shows that hard rock mechanical and physical properties evolutions are strongly related to the evolution of the microstructure caused by the geological history, cracks nucleation occurrences, recrystallization, dehydroxylation, and dehydration reactions. However, it should be emphasized that these studies were not conducted on all types of intrusions and all rocks types. Meanwhile, it has been noticed that variations in temperature could lead to contradictory phenomena. Therefore, different trends were observed for the evolution of physical properties of rocks. There is an increase in porosity approximately 80% above 500°C. In general, for volcanic’s rock, the loss mass and thermal conductivity were drastically observed at low temperatures around 200°C with an antinomic phenomenon. Sandstone, granite, and argillite present the model whose behaviors with thermal load are too much explored accordingly with experiments compared with other rocks. Argillite at 200°C and sandstone and granite at 400°C undergo seriously damage. There is 100°C gap between the results obtained in real-time and those obtained after cooling. Moreover, 300°C can be considered as the critical temperature for real-time temperature heat treatment at which rocks lose almost about 80% of their performance. Otherwise, it is not easy to predict the behavior at high temperature of volcanic rocks like basalt and metamorphic rocks like gneiss which present the complexity in their behavior. For plutonic and metamorphic rocks, 600°C is the critical thermal load. At this temperature, the modulus of elasticity as well as the compressive strength of the most explored rock shows a significant decrease of about 75% for hard rocks. In sum, high temperature damages significantly the mechanical performance of rock. It is the reason for which these results may be useful to characterize the damage and thus predict the dramatic consequences of large temperature fluctuations on engineering structures in the rock.

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Section: Porosity and Permeability Evolution Depending On Thesupporting

confidence: 89%

Section: Influence Of Temperature On Mineralogical Compositionmentioning

confidence: 81%

Section: Porosity and Permeability Evolution Depending On Thementioning

confidence: 99%

mentioning

confidence: 99%

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Experimental and Theoretical Investigations of Hard Rocks at High Temperature: Applications in Civil Engineering

Leroy

Marius

Nicolas

2021

Advances in Civil Engineering

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“…The main temperature‐dependent properties required for thermal simulations are thermal conductivity, specific heat capacity, and bulk density. Several researches have investigated the thermophysical properties of various soils, clay, and limestone 9,10 . However, these materials are different from the plasters used in buildings.…”

Section: Introductionmentioning

confidence: 99%

Material properties of clay and lime plaster for structural fire design

et al. 2019

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Summary Clay and lime plaster are traditional surface finish materials used on historic timber walls and ceilings. Today, hardly any fire technical properties or design parameters exist that consider such plasters as fire protection materials for timber structures. This hinders the fire assessment of existing building structures and disadvantages their use in modern design solutions where healthy and sustainable materials are increasingly favoured. This research follows the safety philosophy of EN 1995‐1‐2 to describe the fire protection ability of plasters. This paper investigates the temperature‐dependent thermal properties of historic plasters by presenting series of material‐specific tests and furnace tests carried out under standard fire exposure conditions. Experimental studies are supported by numerical heat transfer simulations. Results demonstrate particularities between the fire protection ability of clay and lime plaster, however, highlight the need for further investigations in terms of their thermophysical performance and standardisation at the European level. Design parameters are presented and discussed in future perspective. This work demonstrates a basic research to plan and design full‐scale fire tests according to EN 13381‐7:2019.

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Response of thermal conductivity of loess after high temperature in northern Shaanxi burnt rock area, China

Wang

Sun

et al. 2022

Environ Sci Pollut Res

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Variations of Strength, Resistivity and Thermal Parameters of Clay after High Temperature Treatment

Cited by 11 publications

References 24 publications

Experimental and Theoretical Investigations of Hard Rocks at High Temperature: Applications in Civil Engineering

Experimental and Theoretical Investigations of Hard Rocks at High Temperature: Applications in Civil Engineering

Material properties of clay and lime plaster for structural fire design

Response of thermal conductivity of loess after high temperature in northern Shaanxi burnt rock area, China

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