Effects of high temperature on the microstructure and mechanical behavior of hard coal
Coal is a common porous sedimentary rock whose microstructure and mechanical behavior are often affected by high temperature. In order to deeply investigate the effect of high temperature on the structure and mechanical properties of coal, six groups of coal samples with different heating temperatur...
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doaj-66d3a4f72f1a4fd8ad6ce7185398cd942020-11-25T02:50:27ZengElsevierInternational Journal of Mining Science and Technology2095-26862020-09-01305643650Effects of high temperature on the microstructure and mechanical behavior of hard coalChengdong Su0Jiadong Qiu1Qiuhong Wu2Lei Weng3School of Energy Science and Engineering, Collaborative Innovation Center of Coal Work Safety, Henan Polytechnic University, Jiaozuo 454003, ChinaKey Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring (Central South University), Ministry of Education, Changsha 410083, China; Corresponding author.Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines, Hunan Provincial Key Laboratory of Safe Mining, Xiangtan 411201, ChinaSchool of Civil Engineering, Wuhan University, Wuhan 430072, ChinaCoal is a common porous sedimentary rock whose microstructure and mechanical behavior are often affected by high temperature. In order to deeply investigate the effect of high temperature on the structure and mechanical properties of coal, six groups of coal samples with different heating temperatures were prepared. Various testing methods, including ultrasonic test, scanning electron microscopy, nuclear magnetic resonance and uniaxial compression test, were used in this study. The results showed that the physical and chemical change processes of coal samples under high temperature can be divided into two stages: the stage of drying and degassing and the stage of pyrolysis of the coal matrix. With the increase of heating temperature, the total porosity of coal samples increases, while the integrity and the deformation resistance of coal samples decrease. In addition, the elastic modulus and uniaxial compressive strength of the coal sample decrease with the increase of heating temperature. The Poisson’s ratio decreases firstly and then increases with the increase of heating temperature.http://www.sciencedirect.com/science/article/pii/S2095268620300409High temperatureCoalMicrostructureMechanical behaviorNuclear magnetic resonance |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Chengdong Su Jiadong Qiu Qiuhong Wu Lei Weng |
spellingShingle |
Chengdong Su Jiadong Qiu Qiuhong Wu Lei Weng Effects of high temperature on the microstructure and mechanical behavior of hard coal International Journal of Mining Science and Technology High temperature Coal Microstructure Mechanical behavior Nuclear magnetic resonance |
author_facet |
Chengdong Su Jiadong Qiu Qiuhong Wu Lei Weng |
author_sort |
Chengdong Su |
title |
Effects of high temperature on the microstructure and mechanical behavior of hard coal |
title_short |
Effects of high temperature on the microstructure and mechanical behavior of hard coal |
title_full |
Effects of high temperature on the microstructure and mechanical behavior of hard coal |
title_fullStr |
Effects of high temperature on the microstructure and mechanical behavior of hard coal |
title_full_unstemmed |
Effects of high temperature on the microstructure and mechanical behavior of hard coal |
title_sort |
effects of high temperature on the microstructure and mechanical behavior of hard coal |
publisher |
Elsevier |
series |
International Journal of Mining Science and Technology |
issn |
2095-2686 |
publishDate |
2020-09-01 |
description |
Coal is a common porous sedimentary rock whose microstructure and mechanical behavior are often affected by high temperature. In order to deeply investigate the effect of high temperature on the structure and mechanical properties of coal, six groups of coal samples with different heating temperatures were prepared. Various testing methods, including ultrasonic test, scanning electron microscopy, nuclear magnetic resonance and uniaxial compression test, were used in this study. The results showed that the physical and chemical change processes of coal samples under high temperature can be divided into two stages: the stage of drying and degassing and the stage of pyrolysis of the coal matrix. With the increase of heating temperature, the total porosity of coal samples increases, while the integrity and the deformation resistance of coal samples decrease. In addition, the elastic modulus and uniaxial compressive strength of the coal sample decrease with the increase of heating temperature. The Poisson’s ratio decreases firstly and then increases with the increase of heating temperature. |
topic |
High temperature Coal Microstructure Mechanical behavior Nuclear magnetic resonance |
url |
http://www.sciencedirect.com/science/article/pii/S2095268620300409 |
work_keys_str_mv |
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