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...

Full description

Bibliographic Details
Main Authors: Chengdong Su, Jiadong Qiu, Qiuhong Wu, Lei Weng
Format: Article
Language:English
Published: Elsevier 2020-09-01
Series:International Journal of Mining Science and Technology
Subjects:
Online Access:http://www.sciencedirect.com/science/article/pii/S2095268620300409
id doaj-66d3a4f72f1a4fd8ad6ce7185398cd94
record_format Article
spelling 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 AT chengdongsu effectsofhightemperatureonthemicrostructureandmechanicalbehaviorofhardcoal
AT jiadongqiu effectsofhightemperatureonthemicrostructureandmechanicalbehaviorofhardcoal
AT qiuhongwu effectsofhightemperatureonthemicrostructureandmechanicalbehaviorofhardcoal
AT leiweng effectsofhightemperatureonthemicrostructureandmechanicalbehaviorofhardcoal
_version_ 1724738494048239616