矿用注浆材料的宏细观跨尺度孔隙结构特征（英文）
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摘要
采取薄层断面分析和低场核磁共振(NMR)技术对3种矿用注浆材料的微观孔隙结构和孔隙率进行表征,通过图像二值化和随机行走孔隙谱维数(RWPSD)算法研究注浆材料的宏观孔隙特征——孔隙贯通性。实验结果表明:研究所用注浆材料的微观结构由层间孔、胶凝孔、毛细孔、圆形气孔和微裂缝组成。尾矿可以充填在水化产物结构中的孔隙内,使水化产物更加致密。孔隙贯通性与养护时间呈正相关,且与孔隙率之间存在一定规律。随着孔隙率和孔隙贯通性的增加,添加了速凝剂的注浆材料产生不均匀孔隙结构,使材料的凝结时间缩短、后期强度降低。
The pore structure and porosity of three kinds of mine grouting materials were characterized based on a thin-section analysis and low-field nuclear magnetic resonance(NMR) technique. The macroscopic pore interconnectivity was investigated using binary images captured from thin sections and a random walk pore spectral dimension(RWPSD) algorithm. The experimental results show that the microstructure of the grouting materials used consisted of interlayer pores, gel pores, capillary pores, circular air holes, and small fractures, and tailings can fill some gaps in the hydration product structure and dense hydration products. There is a positive correlation between pore interconnectivity and curing time. In addition, there is a relationship between pore interconnectivity and porosity. With increasing porosity and pore interconnectivity, a non-uniform pore structure occurs in mine grouting materials with an accelerator and results in reduced setting time and later strength.
The pore structure and porosity of three kinds of mine grouting materials were characterized based on a thin-section analysis and low-field nuclear magnetic resonance(NMR) technique. The macroscopic pore interconnectivity was investigated using binary images captured from thin sections and a random walk pore spectral dimension(RWPSD) algorithm. The experimental results show that the microstructure of the grouting materials used consisted of interlayer pores, gel pores, capillary pores, circular air holes, and small fractures, and tailings can fill some gaps in the hydration product structure and dense hydration products. There is a positive correlation between pore interconnectivity and curing time. In addition, there is a relationship between pore interconnectivity and porosity. With increasing porosity and pore interconnectivity, a non-uniform pore structure occurs in mine grouting materials with an accelerator and results in reduced setting time and later strength.
引文
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[20]CHEN Yong-ping,SHI Ming-heng.Determination of permeability for porous media using fractal theory[J].Journal of Tsinghua University,2000,40(12):94-97.
[21]LI Jie-lin,LIU Han-wen,AI Kai-ming,ZHU Long-yin.An NMR-based experimental study on the pore structure of the hydration process of mine filling slurry[J].Advances in Civil Engineering,2018,2018:1-12.
[22]JI Yan-liang,SUN Zhen-ping,JIANG Xiao-xing,LIU Yi,SHUILiang-liang,CHEN Chao.Fractal characterization on pore structure and analysis of fluidity and bleeding of fresh cement paste based on1 H low-field NMR[J].Construction and Building Materials,2017,140:445-453.
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[27]OUELLET S,BUSSIERE B,AUBERTIN M,BENZAAZOUA M.Characterization of cemented paste backfill pore structure using SEMand IA analysis[J].Bulletin of Engineering Geology and the Environment,2008,67(2):139-152.
[28]GAO Ru-gao,ZHOU Ke-ping,LI Jie-lin.Research of the mechanisms of backfill formation and damage[J].Materiali in Tehnologije,2017,52(2):163-169.
[29]ZHOU Ke-ping,GAO Ru-gao,GAO Feng.Particle flow characteristics and transportation optimization of superfine unclassified backfilling[J].Mineral,2017,7(1):6-27.
[30]QI Chong-chong,FOURIE A,CHEN Qiu-song,TANG Xiao-lin,ZHANG Qin-li,GAO Ru-gao.Data-driven modelling of the flocculation process on mineral processing tailings treatment[J].Journal of Cleaner Production,2018,196:505-516.
[31]MANGAT P S,OJEDOKUN O O.Influence of curing on pore properties and strength of alkali activated mortars[J].Construction and Building Materials,2018,188:337-348.
[32]SANTOS A R,VEIGA M D,SILVA A S,DE BRITO J,ALVAREZ JI.Evolution of the microstructure of lime based mortars and influence on the mechanical behaviour:The role of the aggregates[J].Construction and Building materials,2018,187:907-922.
[2]LI Gong-yu,ZHOU Wan-fang.Impact of karst water on coal mining in North China[J].Environmental Geology,2006,49(3):449-457.
[3]SAKHAEE-POUR A,BRYANT S L.Effect of pore structure on the producibility of tight-gas sandstones[J].AAPG Bulletin,2014,98(4):663-694.
[4]FOURMENTIN M,FAURE P,RODTS S,PETER U,LESUEUR D,DAVILLER D,COUSSOT P.NMR observation of water transfer between a cement paste and a porous medium[J].Cement and Concrete Research,2017,95:56-64.
[5]ZUNINO F,BENTZ D P,CASTRO J.Reducing setting time of blended cement paste containing high-SO3 fly ash(HSFA)using chemical/physical accelerators and by fly ash pre-washing[J].Cement and Concrete Composition,2018,90:14-26.
[6]MALTESE C,PISTOLESI C,BRAVO A,CELLA F,CERULLI T,SALVIONI D.A case history:Effect of moisture on the setting behaviour of a Portland cement reacting with an alkali-free accelerator[J].Cement and Concrete Research,2007,37(6):856-865.
[7]HIGGS K E,ZWINGMANN H,REYES A G,FUNNELL R H.Diagenesis,porosity evolution,and petroleum emplacement in tight gas reservoirs,Taranaki Basin,New Zealand[J].Journal of Sedimentary Research,2007,77(12):1003-1025.
[8]WANG Xiao-hua,LI Jin-shan,HU Rui,KOU Hong-chao.Mechanical properties and pore structure deformation behaviour of biomedical porous titanium[J].Transactions of Nonferrous Metals Society of China,2014,24(3):833-838.
[9]YANG Bao-hua,WU Ai-xiang,MIAO Xiu-xiu,LIU Jin-zhi.3Dcharacterization and analysis of pore structure of packed ore particle beds based on computed tomography images[J].Transactions of Nonferrous Metals Society of China,2015,25(5):1543-1550.
[10]SHANG Jun-long,HU Jian-hua,ZHOU Ke-ping,LUO Xian-wei,ALIYU M.Porosity increment and strength degradation of low-porosity sedimentary rocks under different loading conditions[J].International Journal of Rock Mechanics and Mining Sciences,2015,75:216-223.
[11]SUN Xiao,ZHANG Bin,DAI Qing-li,YU Xiong.Investigation of internal curing effects on microstructure and permeability of interface transition zones in cement mortar with SEM imaging,transport simulation and hydration modeling techniques[J].Construction and Building Materials,2015,76:366-379.
[12]FAVVAS E P,SAPALIDIS A A,STEFANOPOULOS K L,ROMANOS G E,KANELLOPOULOS N K,KARGIOT IS E K,MITROPOULOS A C.Characterization of carbonate rocks by combination of scattering,porosimetry and permeability techniques[J].Microporous and Mesoporous Materials,2009,120(1):109-114.
[13]HU Jian-hua,REN Qi-fan,JIANG Quan,GAO Ru-gao,ZHANGLong,LUO Zhou-quan.Strength characteristics and the reaction mechanism of stone powder cement tailings backfill[J].Advances in Materials Science and Engineering,2018,2018:1-14.
[14]YAO Yan-Bin,LIU Da-Meng.Comparison of low-field NMR and mercury intrusion porosimetry in characterizing pore size distributions of coals[J].Fuel,2012,95:152-158.
[15]YANG Bao-hua,WU Ai-xiang,WANG Chun-lai,NIU Wen-xin,LIUJin-zhi.Three-dimensional simulation of pore scale fluid flow in granular ore media with realistic geometry[J].Transactions of Nonferrous Metals Society of China,2012,22(12):3081-3086.
[16]MIZUSAWA K.Polarizing microscope observations of pottery from the Yashiro sites,Nagano Prefecture,Central Japan[J].Quaternary International,2016,397:495-503.
[17]ZHOU San-dong,LIU Da-meng,CAI Yi-dong,YAO Yan-bin.Fractal characterization of pore-fracture in low-rank coals using a low-field NMR relaxation method[J].Fuel,2016,181:218-226.
[18]YAO Yan-bin,LIU Da-meng,CHE Yao,TANG Da-zhen,TANGShu-heng,HUANG Wen-hui.Petrophysical characterrization of coals by low-field nuclear magnetic resonance(NMR)[J].Fuel,2010,89:1371-1380.
[19]XU You-wei.Application of directional random walk algorithm based on fractal method in the research of heat transfer in porous media[D].Yangzhou:Yangzhou University,2014.(in Chinese)
[20]CHEN Yong-ping,SHI Ming-heng.Determination of permeability for porous media using fractal theory[J].Journal of Tsinghua University,2000,40(12):94-97.
[21]LI Jie-lin,LIU Han-wen,AI Kai-ming,ZHU Long-yin.An NMR-based experimental study on the pore structure of the hydration process of mine filling slurry[J].Advances in Civil Engineering,2018,2018:1-12.
[22]JI Yan-liang,SUN Zhen-ping,JIANG Xiao-xing,LIU Yi,SHUILiang-liang,CHEN Chao.Fractal characterization on pore structure and analysis of fluidity and bleeding of fresh cement paste based on1 H low-field NMR[J].Construction and Building Materials,2017,140:445-453.
[23]MEHTA P K,MONTEIRO P J M.Concrete:microstructure,properties,and materials[M].2nd ed.New York:McGraw-Hill,1993.
[24]JEHNG J.Microstructure of wet cement pastes:A nuclear magnetic resonance study[D].Evanston:Northwestern University,USA,1995.
[25]DAVY C A,ADLER P M.Three-scale analysis of the permeability of a natural shale[J].Physical Review,2017,96:1-12.
[26]OUELLET S,BUSSIERE B,AUBERTIN M,BENZAAZOUA M.Microstructural evolution of cemented paste backfill:Mercury intrusion porosimetry test results[J].Cement and Concrete Research,2007,37(12):1654-1665.
[27]OUELLET S,BUSSIERE B,AUBERTIN M,BENZAAZOUA M.Characterization of cemented paste backfill pore structure using SEMand IA analysis[J].Bulletin of Engineering Geology and the Environment,2008,67(2):139-152.
[28]GAO Ru-gao,ZHOU Ke-ping,LI Jie-lin.Research of the mechanisms of backfill formation and damage[J].Materiali in Tehnologije,2017,52(2):163-169.
[29]ZHOU Ke-ping,GAO Ru-gao,GAO Feng.Particle flow characteristics and transportation optimization of superfine unclassified backfilling[J].Mineral,2017,7(1):6-27.
[30]QI Chong-chong,FOURIE A,CHEN Qiu-song,TANG Xiao-lin,ZHANG Qin-li,GAO Ru-gao.Data-driven modelling of the flocculation process on mineral processing tailings treatment[J].Journal of Cleaner Production,2018,196:505-516.
[31]MANGAT P S,OJEDOKUN O O.Influence of curing on pore properties and strength of alkali activated mortars[J].Construction and Building Materials,2018,188:337-348.
[32]SANTOS A R,VEIGA M D,SILVA A S,DE BRITO J,ALVAREZ JI.Evolution of the microstructure of lime based mortars and influence on the mechanical behaviour:The role of the aggregates[J].Construction and Building materials,2018,187:907-922.
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