碱-盐复合激发煤气化粗渣的水泥胶砂强度特性
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摘要
采用扫描电子显微镜(SEM)、能谱仪(EDS)和X射线衍射仪(XRD)分析了煤气化粗渣的微观结构、元素分布及物相组成;优选碱-盐复合激发剂,制备了掺煤气化粗渣水泥胶砂试件,分析了碱-盐激发剂对胶砂抗压、抗折强度的影响,并探讨了碱-盐激发下煤气化粗渣水泥胶凝硬化产物的微观结构和物相组成。结果表明:煤气化粗渣以层片状、不规则粒状颗粒居多,富含C、O、Si、Al、Ca、Fe等元素,存在火山灰活性的硅氧、铝氧或铝-硅-氧相;复合激发效果优于各自单掺的激发效果,其中掺硫酸钙与氢氧化钠组合激发效果最佳;激发剂有助于发挥煤气化粗渣的火山灰活性,促进煤气化粗渣水泥胶凝体系中水化产物的生成,提升了胶凝材料的结构强度。
In order to explore the utilization of coal gasification coarse slag in concrete,the microstructure,element distribution and phase composition of coal gasification coarse slag were characterized conventionally.Subsequently,the suitable alkali-salt compound activators were selected to prepare the cement mortar involving coarse slag,and the influences of alkali-salt compound activator on the compressive and flexural strength of the mortar were then analyzed.Simultaneously,the microstructure and phase composition of the hydration products of the slag and the cement activated with the alkali-salt were detected.The results show that the slag,rich in C,O,Si,Al,Ca,Fe,are mainly composed of lamellar and irregular granular particles.Besides,there exist active Si-O,Al-O or Al-Si-O phases in the coarse slag.It is also found that the effect of compound activation is better than separateness,and the combination of calcium sulfate and sodium hydroxide has optimal effect.The addition of activators can promote the formation of the hydration products,and then enhance the mortar strength because the activators can effectively facilitate the pozzolanic reaction of slag.
In order to explore the utilization of coal gasification coarse slag in concrete,the microstructure,element distribution and phase composition of coal gasification coarse slag were characterized conventionally.Subsequently,the suitable alkali-salt compound activators were selected to prepare the cement mortar involving coarse slag,and the influences of alkali-salt compound activator on the compressive and flexural strength of the mortar were then analyzed.Simultaneously,the microstructure and phase composition of the hydration products of the slag and the cement activated with the alkali-salt were detected.The results show that the slag,rich in C,O,Si,Al,Ca,Fe,are mainly composed of lamellar and irregular granular particles.Besides,there exist active Si-O,Al-O or Al-Si-O phases in the coarse slag.It is also found that the effect of compound activation is better than separateness,and the combination of calcium sulfate and sodium hydroxide has optimal effect.The addition of activators can promote the formation of the hydration products,and then enhance the mortar strength because the activators can effectively facilitate the pozzolanic reaction of slag.
引文
[1]蒋敏华,黄斌.燃煤发电技术发展展望[J].中国电机工程学报,2012,32(29):1~8;39.
[2]许慎启.煤气化反应动力学及渣中残碳反应活性研究[D].上海:华东理工大学,2011.
[3]王辅臣,于广锁,龚欣,刘海峰,王亦飞,梁钦峰.大型煤气化技术的研究与发展[J].化工进展,2009,28(2):173~180.
[4]Yoshitaka Ishikawa.Utilization of Coal Gasification Slag Collected from IGCC as Fine Aggregate for Concrete[C].EUROCOALASH 2012 Conference,Thessaloniki GREECE,September 2012.Eurocoalash 2012 Conference Book of Abstracts,2012:1~11.
[5]杨帅,石立军.煤气化细渣组分分析及其综合利用探讨[J].煤化工,2013,41(4):29~31;38.
[6]赵永彬,吴辉,蔡晓亮,等.煤气化残渣的基本特性研究[J].洁净煤技术,2015,21(3):110~113;74.
[7]Itaru HORIGUCHI,Atsushi SHIRAI,Masaru WATANABE,et al.Fundamental Study on Concrete With Coal Gasification Slag[J].Cement Science and Concrete Technology,2012(66):615~621.
[8]Radosaw Pomykaa.The Mechanical Properties of Coal Gasification Slag as a Component of Concrete and Binding Mixtures[J].Polish Journal of Environmental Studies,2014,23(4):1403~1406.
[9]刘开平,赵红艳,李祖仲,等.煤气化渣对水泥混凝土性能的影响[J].建筑科学与工程学报,2017,34(5):190~195.
[10]刘仍光,苗霞,丁士东,等.掺矿渣复合水泥基材料硬化浆体中Ca(OH)2含量的变化规律[J].材料科学与工程学报,2017,35(1):1~4.
[11]王朝强,谭克锋,黎泽明,等.粉煤灰基灌浆材料的制备及性能[J].材料科学与工程学报,2013,31(6):919~923+906.
[12]姜正平,明维.碱激发矿渣蒸压混凝土中钢筋早期锈蚀状况[J/OL].建筑材料学报:1~9[2017-06-30].http://kns.cnki.net/kcms/detail/31.1764.TU.20170630.1058.014.html.
[13]廖明辉,刘开帝.碱激发高钙粉煤灰地质聚合物的强度特性[J].硅酸盐通报,2015,34(8):2167~2170,2176.
[14]《公路工程集料试验规程》[S].JTG E42-2005.
[15]《水泥胶砂强度检验方法(ISO法)》[S].GB/T 17671-1999.
[16]王恩.煤粉炉粉煤灰与循环流化床粉煤灰矿物学性质比较[J].洁净煤技术,2016,22(4):26~29.
[17]Xianglong Zhao,Cai Zeng,Yanyan Mao,et al.The surface Characteristics and Residual Carbon in Coal Gasification Slag[J].Energy&Fuels,2010(24):91~94.
[18]TANG Yun,YIN Hongfeng,REN Yun,et al.Prepartion of Sialon Powder from Coal Gasification Slag[J].Journal of Wuhan University of Technology-Materials Science,2010,25(6):1044~1046.
[19]封孝信,冯乃谦.水泥及混凝土中的有害碱与无害碱[J].混凝土,2000(10):3~7.
[20]E.Douglas,J.Brandstetr.A Preliminary Study on the Alkali Activation of Ground Granulated Blast-furnace Slag[J].Cement and Concrete Research,1990,20(5):746~756.
[21]邱轶兵,王庆平.Na2SO4激发粉煤灰火山灰活性研究[J].材料导报,2013,27(24):121~124.
[22]蔺喜强,王栋民,许晨阳,等.硫酸盐类及氯盐类激发剂对粉煤灰活性的影响[J].粉煤灰,2012,24(1):4~7.
[2]许慎启.煤气化反应动力学及渣中残碳反应活性研究[D].上海:华东理工大学,2011.
[3]王辅臣,于广锁,龚欣,刘海峰,王亦飞,梁钦峰.大型煤气化技术的研究与发展[J].化工进展,2009,28(2):173~180.
[4]Yoshitaka Ishikawa.Utilization of Coal Gasification Slag Collected from IGCC as Fine Aggregate for Concrete[C].EUROCOALASH 2012 Conference,Thessaloniki GREECE,September 2012.Eurocoalash 2012 Conference Book of Abstracts,2012:1~11.
[5]杨帅,石立军.煤气化细渣组分分析及其综合利用探讨[J].煤化工,2013,41(4):29~31;38.
[6]赵永彬,吴辉,蔡晓亮,等.煤气化残渣的基本特性研究[J].洁净煤技术,2015,21(3):110~113;74.
[7]Itaru HORIGUCHI,Atsushi SHIRAI,Masaru WATANABE,et al.Fundamental Study on Concrete With Coal Gasification Slag[J].Cement Science and Concrete Technology,2012(66):615~621.
[8]Radosaw Pomykaa.The Mechanical Properties of Coal Gasification Slag as a Component of Concrete and Binding Mixtures[J].Polish Journal of Environmental Studies,2014,23(4):1403~1406.
[9]刘开平,赵红艳,李祖仲,等.煤气化渣对水泥混凝土性能的影响[J].建筑科学与工程学报,2017,34(5):190~195.
[10]刘仍光,苗霞,丁士东,等.掺矿渣复合水泥基材料硬化浆体中Ca(OH)2含量的变化规律[J].材料科学与工程学报,2017,35(1):1~4.
[11]王朝强,谭克锋,黎泽明,等.粉煤灰基灌浆材料的制备及性能[J].材料科学与工程学报,2013,31(6):919~923+906.
[12]姜正平,明维.碱激发矿渣蒸压混凝土中钢筋早期锈蚀状况[J/OL].建筑材料学报:1~9[2017-06-30].http://kns.cnki.net/kcms/detail/31.1764.TU.20170630.1058.014.html.
[13]廖明辉,刘开帝.碱激发高钙粉煤灰地质聚合物的强度特性[J].硅酸盐通报,2015,34(8):2167~2170,2176.
[14]《公路工程集料试验规程》[S].JTG E42-2005.
[15]《水泥胶砂强度检验方法(ISO法)》[S].GB/T 17671-1999.
[16]王恩.煤粉炉粉煤灰与循环流化床粉煤灰矿物学性质比较[J].洁净煤技术,2016,22(4):26~29.
[17]Xianglong Zhao,Cai Zeng,Yanyan Mao,et al.The surface Characteristics and Residual Carbon in Coal Gasification Slag[J].Energy&Fuels,2010(24):91~94.
[18]TANG Yun,YIN Hongfeng,REN Yun,et al.Prepartion of Sialon Powder from Coal Gasification Slag[J].Journal of Wuhan University of Technology-Materials Science,2010,25(6):1044~1046.
[19]封孝信,冯乃谦.水泥及混凝土中的有害碱与无害碱[J].混凝土,2000(10):3~7.
[20]E.Douglas,J.Brandstetr.A Preliminary Study on the Alkali Activation of Ground Granulated Blast-furnace Slag[J].Cement and Concrete Research,1990,20(5):746~756.
[21]邱轶兵,王庆平.Na2SO4激发粉煤灰火山灰活性研究[J].材料导报,2013,27(24):121~124.
[22]蔺喜强,王栋民,许晨阳,等.硫酸盐类及氯盐类激发剂对粉煤灰活性的影响[J].粉煤灰,2012,24(1):4~7.
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