玄武岩纤维混凝土抗压强度分析与微观表征
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摘要
采用现场试验、电镜扫描(SEM)及数值模拟相结合的方法来研究玄武岩纤维对混凝土抗压强度的影响机制。通过混凝土抗压试验探究不同龄期下纤维掺量和纤维长度对混凝土抗压强度的影响,及采用电镜扫描对玄武岩纤维混凝土(BFRC)的微观结构进行机理分析。在细观尺度上采用Mori-Tanaka均化算法和连续介质渐进损伤理论建立混凝土损伤力学模型,研究不同纤维掺量和纤维长度的耦合作用对混凝土抗压强度的影响,并将试验和数值模拟结果进行对比与分析,验证其模型的可行性。结果表明:玄武岩纤维的掺入能够改善混凝土的抗压性能,纤维长度为6 mm的效果较佳;通过电镜扫描发现,纤维的"抱团"现象和纤维–界面之间的薄弱层不利于混凝土抗压强度的提升,但纤维的阻裂效应使得混凝土整体结构的抗压强度有所增加;试验与数值模拟结果具有良好的一致性。
This paper reports a study on basalt fiber reinforced concrete(BFRC) combining field test, scanning electron microscope(SEM), and numerical simulation, focusing on the mechanism of basalt fiber influencing concrete compressive strength. The influence of fiber content and fiber length is experimentally observed by conducting compressive tests on samples at different ages, and its SEM data are used to analyze the microstructure. We develop a mechanics model of concrete damage at the microscopic level based on the Mori-Tanaka algorithm and the progressive damage theory of continuous medium, and use it to examine the coupling effect of different fiber contents and different fiber lengths on the compressive strength. To verify its feasibility, the simulation results are compared with our experimental measurements and both agree well. The results show that adding basalt fiber to concrete improves compressive strength and the fiber length of 6 mm is better. SEM images show that the phenomenon of fiber adhering and the weak layer between the fiber and the interface have an adverse effect on compressive strength, but the resistance of fiber against cracking leads to a considerable increase in compressive strength.
This paper reports a study on basalt fiber reinforced concrete(BFRC) combining field test, scanning electron microscope(SEM), and numerical simulation, focusing on the mechanism of basalt fiber influencing concrete compressive strength. The influence of fiber content and fiber length is experimentally observed by conducting compressive tests on samples at different ages, and its SEM data are used to analyze the microstructure. We develop a mechanics model of concrete damage at the microscopic level based on the Mori-Tanaka algorithm and the progressive damage theory of continuous medium, and use it to examine the coupling effect of different fiber contents and different fiber lengths on the compressive strength. To verify its feasibility, the simulation results are compared with our experimental measurements and both agree well. The results show that adding basalt fiber to concrete improves compressive strength and the fiber length of 6 mm is better. SEM images show that the phenomenon of fiber adhering and the weak layer between the fiber and the interface have an adverse effect on compressive strength, but the resistance of fiber against cracking leads to a considerable increase in compressive strength.
引文
[1]郭樟根,陈晨,范秉杰.再生粗细骨料混凝土基本力学性能试验研究[J].建筑结构学报,2016,37(S2):94-102.GUO Zhanggen,CHEN Chen,FAN Bingjie.Experimental research on mechanical behavior of concrete made of coarse and fine recycled aggregates[J].Journal of Building Structures,2016,37(S2):94-102.(in Chinese)
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[6]邱庆莉,洪叶南,李海光,等.聚丙烯纤维硅粉混凝土强度与早期抗裂性能试验[J].科技通报,2016,32(4):187-191.QIU Qingli,HONG Yenan,LI Haiguang,et al.Strength and early crack resistance experiment of polypropylene fiber reinforced concrete with silicon powder[J].Bulletin of Science&Technology,2016,32(4):187-191.(in Chinese)
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[9]Cao P,Jin F,Zhou C,et al.Steady-state dynamic method:An efficient and effective way to predict dynamic modulus of asphalt concrete[J].Construction and Building Materials,2016,111:54-62.
[10]Cao P,Jin F,Feng D,et al.Prediction on dynamic modulus of asphalt concrete with random aggregate modeling methods and virtual physics engine[J].Construction and Building Materials,2016,125:987-997.
[11]Leite J P B,Slowik V,Mihashi H.Computer simulation of fracture processes of concrete using mesolevel models of lattice structures[J].Cement&Concrete Research,2004,34(6):1025-1033.
[12]杜修力,金浏.非均质混凝土材料破坏的三维细观数值模拟[J].工程力学,2013,30(2):82-88.DU Xiuli,JIN Liu.Numerical simulation of threedimensional meso-mechanical model for damage process of heterogeneous concrete[J].Engineering Mechanics,2013,30(2):82-88.(in Chinese)
[13]唐明,杨欢.玄武岩纤维增强水泥基复合材料研究[J].混凝土,2010(5):76-78.TANG Ming,YANG Huan.Basalt fiber reinforce cementbased composite materials[J].Concrete,2010(5):76-78.(in Chinese)
[14]付庆丰,侯启超,张效沛.玄武岩纤维混凝土的技术研究现状及应用[J].吉林建筑工程学院学报,2011,28(4):32-34.FU Qingfeng,HOU Qichao,ZHANG Xiaopei.The basalt fiber concrete technology research situation and application[J].Journal of Jilin Institute of Architecture and Civil Engineering,2011,28(4):32-34.(in Chinese)
[15]Wang D,Wang L,Gu X,et al.Effect of basalt fiber on the asphalt binder and mastic at low temperature[J].Journal of Materials in Civil Engineering,2013,25(3):355-364.
[16]Ludovico M D,Prota A,Manfredi G.Structural upgrade using basalt fibers for concrete confinement[J].Journal of Composites for Construction,2012,14(5):541-552.
[17]吴俊,杨新华,叶永.基于Eshelby等效夹杂理论的沥青混合料有效粘弹性质分析[J].工程力学,2012,29(10):244-248.WUN Jun,YANG Xinhua,YE Yong.Study of viscoelastic mechanical properties of asphalt mixture based on the eshelby equivalent inclusion method[J].Engineering Mechanics,2012,29(10):244-248.(in Chinese)
[18]胡敏,徐国元,胡盛斌.基于Eshelby张量和MoriTanaka等效方法的砂卵石土等效弹性模量研究[J].岩土力学,2013(5):1437-1442.HU Min,XU Guoyuan,HU Shengbin.Study of equivalent elastic modulus of sand gravel soil with Eshelby tensor and Mori-Tanaka equivalent method[J].Rock and Soil Mechanics,2013(5):1437-1442.(in Chinese)
[19]Matzenmiller A,Lubliner J,Taylor R L.A constitutive model for anisotropic damage in fiber-composites[J].Mechanics of Materials,1995,20(2):125-152.
[20]纤维混凝土试验方法标准:CECS 13:2009[S].北京:中国计划出版社,2010:35-38.Standard for test method for fiber reinforced concrete:CECS 13:2009[S].Beijing:China Planning Press,2010:35-38.(in Chinese)
[21]Stock A F,Hannant D J,Williams R I T.The effect of aggregate concentration upon the strength and modulus of elasticity of concrete[J].Magazine of Concrete Research,1979,31(109):225-234.
[22]孙洋.碳纤维复合材料连接结构的强度分析及其影响因素[D].哈尔滨:哈尔滨工业大学,2016.SUN Yang.Failure strength and main factors analysis of carbon fibercomposites bolted joints[D].Harbin:Harbin Institute of Technology,2016.(in Chinese)
[2]郑文忠,吕雪源.活性粉末混凝土研究进展[J].建筑结构学报,2015,36(10):44-58.ZHENG Wenzhong,LV Xueyuan.Literature review of reactive powder concrete[J].Journal of Building Structures,2015,36(10):44-58.(in Chinese)
[3]孙露,陈徐东,石丹丹.纤维种类和总掺量对混凝土弯曲疲劳寿命分布的影响[J].混凝土,2018(2):37-41.SUN Lu,CHEN Xudong,SHI Dandan.Influence of fiber types and total dosage of fatigue life distribution of concrete under flexure loading[J].Concrete,2018(2):37-41.(in Chinese)
[4]彭苗,黄浩雄,廖清河,等.玄武岩纤维混凝土基本力学性能试验研究[J].混凝土,2012(1):74-75.PENG Miao,HUANG Haoxiong,LIAO Qinghe,et al.Test study on basic mechanical properties of basalt fiber reinforce concrete[J].Concrete,2012(1):74-75.(in Chinese)
[5]司秀勇,潘慧敏.纤维对混凝土早期抗裂性能的影响[J].硅酸盐通报,2011,30(6):1425-1429.SI Xiuyong,PAN Huimin.Influences of fiber on early crack resistance of concrete[J].Bulletin of the Chinese Ceramic Society,2011,30(6):1425-1429.(in Chinese)
[6]邱庆莉,洪叶南,李海光,等.聚丙烯纤维硅粉混凝土强度与早期抗裂性能试验[J].科技通报,2016,32(4):187-191.QIU Qingli,HONG Yenan,LI Haiguang,et al.Strength and early crack resistance experiment of polypropylene fiber reinforced concrete with silicon powder[J].Bulletin of Science&Technology,2016,32(4):187-191.(in Chinese)
[7]Wittmann F H,Roelfstra P E,Sadouki H.Simulation and analysis of composite structures[J].Materials Science&Engineering,1985,68(2):239-248.
[8]Xu Z,Hao H,Li H N.Mesoscale modelling of fibre reinforced concrete material under compressive impact loading[J].Construction&Building Materials,2012,26(1):274-288.
[9]Cao P,Jin F,Zhou C,et al.Steady-state dynamic method:An efficient and effective way to predict dynamic modulus of asphalt concrete[J].Construction and Building Materials,2016,111:54-62.
[10]Cao P,Jin F,Feng D,et al.Prediction on dynamic modulus of asphalt concrete with random aggregate modeling methods and virtual physics engine[J].Construction and Building Materials,2016,125:987-997.
[11]Leite J P B,Slowik V,Mihashi H.Computer simulation of fracture processes of concrete using mesolevel models of lattice structures[J].Cement&Concrete Research,2004,34(6):1025-1033.
[12]杜修力,金浏.非均质混凝土材料破坏的三维细观数值模拟[J].工程力学,2013,30(2):82-88.DU Xiuli,JIN Liu.Numerical simulation of threedimensional meso-mechanical model for damage process of heterogeneous concrete[J].Engineering Mechanics,2013,30(2):82-88.(in Chinese)
[13]唐明,杨欢.玄武岩纤维增强水泥基复合材料研究[J].混凝土,2010(5):76-78.TANG Ming,YANG Huan.Basalt fiber reinforce cementbased composite materials[J].Concrete,2010(5):76-78.(in Chinese)
[14]付庆丰,侯启超,张效沛.玄武岩纤维混凝土的技术研究现状及应用[J].吉林建筑工程学院学报,2011,28(4):32-34.FU Qingfeng,HOU Qichao,ZHANG Xiaopei.The basalt fiber concrete technology research situation and application[J].Journal of Jilin Institute of Architecture and Civil Engineering,2011,28(4):32-34.(in Chinese)
[15]Wang D,Wang L,Gu X,et al.Effect of basalt fiber on the asphalt binder and mastic at low temperature[J].Journal of Materials in Civil Engineering,2013,25(3):355-364.
[16]Ludovico M D,Prota A,Manfredi G.Structural upgrade using basalt fibers for concrete confinement[J].Journal of Composites for Construction,2012,14(5):541-552.
[17]吴俊,杨新华,叶永.基于Eshelby等效夹杂理论的沥青混合料有效粘弹性质分析[J].工程力学,2012,29(10):244-248.WUN Jun,YANG Xinhua,YE Yong.Study of viscoelastic mechanical properties of asphalt mixture based on the eshelby equivalent inclusion method[J].Engineering Mechanics,2012,29(10):244-248.(in Chinese)
[18]胡敏,徐国元,胡盛斌.基于Eshelby张量和MoriTanaka等效方法的砂卵石土等效弹性模量研究[J].岩土力学,2013(5):1437-1442.HU Min,XU Guoyuan,HU Shengbin.Study of equivalent elastic modulus of sand gravel soil with Eshelby tensor and Mori-Tanaka equivalent method[J].Rock and Soil Mechanics,2013(5):1437-1442.(in Chinese)
[19]Matzenmiller A,Lubliner J,Taylor R L.A constitutive model for anisotropic damage in fiber-composites[J].Mechanics of Materials,1995,20(2):125-152.
[20]纤维混凝土试验方法标准:CECS 13:2009[S].北京:中国计划出版社,2010:35-38.Standard for test method for fiber reinforced concrete:CECS 13:2009[S].Beijing:China Planning Press,2010:35-38.(in Chinese)
[21]Stock A F,Hannant D J,Williams R I T.The effect of aggregate concentration upon the strength and modulus of elasticity of concrete[J].Magazine of Concrete Research,1979,31(109):225-234.
[22]孙洋.碳纤维复合材料连接结构的强度分析及其影响因素[D].哈尔滨:哈尔滨工业大学,2016.SUN Yang.Failure strength and main factors analysis of carbon fibercomposites bolted joints[D].Harbin:Harbin Institute of Technology,2016.(in Chinese)