聚丙烯纤维混凝土中硫酸盐扩散过程数值模拟
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摘要
为了研究聚丙烯纤维混凝土中硫酸盐的扩散过程,首先根据聚丙烯纤维在混凝土中的空间分布特征,将其空间分布分为贯通型、半贯通型和内嵌型3种类型,分别计算了3种类型聚丙烯纤维对孔隙率的影响规律,然后基于Fick第二定律及反应动力学方程,建立了硫酸根离子在聚丙烯纤维混凝土中的扩散模型,并采用有限差分法进行数值求解,实现了对任意位置处硫酸根离子浓度的数值求解;最后采用聚丙烯纤维混凝土硫酸盐侵蚀试验对数值模拟结果进行对比验证。结果表明,数值计算结果与实际试验结果相对误差不超过17.65%,精度较高。
In order to study the diffusion process of sulfate in polypropylene fiber concrete.Firstly,according to the spatial distribution characteristics of polypropylene fibers in concrete,the spatial distribution was divided into three types,and they were through type,semi-through type and embedded type,and the influence of three types of polypropylene fibers on the porosity was calculated.Then,based on Fick's second law and reaction kinetics equation,the diffusion model of sulfate ion in polypropylene fiber concrete was established.And the finite difference method was used to solve the numerical solution of the concentration of sulfate ions at any position.Finally,the numerical simulation results of polypropylene fiber reinforced concrete sulfate erosion test were compared.The results show that the relative error between the numerical results and the actual experimental results is not more than 17.65%,so the accuracy is high.
In order to study the diffusion process of sulfate in polypropylene fiber concrete.Firstly,according to the spatial distribution characteristics of polypropylene fibers in concrete,the spatial distribution was divided into three types,and they were through type,semi-through type and embedded type,and the influence of three types of polypropylene fibers on the porosity was calculated.Then,based on Fick's second law and reaction kinetics equation,the diffusion model of sulfate ion in polypropylene fiber concrete was established.And the finite difference method was used to solve the numerical solution of the concentration of sulfate ions at any position.Finally,the numerical simulation results of polypropylene fiber reinforced concrete sulfate erosion test were compared.The results show that the relative error between the numerical results and the actual experimental results is not more than 17.65%,so the accuracy is high.
引文
[1]代兵权.改性聚丙烯纤维混凝土耐久性能试验研究[D].郑州:郑州大学,2010.
[2]孔琳洁,欧阳东,傅浩,等.聚丙烯纤维对混凝土耐硫酸盐腐蚀性能的影响[J].硅酸盐通报,2013,32(8):1650-1656.
[3]麻海舰,余红发,马好霞,等.纤维增强高性能混凝土在醋酸钙镁溶液中的抗腐蚀性[J].硅酸盐通报,2014,33(4):923-927.
[4]Shi X,Xie N,Fortune K,et al.Durability of steel reinforced concrete in chloride environments:An overview[J].Construction and Building Materials,2012,30:125-138.
[5]Guneyisi E,Gesoglu M,Mermerdas K.Strength deteration of plain and metakaolin concretes in aggressive sulfate environments[J].Journal of Materials in Civil Engineering,2010,22(4):403-407.
[6]Kurtis K E,Monteiro P J M,Madanat S.Empirical models to predict concrete expansion caused by sulfate attack[J].ACI Materials Journal,2000,97(2):156-161.
[7]Marchand,Samson,Maltais,et al.Theoretical analysis of the effect of weak sodium sulfate solutions on the durability of concrete[J].Cement and Concrete Composites,2002,24:317-329.
[8]Gospodinov.Numerical simulation of 3D sulfate ion diffusion and liquid push out of the material capillaries in cement composites[J].Cement and Concrete Research,2005,35:520-526.
[9]赵顺波,杨晓明.受侵蚀混凝土内硫酸根离子扩散及分布规律试验研究[J].中国港湾建设,2009,56(3):26-29.
[10]左晓宝,孙伟.硫酸盐侵蚀下的混凝土损伤破坏全过程[J].硅酸盐学报,2009,37(7):103-106.
[11]Ferraris C F,Clifton J R,Stutzman P E,et al.22 Mechanisms of Degradation of Portland Cement-based Systems by Sulfate Attack[C].Mechanisms of Chemical Degradation of Cement-based Systems:Proceedings of the Materials Research Society's Symposium on Mechanisms of Chemical Degradation of Cement-based Systems,Boston,USA,27-30.November 1995.Taylor&Francis,1997:185.
[12]Tixier R,Mobasher B.Modeling of damage in cement-based materials subjected to external sulfate attack[J].Journal of Materials in Civil Engineering,2003,15(4):305-313.
[13]Maloney J O.Perry's chemical engineers'handbook[M].New York:Mc Graw-Hill,2008.
[14]Clifton J R,Bentz D P,Ponnersheim J M.Sulfate diffusionin concrete[M].US Department of Commerce,Technology Administration,National Institute of Standards and Technology,1994.
[15]Xiaobao Z.Modeling ion diffusion-reaction behavior in concrete associated with durability deterioration subjected to couplings of environmental and mechanical loadings[R].Nanjing:School of Materials Science and Engineering,Southeast University,2011.
[16]Samson E,Marchand J,Robert J l,et al.Modelling ion diffusion mechanisms in porous media[J].International Journal of Numerical Methods in Engineering,1999,46(12):2043-2060.
[17]Chandra A,Bahchi B.Ion conductance in electrolyte solutions[J].The Journal of Chemical Physics,1999,110:10024-10029.
[18]Zuo X B,Sun W,Yu C,et al.Modeling of ion diffusion coefficient in saturated concrete[J].Computers&Concrete,2010,7(5):421-435.
[2]孔琳洁,欧阳东,傅浩,等.聚丙烯纤维对混凝土耐硫酸盐腐蚀性能的影响[J].硅酸盐通报,2013,32(8):1650-1656.
[3]麻海舰,余红发,马好霞,等.纤维增强高性能混凝土在醋酸钙镁溶液中的抗腐蚀性[J].硅酸盐通报,2014,33(4):923-927.
[4]Shi X,Xie N,Fortune K,et al.Durability of steel reinforced concrete in chloride environments:An overview[J].Construction and Building Materials,2012,30:125-138.
[5]Guneyisi E,Gesoglu M,Mermerdas K.Strength deteration of plain and metakaolin concretes in aggressive sulfate environments[J].Journal of Materials in Civil Engineering,2010,22(4):403-407.
[6]Kurtis K E,Monteiro P J M,Madanat S.Empirical models to predict concrete expansion caused by sulfate attack[J].ACI Materials Journal,2000,97(2):156-161.
[7]Marchand,Samson,Maltais,et al.Theoretical analysis of the effect of weak sodium sulfate solutions on the durability of concrete[J].Cement and Concrete Composites,2002,24:317-329.
[8]Gospodinov.Numerical simulation of 3D sulfate ion diffusion and liquid push out of the material capillaries in cement composites[J].Cement and Concrete Research,2005,35:520-526.
[9]赵顺波,杨晓明.受侵蚀混凝土内硫酸根离子扩散及分布规律试验研究[J].中国港湾建设,2009,56(3):26-29.
[10]左晓宝,孙伟.硫酸盐侵蚀下的混凝土损伤破坏全过程[J].硅酸盐学报,2009,37(7):103-106.
[11]Ferraris C F,Clifton J R,Stutzman P E,et al.22 Mechanisms of Degradation of Portland Cement-based Systems by Sulfate Attack[C].Mechanisms of Chemical Degradation of Cement-based Systems:Proceedings of the Materials Research Society's Symposium on Mechanisms of Chemical Degradation of Cement-based Systems,Boston,USA,27-30.November 1995.Taylor&Francis,1997:185.
[12]Tixier R,Mobasher B.Modeling of damage in cement-based materials subjected to external sulfate attack[J].Journal of Materials in Civil Engineering,2003,15(4):305-313.
[13]Maloney J O.Perry's chemical engineers'handbook[M].New York:Mc Graw-Hill,2008.
[14]Clifton J R,Bentz D P,Ponnersheim J M.Sulfate diffusionin concrete[M].US Department of Commerce,Technology Administration,National Institute of Standards and Technology,1994.
[15]Xiaobao Z.Modeling ion diffusion-reaction behavior in concrete associated with durability deterioration subjected to couplings of environmental and mechanical loadings[R].Nanjing:School of Materials Science and Engineering,Southeast University,2011.
[16]Samson E,Marchand J,Robert J l,et al.Modelling ion diffusion mechanisms in porous media[J].International Journal of Numerical Methods in Engineering,1999,46(12):2043-2060.
[17]Chandra A,Bahchi B.Ion conductance in electrolyte solutions[J].The Journal of Chemical Physics,1999,110:10024-10029.
[18]Zuo X B,Sun W,Yu C,et al.Modeling of ion diffusion coefficient in saturated concrete[J].Computers&Concrete,2010,7(5):421-435.