磷酸钾镁水泥中硫酸根离子扩散研究
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摘要
通过磷酸钾镁水泥(Potassium magnesium phosphate cement,MKPC)在5%Na2SO4溶液中的长期浸泡、冻融循环和电脉冲试验,并测定其中不同深度和不同侵蚀时间的硫酸根扩散浓度,分析MKPC在不同侵蚀环境中的硫酸根扩散规律,基于Fick扩散定律求解不同条件下硫酸根离子扩散系数。结果表明:MKPC在三种侵蚀条件中的硫酸根扩散浓度均随侵蚀时间增加而增大,且硫酸根最大扩散深度x与侵蚀时间t之间关系遵循幂函数x=atb;求得冻融循环和电脉冲的硫酸根扩散系数相比长期浸泡环境高一数量级,冻融循环和电脉冲均能有效加快硫酸根在MKPC中的迁移扩散。
The long-term immersion,freeze-thaw cycle and electrical pulse test of potassium magnesium phosphate in five percent sodium sulfate solution were carried out, and measuring the diffusion concentration of sulfate radical in different depths and different erosion times,the diffusion law of sulfate radical in different erosive environment of MKPC was analyzed. It was based on the Fick's diffusion law to solve the diffusion coefficient of sulfate ion under different conditions. The results show that the diffusion concentration of MKPC in the three kinds of erosion conditions increases with the increase of erosion time. The relationship between the maximum diffusion depth of sulphate root and the time of erosion follows a power function x = atb. The diffusion coefficient of the sulfate radical of the freeze-thaw cycle and electric pulse is one order of magnitude higher than that of the long-term soaking environment.Both freeze-thaw cycle and electric pulse can effectively accelerate the migration and diffusion of sulfate in MKPC.
The long-term immersion,freeze-thaw cycle and electrical pulse test of potassium magnesium phosphate in five percent sodium sulfate solution were carried out, and measuring the diffusion concentration of sulfate radical in different depths and different erosion times,the diffusion law of sulfate radical in different erosive environment of MKPC was analyzed. It was based on the Fick's diffusion law to solve the diffusion coefficient of sulfate ion under different conditions. The results show that the diffusion concentration of MKPC in the three kinds of erosion conditions increases with the increase of erosion time. The relationship between the maximum diffusion depth of sulphate root and the time of erosion follows a power function x = atb. The diffusion coefficient of the sulfate radical of the freeze-thaw cycle and electric pulse is one order of magnitude higher than that of the long-term soaking environment.Both freeze-thaw cycle and electric pulse can effectively accelerate the migration and diffusion of sulfate in MKPC.
引文
[1]孙道胜,孙鹏,王爱国,等.磷酸镁水泥的研究与发展前景[J].材料导报,2013,27(9):70-75.
[2]常远,史才军,杨楠,等.磷酸镁水泥基材料耐久性研究进展[J].硅酸盐学报,2014,42(4):486-493.
[3]李九苏,王宇文,张文勃.磷酸镁水泥混凝土耐久性试验研究[J].硅酸盐通报,2014,33(10):2666-2671.
[4]杨建明.磷酸钾镁水泥凝结时间和水稳定性的调控及其机理[D].南京:东南大学,2011.
[5]杨楠.磷酸镁水泥基材料粘结性能研究[D].长沙:湖南大学,2014.
[6]陈兵,吴震,吴雪萍.磷酸镁水泥改性试验研究[J].武汉理工大学学报,2011(4):29-34.
[7]甄树聪,杨建明,张青行,等.磷酸镁水泥抗氯离子侵蚀性能研究[J].建筑材料学报,2010,13(5):700-704.
[8]梁咏宁,袁迎曙.硫酸钠和硫酸镁溶液中混凝土腐蚀破坏的机理[J].硅酸盐学报,2007,35(4):504-508.
[9] Chen J K,Jiang M Q,Zhu J. Damage evolution in cement mortar due to erosion of sulphate[J]. Corrosion Science,2008,50(9):2478-2483.
[10]孙超.基于侵蚀损伤演化的混凝土中硫酸根离子扩散模型[D].宁波:宁波大学,2012.
[11]曾燕伟.无机材料科学基础.第2版[M].武汉:武汉理工大学出版社,2011.
[2]常远,史才军,杨楠,等.磷酸镁水泥基材料耐久性研究进展[J].硅酸盐学报,2014,42(4):486-493.
[3]李九苏,王宇文,张文勃.磷酸镁水泥混凝土耐久性试验研究[J].硅酸盐通报,2014,33(10):2666-2671.
[4]杨建明.磷酸钾镁水泥凝结时间和水稳定性的调控及其机理[D].南京:东南大学,2011.
[5]杨楠.磷酸镁水泥基材料粘结性能研究[D].长沙:湖南大学,2014.
[6]陈兵,吴震,吴雪萍.磷酸镁水泥改性试验研究[J].武汉理工大学学报,2011(4):29-34.
[7]甄树聪,杨建明,张青行,等.磷酸镁水泥抗氯离子侵蚀性能研究[J].建筑材料学报,2010,13(5):700-704.
[8]梁咏宁,袁迎曙.硫酸钠和硫酸镁溶液中混凝土腐蚀破坏的机理[J].硅酸盐学报,2007,35(4):504-508.
[9] Chen J K,Jiang M Q,Zhu J. Damage evolution in cement mortar due to erosion of sulphate[J]. Corrosion Science,2008,50(9):2478-2483.
[10]孙超.基于侵蚀损伤演化的混凝土中硫酸根离子扩散模型[D].宁波:宁波大学,2012.
[11]曾燕伟.无机材料科学基础.第2版[M].武汉:武汉理工大学出版社,2011.