西部自然环境下硫酸钠半浸泡混凝土的孔分形维数、孔结构与渗透性
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摘要
研究了西部自然的大温湿差环境下硫酸钠溶液半浸泡混凝土的孔分形维数、孔结构及其渗透性能。基于压汞法的测试数据,计算了孔的分形特征参数,如孔体积分形维数、孔轴分形维数、孔轴曲率。通过对分形特征参数与渗透率的分析,得到孔体积分形维数、孔轴曲率与渗透率的线性相关性;孔轴分形维数与渗透率的无相关性;同时对小于0.1μm孔的数量与渗透率的线性相关性进行了讨论。结果表明:不同养护条件和不同浓度硫酸钠溶液半浸泡的腐蚀条件主要影响小于0.1μm的孔,该区间的孔越多,抗渗透性能越好;标准养护条件下的抗渗透性最好,室外大温湿差条件下的抗渗透性最差;硫酸钠半浸泡试样暴露于室外大温湿差环境下的区域抗渗透性能比浸泡于硫酸钠溶液中的区域差。
The fractal dimension of pore,pore structure and penetrability for concrete half-submerged in sodium sulfate solution under large temperature and humidity difference environment in the west of China were studied.Based on the experimental data from mercury intrusion method,fractal characteristic parameters of pores such as pore volume fractal dimension,pore axial fractal dimension and pore shaft curvature were calculated and the correlation between fractal characteristic parameters and penetrability were also established. Meanwhile the relationship between those pores with diameter smaller than 0. 1 μm and penetrability were also discussed. The result shows that the curing condition and the concentration of sodium sulfate solution influence mainly those pores with diameter smaller than 0. 1 μm,and the better resistance penetrability the more those pores. For different curing conditions,penetrability resistance under standard curing is the best,and that of large temperature and humidity difference outdoor is the worst. For different corrosion conditions,the penetrability resistance of concrete exposed to natural environment is worse than that of concrete submerged in sodium sulfate solution.
The fractal dimension of pore,pore structure and penetrability for concrete half-submerged in sodium sulfate solution under large temperature and humidity difference environment in the west of China were studied.Based on the experimental data from mercury intrusion method,fractal characteristic parameters of pores such as pore volume fractal dimension,pore axial fractal dimension and pore shaft curvature were calculated and the correlation between fractal characteristic parameters and penetrability were also established. Meanwhile the relationship between those pores with diameter smaller than 0. 1 μm and penetrability were also discussed. The result shows that the curing condition and the concentration of sodium sulfate solution influence mainly those pores with diameter smaller than 0. 1 μm,and the better resistance penetrability the more those pores. For different curing conditions,penetrability resistance under standard curing is the best,and that of large temperature and humidity difference outdoor is the worst. For different corrosion conditions,the penetrability resistance of concrete exposed to natural environment is worse than that of concrete submerged in sodium sulfate solution.
引文
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6李盛.不同含气量水泥砂浆孔体积分形维数研究.公路交通科技,2016;33(6):54-60Li S.Study on pore volume fractal dimension for cement mortar with different air contents.Journal of Highway and Transportations Research and Development,2016;33(6):54-60
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8金珊珊,张金喜,陈春珍,等.水泥砂浆孔结构分形特征的研究.建筑材料学报,2011;14(1):92-97Jin S S,Zhang J X,Chen C Z,et al.Study of pore fractal characteristic of cement mortar.Journal of Building Materials,2011;14(1):92-97
9谢超,王起才,李盛,等.不同水灰比、养护条件下混凝土孔结构、抗压强度与分形维数之间的关系.硅酸盐通报,2015;34(12):3695-3702Xie C,Wang Q C,Li S,et al.Relations of pore fractal dimension to pore structure and compressive strength of concrete under different water to binder ratio and curing condition.Bulletin of the Chinese Ceramic Society,2015;34(12):3695-3702
10张宇,金祖权,张云升.不同方式养护高强水泥基材料孔表面积分形维数与孔结构的关系.硅酸盐学报,2017;45(2):249-253Zhang Y,Jin Z Q,Zhang Y S.Relationship between pore surface fractal dimension and pore structure of high strength cementitious materials cured by different methods.Journal of the Chinese Ceramic Society,2017;45(2):249-253
11杨淑雁,马钊,沈益韩,等.大温湿差、大湿差环境下硫酸钠半浸泡混凝土抗压与微观特性.科学技术与工程,2017;17(16):295-299Yang S Y,Ma Z,Shen Y H,et al.Compressive and microscope property of concrete partially submerged in sodium sulfate solution under large temperature and relative humidity difference environment.Science Technology and Engineering,2017;17(16):295-299
12万惠文,杨淑雁,吕艳峰.引气混凝土抗氯离子渗透性与孔结构特性.建筑材料学报,2008;11(4):409-413Wan H W,Yang S Y,Lv Y F.Resistance to chloride ion penetration and properties of pore structure in air-entraining concrete.Journal of Building Materials,2008;11(4):409-413
2林晖,侯捷,卢小琳,等.硫酸盐对水泥基材料微观结构的影响.混凝土,2005;193(11):6-9Lin H,Hou J,Lu X L,et al.Effect of sulfate on the microstructure of cementitious materials.Concrete,2005;193(11):6-9
3段德峰,黄显冲,王晓川.受硫酸盐腐蚀混凝土微观结构分析.四川建筑科学研究,2015;41(2):202-207Duan D F,Huang X C,Wang X C.Microstructure analysis of concrete under sulfate corrosion.Sichuan Building Science,2015;41(2):202-207
4唐明,李晓.多种因素对混凝土孔结构分形特征的影响研究.沈阳建筑大学学报(自然科学版),2005;21(3):232-237Tang M,Li X.Influence of multi-factors on fractal characteristics for pore structure.Journal of Shenyang Architecture and Civil Engineering University(Natural Science Edition),2005;21(3):232-237
5尹红宇.混凝土孔结构的分形特征研究.南宁:广西大学,2006Yin H Y.Study the fractal characteristic of pore structure for concrete.Nanning:Guangxi University,2006
6李盛.不同含气量水泥砂浆孔体积分形维数研究.公路交通科技,2016;33(6):54-60Li S.Study on pore volume fractal dimension for cement mortar with different air contents.Journal of Highway and Transportations Research and Development,2016;33(6):54-60
7李永鑫,陈益民,贺行洋,等.粉煤灰-水泥浆体的孔体积分形维数及其孔结构和强度的关系.硅酸盐学报,2003;31(8):774-779Li Y X,Chen Y M,He X Y,et al.Pore volume fractal dimension of fly ash-cement paste and its relationship between the pore structure and strength.Journal of the Chinese Ceramic Society,2003;31(8):774-779
8金珊珊,张金喜,陈春珍,等.水泥砂浆孔结构分形特征的研究.建筑材料学报,2011;14(1):92-97Jin S S,Zhang J X,Chen C Z,et al.Study of pore fractal characteristic of cement mortar.Journal of Building Materials,2011;14(1):92-97
9谢超,王起才,李盛,等.不同水灰比、养护条件下混凝土孔结构、抗压强度与分形维数之间的关系.硅酸盐通报,2015;34(12):3695-3702Xie C,Wang Q C,Li S,et al.Relations of pore fractal dimension to pore structure and compressive strength of concrete under different water to binder ratio and curing condition.Bulletin of the Chinese Ceramic Society,2015;34(12):3695-3702
10张宇,金祖权,张云升.不同方式养护高强水泥基材料孔表面积分形维数与孔结构的关系.硅酸盐学报,2017;45(2):249-253Zhang Y,Jin Z Q,Zhang Y S.Relationship between pore surface fractal dimension and pore structure of high strength cementitious materials cured by different methods.Journal of the Chinese Ceramic Society,2017;45(2):249-253
11杨淑雁,马钊,沈益韩,等.大温湿差、大湿差环境下硫酸钠半浸泡混凝土抗压与微观特性.科学技术与工程,2017;17(16):295-299Yang S Y,Ma Z,Shen Y H,et al.Compressive and microscope property of concrete partially submerged in sodium sulfate solution under large temperature and relative humidity difference environment.Science Technology and Engineering,2017;17(16):295-299
12万惠文,杨淑雁,吕艳峰.引气混凝土抗氯离子渗透性与孔结构特性.建筑材料学报,2008;11(4):409-413Wan H W,Yang S Y,Lv Y F.Resistance to chloride ion penetration and properties of pore structure in air-entraining concrete.Journal of Building Materials,2008;11(4):409-413