硫酸盐侵蚀对混凝土微观形貌的影响
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摘要
硫酸盐是一种危害性较大的侵蚀性介质,是影响混凝土结构耐久性的重要因素之一.研究硫酸盐对混凝土微观结构的影响具有重要意义.通过扫描电镜试验研究分析了浸泡时间、硫酸盐溶液类型、混凝土强度等级对混凝土微观形貌的影响.结果表明,同等级混凝土浸泡在相同浓度下的不同溶液中,以硫酸钠和硫酸镁复合溶液侵蚀破坏程度最为严重;氯离子的存在可以减轻混凝土受硫酸盐腐蚀的破坏程度;相同浸泡条件下,C40混凝土受硫酸盐侵蚀最为严重.
As a kind of harmful aggressive media,sulfate is considered as one of the important factors affecting the durability of concrete. It is extremely significant to research the influence of sulfate on the microstructure of concrete.The effects of soaking time,type of sulfate solution and strength grade of concrete on the microstructure of concrete are studied by SEM. The results show that the corrosion damage is the most serious in the same concentration of sodium sulfate and magnesium sulfate composite solution. The presence of chloride ions in the composite solution can delay the damage of concrete by sulfate corrosion. With the same immersion condition,the corrosion damage of C40 concrete under sulfate is the most serious.
As a kind of harmful aggressive media,sulfate is considered as one of the important factors affecting the durability of concrete. It is extremely significant to research the influence of sulfate on the microstructure of concrete.The effects of soaking time,type of sulfate solution and strength grade of concrete on the microstructure of concrete are studied by SEM. The results show that the corrosion damage is the most serious in the same concentration of sodium sulfate and magnesium sulfate composite solution. The presence of chloride ions in the composite solution can delay the damage of concrete by sulfate corrosion. With the same immersion condition,the corrosion damage of C40 concrete under sulfate is the most serious.
引文
[1]余红发,孙伟,王春甲,等.盐湖地区混凝土的长期腐蚀产物及腐蚀机理[J].硅酸盐学报,2003,31(5):434-440.
[2]杨鼎宜,陈建康,徐敏,等.淮河入海水道工程抗侵蚀混凝土的研究[J].混凝土与水泥制品,2003(1):15-18.
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[4]仇新刚,马孝轩,孙秀武.钢筋混凝土在滨海盐土地区腐蚀规律试验研究[J].建筑科学,2001,17(6):41-43.
[5]马保国,贺行洋,苏英,等.内盐湖环境中混凝土硫酸盐侵蚀破坏研究[J].混凝土,2001(4):11-15.
[6]马宏威,张雷,林学玮,等.硫酸盐对桥涵基础混凝土的侵蚀分析及预防措施[J].东北公路,2003,26(2):119-121.
[7]贺传卿,李永贵,王怀义,等.硫酸盐对水泥混凝土的侵蚀及其防治措施[J].混凝土,2003(3):56-57.
[8] BICKLEY J A,HEMMINGS R T,HOOTON R D,et al. Thaumasite related deterioration of concrete structures[J]. ACI Journal,1994,144:159-176.
[9] THOMAS M D A,ROGERS C A,BLESZYNSKI R F. Occurrences of thaumasite in laboratory and field concrete[J]. Cement and Concrete Composites,2003,25(8):1045-1050.
[10] MEHTA K P,MONTEIRO P J M. Concrete microstructure,properties and materials[M]. 3nd Ed. New Jersey:McGraw-Hill Inc,2004:41-44.
[11] LIU Z Q,XIAO J,HUANG H,et al. Physicochemical study on the interface zone of concrete exposed to different sulfate solutions[J]. Journal of Wuhan University of Technology Material Science Edition,2006,21:167-175.
[12] SANTHANAM M,COHEN M D,OLEK J. Mechanism of sulfate attack:a fresh look-part I:summary of experimental results[J].Cem Concr Res,2002,32(6):915-921.
[13]梁咏宁,黄君一,林旭健,等.氯盐对受硫酸盐腐蚀混凝土性能的影响[J].福州大学学报(自然科学版),2011,39(6):947-951.
[14] CHATTERJI S. Freezing of air-entrained cement-based materials and specific actions of air-entraining agents[J]. Cement and Concrete Composites,2003,25(7):759-765.
[15]余红发.盐湖地区高性能混凝土的耐久性、机理与使用寿命预测方法[D].南京:东南大学,2004.
[16]邓德华,肖佳,元强.水泥基材料中的碳硫硅钙石[J].建筑材料学报,2005,8(4):400-409.
[17]杨全兵,朱蓓蓉.混凝土盐结晶破坏的研究[J].建筑材料学报,2007,10(4):392-396.
[18] SANTHANAM M,COHEN M D,OLEK J. Sulfate attack research-whither now?[J]. Cement and Concrete Research,2001,31(6):845-851.
[19]段德峰,黄显冲,王晓川.受硫酸盐腐蚀混凝土微观结构分析[J].四川建筑科学研究,2015,41(2):202-207.
[20]王家滨,牛荻涛,马蕊.硫酸盐侵蚀喷射混凝土损伤层及微观结构研究[J].武汉理工大学学报,2014,36(10):105-112.
[21]刘俊,牛荻涛,宋华.掺合料混凝土在不同硫酸盐环境中的性能分析[J].混凝土,2010(5):3-6.
[22]杜健民,焦瑞敏,姬永生.氯离子含量对混凝土硫酸盐腐蚀程度的影响研究[J].中国矿业大学学报,2012,41(6):906-911.
[23]刘赞群,邓德华,Geert DE SCHUTTER,等.“混凝土硫酸盐结晶破坏”微观分析(Ⅰ)—水泥净浆[J].硅酸盐学报,2012,40(2):186-193.
[24]中华人民共和国住房和城乡建设部,中华人民共和国国家质量监督检验检疫总局.混凝土结构耐久性设计规范:GB 50476—2008[S].北京:中国建筑工业出版社,2008.
[2]杨鼎宜,陈建康,徐敏,等.淮河入海水道工程抗侵蚀混凝土的研究[J].混凝土与水泥制品,2003(1):15-18.
[3]杜建民,梁咏宁,张风杰.地下结构混凝土硫酸盐腐蚀机理及性能退化[M].北京:中国铁道出版社,2011.
[4]仇新刚,马孝轩,孙秀武.钢筋混凝土在滨海盐土地区腐蚀规律试验研究[J].建筑科学,2001,17(6):41-43.
[5]马保国,贺行洋,苏英,等.内盐湖环境中混凝土硫酸盐侵蚀破坏研究[J].混凝土,2001(4):11-15.
[6]马宏威,张雷,林学玮,等.硫酸盐对桥涵基础混凝土的侵蚀分析及预防措施[J].东北公路,2003,26(2):119-121.
[7]贺传卿,李永贵,王怀义,等.硫酸盐对水泥混凝土的侵蚀及其防治措施[J].混凝土,2003(3):56-57.
[8] BICKLEY J A,HEMMINGS R T,HOOTON R D,et al. Thaumasite related deterioration of concrete structures[J]. ACI Journal,1994,144:159-176.
[9] THOMAS M D A,ROGERS C A,BLESZYNSKI R F. Occurrences of thaumasite in laboratory and field concrete[J]. Cement and Concrete Composites,2003,25(8):1045-1050.
[10] MEHTA K P,MONTEIRO P J M. Concrete microstructure,properties and materials[M]. 3nd Ed. New Jersey:McGraw-Hill Inc,2004:41-44.
[11] LIU Z Q,XIAO J,HUANG H,et al. Physicochemical study on the interface zone of concrete exposed to different sulfate solutions[J]. Journal of Wuhan University of Technology Material Science Edition,2006,21:167-175.
[12] SANTHANAM M,COHEN M D,OLEK J. Mechanism of sulfate attack:a fresh look-part I:summary of experimental results[J].Cem Concr Res,2002,32(6):915-921.
[13]梁咏宁,黄君一,林旭健,等.氯盐对受硫酸盐腐蚀混凝土性能的影响[J].福州大学学报(自然科学版),2011,39(6):947-951.
[14] CHATTERJI S. Freezing of air-entrained cement-based materials and specific actions of air-entraining agents[J]. Cement and Concrete Composites,2003,25(7):759-765.
[15]余红发.盐湖地区高性能混凝土的耐久性、机理与使用寿命预测方法[D].南京:东南大学,2004.
[16]邓德华,肖佳,元强.水泥基材料中的碳硫硅钙石[J].建筑材料学报,2005,8(4):400-409.
[17]杨全兵,朱蓓蓉.混凝土盐结晶破坏的研究[J].建筑材料学报,2007,10(4):392-396.
[18] SANTHANAM M,COHEN M D,OLEK J. Sulfate attack research-whither now?[J]. Cement and Concrete Research,2001,31(6):845-851.
[19]段德峰,黄显冲,王晓川.受硫酸盐腐蚀混凝土微观结构分析[J].四川建筑科学研究,2015,41(2):202-207.
[20]王家滨,牛荻涛,马蕊.硫酸盐侵蚀喷射混凝土损伤层及微观结构研究[J].武汉理工大学学报,2014,36(10):105-112.
[21]刘俊,牛荻涛,宋华.掺合料混凝土在不同硫酸盐环境中的性能分析[J].混凝土,2010(5):3-6.
[22]杜健民,焦瑞敏,姬永生.氯离子含量对混凝土硫酸盐腐蚀程度的影响研究[J].中国矿业大学学报,2012,41(6):906-911.
[23]刘赞群,邓德华,Geert DE SCHUTTER,等.“混凝土硫酸盐结晶破坏”微观分析(Ⅰ)—水泥净浆[J].硅酸盐学报,2012,40(2):186-193.
[24]中华人民共和国住房和城乡建设部,中华人民共和国国家质量监督检验检疫总局.混凝土结构耐久性设计规范:GB 50476—2008[S].北京:中国建筑工业出版社,2008.