首页期刊信息编委及顾问期刊发行联系方式使用帮助常见问题ENGLISH
位置:首页 >> 正文
矿物掺合料与钢筋表面状态对砂浆中钢筋锈蚀的影响
作者:施锦杰 孙伟 
单位:东南大学材料科学与工程学院 江苏省土木工程材料重点实验室 南京 211189 
关键词:钢筋 预钝 预锈 硅灰 粉煤灰 锈蚀 
分类号:TU 528
出版年,卷(期):页码:2011,39(1):54-62
DOI:
摘要:

通过电化学方法和剖型观察方法研究了不同矿物掺合料(硅灰和粉煤灰)和不同钢筋表面状态(预钝、预锈和未处理)对砂浆试样中的钢筋锈蚀行为的影响。用电化学阻抗谱法测试钢筋的腐蚀速率和与钢筋锈蚀相关的电化学参数。结果表明:硅灰由于发生火山灰反应而明显降低体系的pH值,且硅灰结合氯离子的能力明显弱于粉煤灰,氯离子临界值也低于掺粉煤灰试样。基于以上3个负作用,在短期氯盐侵蚀后硅灰的护筋性不佳,相比而言粉煤灰只要掺量合适可以较好地保护钢筋。钢筋表面若无明显腐蚀坑,预锈处理对钢筋锈蚀影响较小(除掺硅灰试样外);预钝化能降低含矿物掺合料砂浆中钢筋的腐蚀速率,但对无掺合料砂浆试样中的钢筋影响很小。

redirect how to cheat why women cheat on men they love
amoxicillin amoxicillin amoxicillin

The effects of different mineral admixtures (silica fume and fly ash) and steel surface conditions (pre-passivated, pre-rusted and as-received) on steel corrosion in mortar specimens were investigated by electrochemical method and visual inspection. Electrochemical impedance spectroscopy (EIS) was used to determine corrosion current density (icorr) and other electrochemical parameters related to steel corrosion. The results show that silica fume reduced the pH value of pore solution in mortar due to the pozzolanic reaction. In addition, both chloride binding capacity and chloride threshold level of specimens with silica fume were lower than that with fly ash. It indicates that the silica fume could not increase the corrosion resistance of steel in mortar effectively during the short-term exposure, but fly ash strongly protected steel against corroison if added in appropriate proportion. Pre-rust on the steel surface had little effect to steel corrosion (except for silica fume mortar). However, pre-passivation reduced the corrosion rate of steel in mineral admixtures-containing mortars, but it could not affect the corrosion rate of steel without mineral admixtures.

married cheaters cheat on my wife click
why women cheat on husbands link link
online want my wife to cheat married woman looking to cheat
how do i know if my wife has cheated infidelity in marriage read
redirect husband cheated unfaithful husband
my husband cheated on me click here women who cheat on husband
amoxicillin amoxicillin amoxicillin
基金项目:
国家“973”计划(2009CB623203);国家“863”计划(2008AA030704),东南大学优秀博士学位论文基金(YBJJ1017)资助项目。
作者简介:
博士研究生
why women cheat on husbands link link
how do i know if my wife has cheated infidelity in marriage read
my husband cheated on me redirect women who cheat on husband
cialis coupon cialis coupon cialis coupon
参考文献:

[1] HAUSMANN D A. Three myths about corrosion of steel in concrete [J]. Mater Performance, 2007, 46(8): 70-73. [2] SAGOE-CRENTSIL K K, GLASSER F P. Steel in concrete: Part I. a review of the electrochemical and thermodynamic aspects [J]. Mag Concr Res, 1989, 41(149): 205-212. [3] HUSSAIN S E, RASHEEDUZZAFAR. Influence of microsilica on protection from chloride-induced corrosion of reinforcing steel [J]. J Mater Civil Eng, 1993, 5(2): 155-169. [4] CAO H T, SIRIVIVATNANON V. Corrosion of steel in concrete with and without silica fume [J]. Cem Concr Res, 1991, 21(2/3): 316-324. [5] MANERA M, VENNESLAND ?, BERTOLINI L. Chloride threshold for rebar corrosion in concrete with addition of silica fume [J]. Corros Sci, 2008, 50(2): 554-560. [6] PAGE C L, HAVDAHL J. Electrochemical monitoring of corrosion of steel in microsilica cement pastes [J]. Mater Struct, 1985, 18(1): 41-47. [7] MONTEMOR M F, SIMOES A M P, SALTA M M. Effect of fly ash on concrete reinforcement corrosion studied by EIS [J]. Cem Concr Compos, 2000, 22(3): 175-185. [8] MANGAT P S, MOLLOY B T. Influence of PFA, slag and microsilica on chloride induced corrosion of reinforcement in concrete [J]. Cem Concr Res, 1991, 21(5): 819-834. [9] NOVAK P, MALA R, JOSKA L. Influence of pre-rusting on steel corrosion in concrete [J]. Cem Concr Res, 2001, 31(4): 589-593. [10] PROVERBIO E, CIGNA R. Influence of rebar surface condition of polarization resistance measurement in concrete structures [J]. Mater Sci Forum, 1995, 192-194: 877-882. [11] Al-TAYYIB A J, KHAN M S, ALLAM I M, et al. Corrosion behavior of pre-rusted rebars after placement in concrete [J]. Cem Concr Res, 1990, 20(6): 955-960. [12] HANSSON C M, SORENSEN B. The threshold concentration of chloride in concrete for the initiation of reinforcement corrosion, in "Corrosion Rates of Steel in Concrete, ASTM STP 1065" [M]. US: American Society for Testing and Materials, 1990: 3-16. [13] ANDRADE C, ALONSO C. Corrosion rate monitoring in the laboratory and on-site [J]. Construct Build Mater, 1996, 10(5): 315-28. [14] VIDEM K. Electrochemical studies of steel in cement mortar containing chloride and micro-silica [J]. Corros Sci, 2007, 49(4): 1702-1717. [15] MARCOTTE T D, HANSSON C M. The influence of silica fume on the corrosion resistance of steel in high performance concrete exposed to simulated sea water [J]. J Mater Sci, 2003, 38(23): 4765-4776. [16] 王绍东, 黄煜镔, 王智. 水泥组分对混凝土固化氯离子能力的影响[J]. 硅酸盐学报, 2000, 28(6): 570-574. WANG Shaodong, HUANG Yubin, WANG Zhi. J Chin Ceram Soc (in Chinese), 2000, 28(6): 570-574. [17] SONG H W, LEE C H, JUNG M S, et al. Development of chloride binding capacity in cement pastes and influence of the pH of hydration products [J]. Can J Civ Eng, 2008, 35(12): 1427-1434. [18] MAAGE M. The effect of silica fume on corrosion of steel reinforcement: a review [J]. ACI SP, 2001, 199: 477-496. [19] MANGAT P S, MOLLOY B T. Chloride binding in concrete containing PFA, gbs or silica fume under sea water exposure [J]. Mag Concr Res, 1995, 47(171): 129-141. [20] GRUBB J A, LIMAYE H S, KAKADE A M. Testing pH of concrete [J]. Concr Int, 2007, 29(4): 78-83. [21] LAMBERT P, PAGE C L, SHORT N R. Pore solution chemistry of the hydrated system tricalcium silicate/sodium chloride/water [J]. Cem Concr Res, 1985, 15(4): 675-680. [22] BYFORS K. Influence of silica fume and fly ash on chloride diffusion and pH values in cement paste [J]. Cem Concr Res, 1987, 17(1): 115- 130. [23] KISHAR E A, AHMED D A, MOHAMMED M R. Hydration of Portland cement in presence of silica fume [J]. Adv Cem Res, 2010, 22(3): 143-148. [24] KULAKOWSKI M P, PEREIRA F M, DAL-MOLIN D C C. Carbonation-induced reinforcement corrosion in silica fume concrete [J]. Constr Build Mater, 2009, 23(3): 1189-1195. [25] PAGE C L, VENNESLAND O. Pore solution composition and chloride binding capacity of silica-fume cement pastes [J]. Mater Struct, 1983, 16(19): 19-25. [26] BYFORS K, HANSSON C M, TRITTHART J. Pore solution expression as a method to determine the influence of mineral additives on chloride binding [J]. Cem Concr Res, 1986, 16(5): 760-770. [27] DOTTO J M R, ABREU A G, DAL MOLIN D C C, et al. Influence of silica fume addition on concretes physical properties and on corrosion behaviour of reinforcement bars [J]. Cem Concr Compos, 2004, 26(1): 31-39. [28] CHOI Y S, KIM J G, LEE K M. Corrosion behavior of steel bar embedded in fly ash concrete [J]. Corros Sci, 2006, 48(7): 1733-1745. [29] SUN Wei, ZHANG Yunsheng, LIU Sifeng, et al. The influence of mineral admixtures on resistance to corrosion of steel bars in green high- performance concrete [J]. Cem Concr Res, 2004, 34(10): 1781-1785. [30] SHEHATA M H, THOMAS M D A. Use of ternary blends containing silica fume and fly ash to suppress expansion due to alkali-silica reaction in concrete [J]. Cem Concr Res, 2002, 32(3): 341-349. [31] BODDY A M, HOOTON R D, THOMAS M D A. The effect of the silica content of silica fume on its ability to control alkali-silica reaction [J]. Cem Concr Res, 2000, 30(7): 1139-1150.

redirect unfaithful spouse why women cheat on men they love
read read here link
printable coupons for cialis outbackuav.com coupon for free cialis
服务与反馈:
文章下载】【加入收藏
中国硅酸盐学会《硅酸盐学报》编辑室
京ICP备10016537号-2
京公网安备 11010802024188号
地址:北京市海淀区三里河路11号    邮政编码:100831
电话:010-57811253  57811254    
E-mail:jccs@ceramsoc.com