| 摘要: |
| 将掺石灰石粉水泥基材料试件分别浸泡于(5±2)℃不同配比(质量比)的NaCl/Na2SO4复合溶液中，记录侵蚀过程中试件外观变化，测试试件强度，并对侵蚀后的腐蚀产物进行红外光谱分析和X射线衍射分析.结果表明：在纯Na2SO4溶液中浸泡的试件发生碳硫硅钙石型硫酸盐侵蚀(TSA)破坏，试件由表及里剥落，失去黏凝性.在NaCl/Na2SO4复合溶液中浸泡试件的TSA破坏程度随着Cl-浓度(质量浓度)的提高逐渐降低.Cl-降低碳硫硅钙石形成速度，进而减缓TSA破坏进程，Cl-浓度越高减缓效果越明显.Cl-对掺石灰石粉水泥基材料TSA的影响过程可分为3个阶段，即抑制阶段、衰退阶段及失效阶段. |
| 关键词: Cl- 碳硫硅钙石型硫酸盐侵蚀 水泥基材料 浓度 |
| DOI：103969/j.issn1007 9629201403023 |
| 分类号: |
| 基金项目:国家重点基础研究发展计划（973计划）项目（2009CB623106） |
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| Influences of Chloride Ions on Thaumasite Form of Sulfate Attack inCement Based Materials with Limestone Powder Added |
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LI Changcheng1, LI Shoudong2, BAI Yugui3
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1.State Key Laboratory of Green Building Materials, China Building Materials Academy, Beijing 100024, China;2.Guangzhou City Hengjian Engineering Detection Co., Ltd., Guangzhou 510310, China;3.CCCC Fourth Harbor Engineering Institute Co., Ltd., Guangzhou 510230, China
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| Abstract: |
| A research of low temperature sulfate/chloride attack was carried out to investigate the effect of chloride ion on thaumasite form of sulfate attack(TSA). The samples of cement based materials with limestone powder added were immersed in NaCl/Na2SO4 mixed solution with different mix proportions(by mass) at (5±2)℃. The appearance of sample was observed, its strength was tested. Besides, the corrosion products were analyzed by infrared spectrometry(IR) and X ray diffraction(XRD). The results show that the TSA in the sample immersed in pure Na2SO4 solution takes place, spalling of the sample from external to internal occurs, and the gelling property of the sample is lost. However, TSA erosion degree of the sample immersed in NaCl/Na2SO4 mixed solution gradually reduces with increasing chloride ion mass concentration. Chloride ion can slow down TSA process by reducing thaumasite formation rate. The effect of chloride ion on TSA can be divided into three stages:inhibition stage, decline stage and failure stage. |
| Key words: chloride ion thaumasite form of sulfate attack cement based material concentration |
