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CLDB  2017, Vol. 31 Issue (23): 132-137    https://doi.org/10.11896/j.issn.1005-023X.2017.023.019
  专题栏目:超高性能混凝土及其工程应用 |
超高性能水泥基材料复合盐侵蚀研究:合成Friedel盐和钙矾石在硫酸盐和氯盐溶液中的稳定性*
郭丽萍1, 2, 3, 张健1, 曹园章1, 臧文洁1
1 东南大学材料科学与工程学院,南京211189;
2 江苏省土木工程材料重点实验室,南京211189;
3 先进土木工程材料协同创新中心,南京211189
A Study for Compound Salts Attack on Ultra-high Performance Cement-based Materials: the Stabilities of Chemically Synthesized Friedel Salt and Ettringite in Solutions of Sulfates and Chloride Salts
GUO Liping1, 2, 3, ZHANG Jian1, CAO Yuanzhang1, ZANG Wenjie1
1 School of Materials Science and Engineering, Southeast University, Nanjing 211189;
2 Jiangsu Key Laboratory of Construction Materials, Nanjing 211189;
3 Collaborative Innovation Center for Sustainable Civil Engineering Materials & Structures, Nanjing 211189;
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摘要 化学合成了氯离子在水泥基材料中的主要侵蚀产物Friedel盐(3CaO·Al2O3·CaCl2·10H2O)以及硫酸根离子在水泥基材料中的主要侵蚀产物钙矾石(3CaO·Al2O3·3CaSO4·32H2O),采用XRD和综合热分析(TG-DSC)研究了二者的稳定性与转变机理,通过浸泡实验探究不同侵蚀性离子之间相互作用对水泥基材料的影响。结果表明:硫酸盐对Friedel盐稳定性影响显著,硫酸根离子置换Friedel盐中的氯离子,并最终生成钙矾石;氯盐对钙矾石的稳定性也有影响,氯盐同样可以使钙矾石分解。两种腐蚀产物之间存在平衡,并且在一定条件下可以相互转化。实验证实氯盐与硫酸盐复合溶液对水泥混凝土侵蚀过程中存在复杂的离子交互作用。
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郭丽萍
张健
曹园章
臧文洁
关键词:  Friedel盐  钙矾石  复合盐  转化  交互作用  硫酸盐  氯盐    
Abstract: Pure Friedel salt (3CaO·Al2O3·CaCl2·10H2O, main corrosion product of cement-based materials by chloride ions) and ettringite (AFt, 3CaO·Al2O3·3CaSO4·32H2O, main corrosion product of cement-based materials by sulfate ions) were chemically synthesized and then characterized via X-ray diffraction and TG-DSC test to investigate their stabilities and transform mechanism. The interaction between different corrosion ions was explored by immersion experiment. The results indicated that sulfates have a significant impact on Friedel salt, as sulfate ions can substitute for chloride ions in Friedel salt and convert Friedel salt into ettringite. Chloride salts can also react with ettringite, leading to ettringite's decomposition. There is an equilibrium between Friedel salt and ettringite, and the inter-transform of them can be achieved under certain conditions. The study verified the interaction effect during the corrosion process of the compound solution of chloride salt and sulfate toward hardened cement paste.
Key words:  Friedel salt    ettringite    compound salt solution    transformation    interaction    sulfate    chloride
               出版日期:  2017-12-10      发布日期:  2018-05-08
ZTFLH:  TU528  
基金资助: *国家重点研发计划(2015CB655102); 国家自然科学基金(51378113; 51778133); 江苏省“六大人才高峰”第十二批高层次人才B类(JZ-004)
作者简介:  郭丽萍:女,副教授,博士研究生导师,研究方向为水泥混凝土耐久性和高延性混凝土 E-mail:guoliping691@163.com
引用本文:    
郭丽萍, 张健, 曹园章, 臧文洁. 超高性能水泥基材料复合盐侵蚀研究:合成Friedel盐和钙矾石在硫酸盐和氯盐溶液中的稳定性*[J]. CLDB, 2017, 31(23): 132-137.
GUO Liping, ZHANG Jian, CAO Yuanzhang, ZANG Wenjie. A Study for Compound Salts Attack on Ultra-high Performance Cement-based Materials: the Stabilities of Chemically Synthesized Friedel Salt and Ettringite in Solutions of Sulfates and Chloride Salts. Materials Reports, 2017, 31(23): 132-137.
链接本文:  
http://www.mater-rep.com/CN/10.11896/j.issn.1005-023X.2017.023.019  或          http://www.mater-rep.com/CN/Y2017/V31/I23/132
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