氯离子掺入方式及偏高岭土对砂浆氯离子结合性能的影响

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (4): 1154-1161.

氯离子掺入方式及偏高岭土对砂浆氯离子结合性能的影响

孙明^1,2,3, 孙丛涛^1,2,3,4, 张鹏¹, 麻福斌^2,3,4, 李言涛^2,3,4, 段继周^2,3,4

1.青岛理工大学土木工程学院,青岛 266033;
2.中国科学院海洋研究所海洋环境腐蚀与生物污损重点实验室,青岛 266071;
3.青岛海洋科学与技术国家实验室海洋腐蚀与防护开放工作室,青岛 266237;
4.中国科学院海洋大科学研究中心,青岛 266071

收稿日期:2020-12-06 修回日期:2021-01-12 出版日期:2021-04-15 发布日期:2021-05-11
通讯作者: 孙丛涛,博士,高工。E-mail:suncongtao@qdio.ac.cn
作者简介:孙明(1996—),男,硕士研究生。主要从事混凝土耐久性方面的研究。E-mail:sunmingfx@163.com
基金资助:
国家自然科学基金青年基金(51708541);国家重大科研仪器研制项目(41827805);中国科学院战略性先导科技专项子课题(XDA13040402);南通基础科学研究计划(JC2020125)

Effects of Chloride Introduced Way and Metakaolin on Chloride Binding Capacity of Mortar

SUN Ming^1,2,3, SUN Congtao^1,2,3,4, ZHANG Peng¹, MA Fubin^2,3,4, LI Yantao^2,3,4, DUAN Jizhou^2,3,4

1. School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China;
2. Key Laboratory of Marine EnvironmentalCorrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;
3. Open Studio for Marine Corrosion and Protection, Qingdao National Laboratory for Marine Science and Technology,Qingdao 266237, China;
4. Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China

Received:2020-12-06 Revised:2021-01-12 Online:2021-04-15 Published:2021-05-11

摘要/Abstract

摘要： 通过模拟海砂与拌合水将相同含量的氯离子引入砂浆,研究了氯离子掺入方式及偏高岭土对氯离子结合性能的影响。采用能谱仪(EDS)分析了砂浆中氯离子含量分布,使用X射线衍射(XRD)及微商热重法(DTG)分析了水化产物的变化,采用压汞法(MIP)分析了砂浆孔隙结构的变化。结果表明,海砂型氯离子存在从砂粒表面向胶凝材料扩散的过程,而拌合水引入氯离子在砂浆中分布较为均匀。龄期1 d时,砂浆对海砂型氯离子结合性能低于拌合水引入氯离子;龄期28 d时,两种内掺型氯离子结合性能趋于一致。偏高岭土加速早期水泥水化反应,会促进砂浆对拌合水引入氯离子的结合。随偏高岭土掺量的增加,Friedel’s盐及Ca(OH)₂含量逐渐减少。20%与30%(质量分数)偏高岭土掺量下,拌合水引入氯离子对孔隙结构的细化效果更为显著。

关键词: 氯离子掺入方式, 偏高岭土, 氯离子结合, Friedel’s盐, 孔隙结构

Abstract: The same amount of chloride ions was introduced to mortars by simulated sea sand and mixed water respectively. The effects of chloride introduced way and metakaolin on chloride binding capacity were analyzed. And the corresponding test methods were used to analyze the different aspects: energy disperse spectroscopy (EDS) was conducted to analyze the distribution of chloride content; the change of hydration product was analyzed by X-ray diffraction (XRD) and derivative thermogravimetric method (DTG); the change of pore structure was evaluated by mercury intrusion porosimetry (MIP). The results show that there is a diffusion process of chloride ions from surface of sea sand to cementitious materials, and that chloride ions introduced by mixed water distribute evenly in mortar. The chloride binding capacity in mortar at different ages was discussed. The chloride binding capacity in mortar made with sea sand is lower than that made with mixed water at 1 d age, but these two chloride binding capacities tend to be same at 28 d age. The acceleration of metakaolin on early cement hydration reaction promotes the binding process of chloride ions introduced by mixed water. The content of Friedel’s salt and Ca(OH)₂ decreases with the increase of metakaolin content. The chloride ions introduced by mixed water has a better refinement effect on pore structure at 20% and 30% (mass fraction) metakaolin content.

Key words: chloride introduced way, metakaolin, chloride binding, Friedel’s salt, pore structure

中图分类号:

TU528

孙明, 孙丛涛, 张鹏, 麻福斌, 李言涛, 段继周. 氯离子掺入方式及偏高岭土对砂浆氯离子结合性能的影响[J]. 硅酸盐通报, 2021, 40(4): 1154-1161.

SUN Ming, SUN Congtao, ZHANG Peng, MA Fubin, LI Yantao, DUAN Jizhou. Effects of Chloride Introduced Way and Metakaolin on Chloride Binding Capacity of Mortar[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(4): 1154-1161.

参考文献

[1] QU Z Y, YU Q L, BROUWERS H J H. Relationship between the particle size and dosage of LDHs and concrete resistance against chloride ingress[J]. Cement and Concrete Research, 2018, 105: 81-90.
[2] MA B G, LIU X H, TAN H B, et al. Utilization of pretreated fly ash to enhance the chloride binding capacity of cement-based material[J]. Construction and Building Materials, 2018, 175: 726-734.
[3] YUAN Q, SHI C J, DE SCHUTTER G, et al. Chloride binding of cement-based materials subjected to external chloride environment: a review[J]. Construction and Building Materials, 2009, 23(1): 1-13.
[4] YANG Z Q, SUI S Y, WANG L G, et al. Improving the chloride binding capacity of cement paste by adding nano-Al₂O₃: the cases of blended cement pastes[J]. Construction and Building Materials, 2020, 232: 117219.
[5] XU Q, JI T, YANG Z X, et al. Preliminary investigation of artificial reef concrete with sulphoaluminate cement, marine sand and sea water[J]. Construction and Building Materials, 2019, 211: 837-846.
[6] LIU W, CUI H Z, DONG Z J, et al. Carbonation of concrete made with dredged marine sand and its effect on chloride binding[J]. Construction and Building Materials, 2016, 120: 1-9.
[7] WANG Y Y, SHUI Z H, GAO X, et al. Modification on the chloride binding capacity of cementitious materials by aluminum compound addition[J]. Construction and Building Materials, 2019, 222: 15-25.
[8] LIU X H, MA B G, TAN H B, et al. Chloride immobilization of cement-based material containing nano-Al₂O₃[J]. Construction and Building Materials, 2019, 220: 43-52.
[9] 刘志鹏.碳化对海砂混凝土中氯离子固化及钢筋锈蚀行为的影响[D].深圳:深圳大学,2018.
LIU Z P. Effect of carbonation on chloride binding and rebar corrosion of concrete made with marine sand[D]. Shenzhen: Shenzhen University, 2018 (in Chinese).
[10] 刘军,董必钦,邢锋,等.海砂氯离子与水泥胶体结合的模拟实验与结合机理[J].硅酸盐学报,2009,37(5):862-866+876.
LIU J, DONG B Q, XING F, et al. Simulation experiment and mechanism of the combining of sea sand type chlorine ions in cement materials[J]. Journal of the Chinese Ceramic Society, 2009, 37(5): 862-866+876 (in Chinese).
[11] DOUSTI A, BEAUDOIN J J, SHEKARCHI M. Chloride binding in hydrated MK, SF and natural zeolite-lime mixtures[J]. Construction and Building Materials, 2017, 154: 1035-1047.
[12] ZIBARA H, HOOTON R D, THOMAS M D A, et al. Influence of the C/S and C/A ratios of hydration products on the chloride ion binding capacity of lime-SF and lime-MK mixtures[J]. Cement and Concrete Research, 2008, 38(3): 422-426.
[13] 潘从玲,储洪强,蒋林华,等.氯盐-硫酸盐共存环境中阳离子类型对氯离子结合能力的影响[J].混凝土,2019(4):28-32+36.
PAN C L, CHU H Q, JIANG L H, et al. Influence of cation types on binding capacity of chloride in chloride-sulfate coexistent environment[J]. Concrete, 2019(4): 28-32+36 (in Chinese).
[14] 刘军,邢锋,董必钦,等.采用河砂模拟海砂的试验方法研究[J].混凝土,2008(9):62-63+66.
LIU J, XING F, DONG B Q, et al. Test-method of using river sand as simulated sea sand[J]. Concrete, 2008(9): 62-63+66 (in Chinese).
[15] YANG Z Q, GAO Y, MU S, et al. Improving the chloride binding capacity of cement paste by adding nano-Al₂O₃[J]. Construction and Building Materials, 2019, 195: 415-422.
[16] 孙丛涛,宋华,牛荻涛,等.粉煤灰混凝土的氯离子结合性能[J].建筑材料学报,2016,19(1):35-39.
SUN C T, SONG H, NIU D T, et al. Chloride binding capacity of fly ash concrete[J]. Journal of Building Materials, 2016, 19(1): 35-39 (in Chinese).
[17] CHANG H L. Chloride binding capacity of pastes influenced by carbonation under three conditions[J]. Cement and Concrete Composites, 2017, 84: 1-9.
[18] 余强,曾俊杰,范志宏,等.偏高岭土和硅灰对混凝土性能影响的对比分析[J].硅酸盐通报,2014,33(12):3134-3139.
YU Q, ZENG J J, FAN Z H, et al. Comparative analysis on influence of metakaolin and silica fume on concrete[J]. Bulletin of the Chinese Ceramic Society, 2014, 33(12): 3134-3139 (in Chinese).
[19] 谢春磊,张洪伟,赵晓亮,等.粉煤灰-偏高岭土-石粉对混凝土微结构及早期收缩的影响研究[J].硅酸盐通报,2017,36(9):3075-3081.
XIE C L, ZHANG H W, ZHAO X L, et al. Effects of component admixtures based on fly ash, metakaolin and limestone powder on microstructure and early age shrinkage of concrete[J]. Bulletin of the Chinese Ceramic Society, 2017, 36(9): 3075-3081 (in Chinese).
[20] FLOREA M V A, BROUWERS H J H. Chloride binding related to hydration products: part I: ordinary Portland cement[J]. Cement and Concrete Research, 2012, 42(2): 282-290.
[21] 王小刚,史才军,何富强,等.氯离子结合及其对水泥基材料微观结构的影响[J].硅酸盐学报,2013,41(2):187-198.
WANG X G, SHI C J, HE F Q, et al. Chloride binding and its effects on microstructure of cement-based materials[J]. Journal of the Chinese Ceramic Society, 2013, 41(2): 187-198 (in Chinese).