合成水化硅酸钙(C-S-H)对水泥基材料Cl- 结合性能的影响

doi:10.11902/1005.4537.2023.058

中国腐蚀与防护学报

2024, Vol. 44

Issue (1): 197-203 CSTR: 32134.14.1005.4537.2023.058 DOI: 10.11902/1005.4537.2023.058

研究报告

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合成水化硅酸钙(C-S-H)对水泥基材料Cl^- 结合性能的影响

张余果¹^,²^,³, 孙丛涛¹^,²^,³(

), 张鹏¹, 孙明²^,³, 耿圆洁³^,⁴, 樊亮²^,³, 翟晓凡²^,³, 段继周²^,³

^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.崂山实验室海洋腐蚀与防护开放工作室青岛 266237
^4.内蒙古科技大学土木工程学院包头 014010

Effect of Synthetic Calcium Silicate Hydrate (C-S-H) on Combination of Chloride Ions with Cementitious Materials

ZHANG Yuguo¹^,²^,³, SUN Congtao¹^,²^,³(

), ZHANG Peng¹, SUN Ming²^,³, GENG Yuanjie³^,⁴, FAN Liang²^,³, ZHAI Xiaofan²^,³, DUAN Jizhou²^,³

^1.School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China
^2.Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
^3.Open Studio for Marine Corrosion and Protection, Laoshan Laboratory, Qingdao 266237, China
^4.School of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China

引用本文:

张余果, 孙丛涛, 张鹏, 孙明, 耿圆洁, 樊亮, 翟晓凡, 段继周. 合成水化硅酸钙(C-S-H)对水泥基材料Cl^- 结合性能的影响[J]. 中国腐蚀与防护学报, 2024, 44(1): 197-203.
Yuguo ZHANG, Congtao SUN, Peng ZHANG, Ming SUN, Yuanjie GENG, Liang FAN, Xiaofan ZHAI, Jizhou DUAN. Effect of Synthetic Calcium Silicate Hydrate (C-S-H) on Combination of Chloride Ions with Cementitious Materials[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(1): 197-203.

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摘要:

通过合成水化硅酸钙(C-S-H)，研究了内掺C-S-H对水泥净浆Cl^-结合性能的影响。采用XRD、TG-DTG、SEM以及EDS分析了水泥水化产物随龄期的物相演化和微观形貌变化。结果表明，净浆试件中自由Cl^-含量随龄期的增加皆呈先下降后上升的趋势。在龄期7、14和21 d时，掺加C-S-H组净浆自由Cl^-含量均大于未掺加C-S-H组，这是因为掺加的C-S-H粒径相对较大，比表面积相对较小，使得净浆中C-S-H总比表面积减小，降低了C-S-H对Cl^-的结合；其次，在水泥净浆中掺加C-S-H能够促进水泥水化，提高水化早期pH值，高pH值也不利于C-S-H对Cl^-的吸附；再次，掺加C-S-H净浆水化早期无Friedel's盐生成，化学结合Cl^-能力较弱。在龄期28 d时，掺加C-S-H组净浆中有Friedel's盐的生成，化学结合提高了Cl^-结合量，故两组净浆自由Cl^-含量较为相近。由于28 d时掺加C-S-H组净浆中存在较多SiO₂，易发生火山灰反应生成低钙硅比的C-S-H以及pH值降低影响Friedel's盐稳定性，使得35 d时自由Cl^-含量上升明显。

关键词 ：水泥净浆, Cl^-, 水化硅酸钙, Cl^-结合, pH值

Abstract：

Mixtures of cement-based material with the addition of synthetic calcium silicate hydrated (C-S-H) was prepared, then the effect of internal admixture of C-S-H on the evolution of the combination of chloride ions with the cement paste during aging process was investigated by means of XRD, TG-DTG, SEM and EDS. The results showed that the quantity of free chloride ions in the test pieces tended to decrease and then increase with aging process. At the ages of 7, 14 and 21 d, the quantity of free chloride ions in the cement paste with C-S-H was higher than that without C-S-H. This was due to the relatively larger particle size and smaller specific surface area of C-S-H, which reduced the total specific surface area of C-S-H in the cement paste and reduced the combination amount of C-S-H to chloride ions; in addition, the addition of C-S-H to the cement paste could promote the hydration of cement and increase the pH value in the early hydration period, and the high pH value is not conducive to the adsorption of C-S-H on chloride ions; and there is no Friedel's salt generation in the early hydration period of the cement paste mixed with C-S-H, so that weaken the chemical combination ability for chloride ions. At the age of 28 d, Friedel's salt was generated in the cement paste with addition of C-S-H, thus the amount of chemical combination of chloride ions increased, so the free chloride ion quantity of the two groups of cement paste was more similar. Due to more SiO₂ existed in the cement paste with C-S-H at 28 d, the pozzolanic reaction to generate C-S-H with low Ca/Si and the decrease in pH value affecting Friedel's salt stability, the amount of free chloride ions increased significantly at 35 d.

Key words： cement paste chloride ions calcium silicate hydration chloride binding pH value

收稿日期: 2023-03-06 32134.14.1005.4537.2023.058

ZTFLH:

TU528.01

基金资助:山东省自然科学基金重点项目(ZR2020KE046);国家重大科研仪器研制项目(41827805)

通讯作者: 孙丛涛，E-mail:suncongtao@qdio.ac.cn，研究方向为钢筋混凝土的耐久性

Corresponding author: SUN Congtao, E-mail: suncongtao@qdio.ac.cn

作者简介: 张余果，女，1997年生，硕士生

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https://www.jcscp.org/CN/10.11902/1005.4537.2023.058 或 https://www.jcscp.org/CN/Y2024/V44/I1/197

图1 合成的C-S-H粉末形貌

图2 合成的C-S-H粉体粒径分布

图3 合成的C-S-H粉末的红外光谱图

表1 水泥试件中C-S-H添加比例 (mass fraction / %)

图4 水泥净浆自由Cl-含量随龄期变化规律

图5 水泥净浆pH值随龄期变化规律

图6 水泥净浆各龄期的X射线衍射图谱

图7 水泥净浆各龄期的热重分析曲线

图8 水泥净浆各龄期的SEM像与EDS图谱

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