水泥浆体内游离态亚硝酸根含量的影响因素研究
PDF下载 (332)舒海斌,戴燕华,柳俊哲,宋屹林.水泥浆体内游离态亚硝酸根含量的影响因素研究[J].宁波大学学报(理工版),2019,32(4):102-108.DOI:
SHU Haibin,DAI Yanhua,LIU Junzhe,SONG Yilin.Influencing factors of free nitrite ion content in cement paste[J].Journal of Ningbo University(Natural Science & Engineering Edition),2019,32(4):102-108.DOI:
| Title: | Influencing factors of free nitrite ion content in cement paste |
| 作者: | 舒海斌, 戴燕华, 柳俊哲, 宋屹林 |
| Author(s): | SHU Haibin, DAI Yanhua, LIU Junzhe, SONG Yilin |
| 关键词: | 水泥浆; 游离态亚硝酸根离子; 影响因素 |
| Keywords: | NO2-AFm; cement paste; free nitrite ion; influence factor |
| 分类号: | TU528.1 |
| 文献标识码: | A |
| 摘要: | 混凝土中游离态NO2-含量是钢筋阻锈的主要因素, 本文通过测定游离态NO2-含量和水化产物的组成, 评价了水泥浆体内游离态NO2-含量对钢筋的影响因素. 结果表明: 养护龄期越长, 游离态NO2-含量越低, 早期游离态NO2-含量下降速率较快, 后期趋于平缓, 且生成NO2-AFm化合物; 养护温度越高, 游离态NO2-含量越低, 离子固化率越高, 对早期离子固化速率的影响尤为明显; 水灰比越大, 游离态NO2-含量越小, 水泥浆试件内的游离态NO2-在养护后期仍持续固化, 而水灰比较小的试件在后期固化速率变慢; 随着亚硝酸盐掺量的增加, 水泥浆体中游离态和固化态的NO2-含量均随之增加, 但固化率却随掺量的增加而减少. |
| Abstract: | The free NO2- content in concrete is the main factor of steel rust resistance. In this paper, the influence factors of free NO2- content in cement paste were evaluated by measuring the content of free NO2- and the composition of hydration products. The results showed that the longer the curing age is, the lower the free NO2- content becomes. The velocity of decay of NO2- content in the early stage is rapid and it tends to be slow in the later stage, and the NO2-AFm compounds are also formed. The higher the curing temperature is, the lower the free NO2- content becomes, the higher the ion curing rate is, and the more obvious the influence on the early ionic solidification velocity. The larger the W/C is, the smaller the free NO2- content becomes. The NO2- in cement paste is still solidified in the late stage of hydration, while the ionic solidification velocity of the specimens with relatively small W/C becomes slower. With the increasing of nitrite content, the content of NO2- in the free and solid state of the cement paste increases accordingly, but the solidification rate decreases. |
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| 备注/Memo: | 收稿日期: 2018－09－11. 宁波大学学报（理工版）网址: http://journallg.nbu.edu.cn/基金项目: 国家自然科学基金（51778302）.第一作者: 舒海斌（1994－）, 男, 浙江宁波人, 在读硕士研究生, 主要研究方向: 混凝土结构耐久性. E-mail: pualbinbin@163.com*通信作者: 柳俊哲（1964－）, 男, 黑龙江五常人, 博导/教授, 主要研究方向: 混凝土结构耐久性. E-mail: liujunzhe@nbu.edu.cn 宁波大学学报（理工版）网址：http://journallg.nbu.edu.cn/ |
