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Thermoporometry and Proton NMR Measurement on Cement Paste Equilibrated at Different Relative Humidities
Journal of Advanced Concrete Technology ( IF 2 ) Pub Date : 2020-08-12 , DOI: 10.3151/jact.18.456
Kiyofumi Kurumisawa 1 , Ole Mejlhede Jensen 2
Affiliation  

In this study, thermoporometry by differential scanning calorimetry and proton NMR measurements of hardened cement paste equilibrated under different humidity conditions were carried out, and the results of both measurements were compared. The results reveal that thermoporometry by low temperature DSC measurement cannot detect the water present in samples equilibrated at low relative humidity. On the other hand, it is possible to detect a signal at low relative humidity by proton NMR measurement. It is clarified that water strongly bound to the surface, which cannot be detected by low temperature DSC, exists at a relative humidity of 33% or less. If it is relevant to detect tightly held water, such as water present in the fine gel pores, it is recommended to apply proton NMR measurements. This paper is an extended English version of the authors’ previous work [Kurumisawa, K. and Jensen, O. M., (2020). “Measurement of cement paste at different humidities by thermoporometry and proton NMR.” Proceedings of the Japan Concrete Institute, 42, 347-352. (in Japanese)].



中文翻译:

在不同相对湿度下平衡水泥浆的热孔法和质子核磁共振测量

在这项研究中,通过差示扫描量热法进行的热孔法和质子核磁共振测量在不同湿度条件下平衡的硬化水泥浆,并比较了两次测量的结果。结果表明,通过低温DSC测量的热孔隙率法无法检测到在相对湿度较低时平衡的样品中存在的水。另一方面,可以通过质子NMR测量在低相对湿度下检测信号。可以清楚地发现,牢固结合在表面上的水在33%以下的相对湿度下存在,这是低温DSC无法检测到的。如果要检测紧紧存在的水(例如细凝胶孔中存在的水),建议使用质子NMR测量。本文是作者先前工作的扩展英语版本[Kurumisawa,K.和Jensen,OM,(2020)。“通过热孔法和质子NMR在不同湿度下测量水泥浆。”日本混凝土学会会刊,42,347-352。(日语)]。

更新日期:2020-08-23
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