Investigation of moisture transport in cement-based materials using low-field nuclear magnetic resonance imaging

Zhao Haitao; Wu Xia; Huang Yuyu; Zhang Peng; Tian Qian; Liu Jiaping

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Investigation of moisture transport in cement-based materials using low-field nuclear magnetic resonance imaging

机译：使用低场核磁共振成像对水泥基材料的水分运输研究

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Moisture transport has a great impact on concrete durability. In this study, a hard-pulse one-dimensional frequency coding sequence of low-field nuclear magnetic resonance (LF-NMR) imaging was applied to investigate moisture transport in cement-based materials (CBMs) considering the influences of the water/binder (w/b) ratio, sand/cement (s/c) ratio and contents of silica fume (SF) and super-absorbent polymer (SAP). A weighing method was also applied and the results were compared with the LF-NMR imaging measurements. The results showed that the moisture distribution curves can be divided into three stages by height. In addition, it was found that the moisture absorption height (h) increased with time and the growth rate of water absorption proceeded from fast to slow. Additionally, as the w/b ratio of the sample was increased, h increased. The value of h decreased with increasing s/c ratio and increased with an increase in SF content. When SAP was mixed into the CBMs, the values of h increased with 0.15% SAP addition but decreased with the addition of 0.30% SAP. The LF-NMR imaging measurements were in agreement with the results of the weighing method.

机译：水分运输对混凝土耐久性产生了很大影响。在该研究中，考虑到水/粘合剂的影响（基于水/粘合剂的影响，施加低场核磁共振（LF-NMR）成像的硬脉冲一维频率编码序列以研究水泥基材料（CBMS）（ W / B）比例，砂/水泥（S / C）比和二氧化硅烟气（SF）和超吸收性聚合物（SAP）的含量。还应用了称重方法，并将结果与LF-NMR成像测量进行了比较。结果表明，水分分布曲线可以分为三个阶段。此外，发现水分吸收高度（h）随时间的增加，吸水率的生长速度从快速进行缓慢。另外，随着样品的w / B比增加，H增加。 H的值随着S / C比的增加而降低，随着SF含量的增加而增加。将SAP混合到CBMS中时，H值增加0.15％SAP添加，但加入0.30％SAP。 LF-NMR成像测量与称重方法的结果一致。

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来源
《Magazine of Concrete Research》 |2021年第6期|252-270|共19页
作者
Zhao Haitao; Wu Xia; Huang Yuyu; Zhang Peng; Tian Qian; Liu Jiaping;
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作者单位

Hohai Univ Coll Civil & Transportat Engn Nanjing Peoples R China;

Hohai Univ Coll Civil & Transportat Engn Nanjing Peoples R China;

CSCEC AECOM Consultants Co Ltd Nanjing Peoples R China;

Qingdao Univ Technol Sch Civil Engn Qingdao Peoples R China;

Jiangsu Res Inst Bldg Sci Nanjing Peoples R China|State Key Lab High Performance Civil Engn Mat Nanjing Peoples R China;

State Key Lab High Performance Civil Engn Mat Nanjing Peoples R China|Southeast Univ Coll Mat Sci & Engn Nanjing Peoples R China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类
关键词
cement; cementitious materials; durability-related properties; moisture-related properties;

机译：水泥;水泥材料;耐久性相关性质;水分相关性质;

Investigation of moisture transport in cement-based materials using low-field nuclear magnetic resonance imaging

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