基于介电常数的水泥基复合材料水化过程含水量测试与计算

徐文浩; 杨丽萍; 侯东伟

doi:10.3724/j.gyjzG24070701

基于介电常数的水泥基复合材料水化过程含水量测试与计算

doi: 10.3724/j.gyjzG24070701

1. 上海交通大学土木工程系, 上海 200240;
2. 上海市公共建筑与基础设施数字化运维重点实验室, 上海 200240

详细信息

作者简介:
徐文浩，主要从事高性能水泥基复合材料研究。

通讯作者:
侯东伟，houdw@sjtu.edu.cn。

计量
- 文章访问数: 26
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- PDF下载量: 0
- 被引次数: 0
出版历程
- 收稿日期: 2024-07-07
- 网络出版日期: 2026-07-06

Measurement and Calculation of Water Content in Hydrating Cement-Based Composites Using Dielectric Constant

1. Department of Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China;
2. Shanghai Key Laboratory for Digital Maintenance of Building and Infrastructure, Shanghai 200240, China

摘要

摘要: 为了描述水泥基材料水化过程中的含水量变化，基于平板电容理论搭建了水泥基材料介电常数监测体系，研究了介电常数与含水量的关系，并比较了不同水灰比和粉煤灰、硅灰、矿渣等矿物掺合料对水化耗水量的影响。结果表明：基于介电常数的含水量测量方法合理、准确；随着水化进行，含水量先快速降低，后趋于平缓；水灰比越大，早期水化速率越快，水化持续时间越长，耗水率越大；当水泥体系掺入粉煤灰后，耗水率随着掺量增加而减小，而硅灰相反；掺入矿渣会增大耗水量，但掺量增加时耗水量会减少。
- 复合凝胶材料 /
- 水化速率 /
- 介电常数 /
- 含水量
Abstract: In order to describe the changes in water content during the hydration process of cement-based materials， a monitoring system for the dielectric constant of cement-based materials was established based on the theory of parallel plate capacitance. The relationship between the dielectric constant and water content was investigated， and the effects of water-cement ratios and mineral admixtures such as fly ash， silica fume， and slag on the hydration water consumption were analyzed. The results indicated that the dielectric constant-based method was reasonable and accurate for determining water content. During the hydration of cement-based materials， the water content decreased rapidly at first， and then the rate of decrease slowed down. A higher water-cement ratio accelerated the early hydration rate and prolonged the hydration duration， which was characterized by a higher rate of water consumption. The incorporation of fly ash into the cement system reduced the water consumption rate as its dosage increased， whereas silica fume exhibited the opposite effect. Although slag generally enhanced the hydration rate and increased water consumption， a higher dosage of slag ultimately led to a reduction in water consumption.
- cementitious composites /
- hydration rate /
- dielectric constant /
- water content

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