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基于直流阶跃暂态电阻法的混凝土渗透性表征
CSTR:
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作者:
作者单位:

1.重庆大学材料科学与工程学院;2.中冶建筑研究总院有限公司

中图分类号:

TU528.572

基金项目:

重庆市技术创新与应用示范专项


Permeability Characterization of Concrete Based on the DC-Step Transient Resistance Method
Author:
Affiliation:

1.College of Materials Science and Engineering,Chongqing University;2.Central Research Institute of Building and Construction,MCC Group Co,Ltd

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  • 参考文献 [28]
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    摘要:

    渗透性是影响混凝土耐久性的最重要指标，当前工程中所用混凝土渗透性试验方法，不管是水渗透性还是氯离子渗透性，其测试过程都存在耗时长、操作不便的缺点。为解决混凝土渗透性实时、原位监测的问题，本文利用基于直流阶跃法的暂态电阻表征混凝土渗透性评价技术研究。分析了水胶比、矿物掺合料掺量、混凝土饱水度、环境温度等不同因素对各龄期混凝土暂态电阻率的影响规律，将暂态电阻率与混凝土各龄期的强度、吸水速率、抗水渗透性、抗氯离子渗透性等性能建立联系，结果显示暂态电阻法测试结果与现有混凝土渗透性方法测试结果具有较高的关联性，提出了暂态电阻法测试结果用于混凝土渗透性评价的推荐值，验证了暂态电阻法可用于评价混凝土抗渗透性。

    Abstract:

    Permeability is the most important index affecting the durability of concrete. At present, the test methods of concrete permeability, whether water permeability or chloride permeability, have the disadvantages of time-consuming and operation inconvenience. To solve the problem of real-time and in situ monitoring of concrete permeability, this paper studied the evaluation technology of concrete permeability by transient resistance based on DC step input. The influences of different water-binder ratios, mineral admixtures, water saturation, and ambient temperature on the electrical resistivity of concrete were researched. The relationships between the resistivity and the strength, capillary water absorption rate, water permeability, and chloride permeability resistance were analyzed. The results show a good association between the transient resistance test and current permeability methods. The recommended values of transient resistance for evaluation of concrete permeability are proposed, and it is verified that the transient resistance can be used to evaluate the permeability of concrete.

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  • 收稿日期:2021-09-03
  • 最后修改日期:2021-10-27
  • 录用日期:2021-11-19
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