J. Chalupová, J. Němeček, V. Hybášek, V. Pommer, J. Němeček
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引用次数: 0
摘要
孔隙率是水泥浆体微观结构的重要组成部分，对水泥基材料的力学性能(尤其是耐久性和强度)有重要影响。电化学阻抗谱(EIS)是一种非破坏性的方法，它利用一系列频率的电流来测量孔隙系统，这些电流由不锈钢电极馈送到水泥浆体中。孔隙体积由EIS测量的孔隙电阻和基质电容得到。本文基于EIS对纯CEM I 42.5R波特兰水泥浆样在3个不同水化时间(龄期7、14、28天)的阻力值进行孔隙度评估。
Measurement and evaluation of cement paste porosity by electrochemical impedance spectroscopy
Porosity is an important part of cement paste microstructure, which significantly influences the mechanical properties (especially durability and strength) of cement-based materials. Electrochemical impedance spectroscopy (EIS) is a non-destructive method used to measure the pore system utilizing a range of frequencies of electric current, which is fed to the cement paste by stainless steel electrodes. The pore volume is obtained from the pore resistance and the matrix capacitance measured by EIS. This paper deals with the evaluation of porosity based on resistance values from EIS on a sample of pure CEM I 42.5R Portland cement paste at 3 different hydration times (age 7, 14, 28 days).
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