The use of electrical impedance spectroscopy for monitoring the hydration products of Portland cement mortars with high percentage of pozzolans

被引：83
|
作者：
Cruz, J. M. [1 ]
Fita, I. C. [1 ]
Soriano, L. [2 ]
Paya, J. [2 ]
Borrachero, M. V. [2 ]
机构：
[1] Univ Politecn Valencia, Dept Fis Aplicada, Valencia 46022, Spain
[2] Univ Politecn Valencia, Inst Ciencia & Tecnol Hormigon, ICITECH, Valencia 46022, Spain
来源：
CEMENT AND CONCRETE RESEARCH | 2013年 / 50卷
关键词：
Electrical properties; Pozzolan; Fly ash; Metakaolin; PORE STRUCTURE; FLY-ASH; DIELECTRIC-PROPERTIES; CONDUCTIVITY; METAKAOLIN; MICROSTRUCTURE; CONCRETE; MODEL; PERMEABILITY; STRENGTH;
D O I：
10.1016/j.cemconres.2013.03.019
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
In this paper, mortars and pastes containing large replacement of pozzolan were studied by mechanical strength, thermogravimetric analysis (TGA), scanning electronic microscopy (SEM), mercury intrusion porosimetry (MIP) and electrical impedance spectroscopy (EIS). The effect of metakaolin (35%) and fly ash (60%) was evaluated and compared with an inert mineral addition (andalusite). The portlandite content was measured, finding that the pozzolanic reaction produced cementing systems with all portlandite fixed. The EIS measurements were analyzed by the equivalent electrical circuit (EEC) method. An EEC with three branches in parallel was applied. The dc resistance was related to the degree of hydration and allowed us to characterize plain and blended mortars. A constant phase element (CPE) quantified the electrical properties of the hydration products located in the solid-solution interface and was useful to distinguish the role of inert and pozzolanic admixtures present in the cement matrix. (c) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码：51 / 61
页数：11
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