TY - JOUR
T1 - Investigating drying behavior of cement mortar through electrochemical impedance spectroscopy analysis
AU - Sun, Hongfang
AU - Ren, Zhili
AU - Memon, Shazim Ali
AU - Zhao, Diandian
AU - Zhang, Xiaogang
AU - Li, Dawang
AU - Xing, Feng
N1 - Funding Information:
The research work described in this paper was supported by the Chinese National Natural Science Foundation (Grant Nos. 51408364, 51520105012, 51278303, and 51278304), the Natural Science Foundation of SZU (Grant No. 000114), and Shenzhen R&D Fund (Grant No. JCYJ20140418091413530). We also thank the Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, College of Civil Engineering, Shenzhen University for providing facilities and equipments.
PY - 2017/3/15
Y1 - 2017/3/15
N2 - In this research, electrochemical impedance measurements were taken on cement mortar with different levels of drying. The impedance spectrum was analyzed with equivalent circuit model, through which the drying behavior was investigated. A model considering resistivity distribution along the drying direction was proposed. For drying of mortar, two different schemes (direct drying and ethanol-pretreated drying) were adopted. Moreover, the influence of hydration time of mortar on drying was also evaluated. Test results showed that the proposed model fitted well with both symmetric and asymmetric spectra for different levels of drying. For cement mortar directly dried at 50 °C for different durations (1, 4, 24, and 48 h), the peak resistivity and drying depth increased with drying time. The ethanol-pretreated mortar showed similar behavior. Moreover, the hydration time of cement mortar was another important factor to influence the drying depth. The proposed model for electrochemical impedance spectrum interpretation provides a low-cost and effective non-destructive approach for understanding the drying behavior of cementitious system.
AB - In this research, electrochemical impedance measurements were taken on cement mortar with different levels of drying. The impedance spectrum was analyzed with equivalent circuit model, through which the drying behavior was investigated. A model considering resistivity distribution along the drying direction was proposed. For drying of mortar, two different schemes (direct drying and ethanol-pretreated drying) were adopted. Moreover, the influence of hydration time of mortar on drying was also evaluated. Test results showed that the proposed model fitted well with both symmetric and asymmetric spectra for different levels of drying. For cement mortar directly dried at 50 °C for different durations (1, 4, 24, and 48 h), the peak resistivity and drying depth increased with drying time. The ethanol-pretreated mortar showed similar behavior. Moreover, the hydration time of cement mortar was another important factor to influence the drying depth. The proposed model for electrochemical impedance spectrum interpretation provides a low-cost and effective non-destructive approach for understanding the drying behavior of cementitious system.
KW - Drying
KW - Electrochemical impedance spectroscopy
KW - Mortar
KW - Resistivity
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U2 - 10.1016/j.conbuildmat.2016.12.196
DO - 10.1016/j.conbuildmat.2016.12.196
M3 - Article
AN - SCOPUS:85009083899
VL - 135
SP - 361
EP - 368
JO - Construction and Building Materials
JF - Construction and Building Materials
SN - 0950-0618
ER -