Evolution of Electrochemical Impedance Spectra Characteristics of Cementitious Materials after Capturing Carbon Dioxide

Qiong Liu, Huilin Tang, Lin Chi (), Kailun Chen (), Lei Zhang and Chaoxiong Lu
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Qiong Liu: School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
Huilin Tang: School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
Lin Chi: School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
Kailun Chen: School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
Lei Zhang: Hebei Expressway Jingxiong Preparation Office, Baoding 071000, China
Chaoxiong Lu: Hebei Expressway Jingxiong Preparation Office, Baoding 071000, China

Sustainability, 2023, vol. 15, issue 3, 1-17

Abstract: The electrochemical parameters of cement-based materials with different water–cement ratios in carbon curing and water curing were measured with electrochemical impedance spectroscopy (EIS). The optimized circuit model and corresponding electrical parameters were obtained to illustrate the variation of the microstructure of cementitious materials after carbon capturing. The results show that, to a large extent, the semicircle diameter in the high frequency area gradually increased along with carbon curing and water curing. However, carbon curing showed a difference that the semicircle diameter in the high frequency appeared at the minimal value at 3 days, which was higher than that at 1 day and 7 days. This should be the result of the joint influence of water content and porosity in the cement matrix. It was also found that the mass increase rates of carbonation with water–cement ratios of 0.4, 0.5, and 0.6 were basically stable at 3.4%, 5.0%, and 5.5%, respectively. The electrochemical parameters ρ ct 2 of cement mortar corresponding to carbon curing were around three times that of water curing specimens, mainly due to the reduction of soluble materials and refinement of connecting pores in the microstructure of cementitious materials. A quadratic function correlation between the mass increase rate and ρ ct 2 in the carbonation process of cement mortar was built, which proved that EIS analysis could be applied to monitor the carbon capturing of cement-based materials, either for newly mixed concrete or for recycled concrete aggregates.

Keywords: carbon capturing; electrochemical impedance spectroscopy; cement-based materials; equivalent circuit model; recycled concrete aggregates (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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