Evaluation of the Influence of Heavy Metals in the Hydration Process of Mortars through Electric Measurements

Abstract:

The building materials are evaluated for their mechanical behavior, durability and most recently, about the risk of environmental contamination. Some heavy metals can be found in the waste added in cementitious matrices. The techniques of introducing the wastes in cementitious matrices allow the stabilization and solidification of the contaminants. However, this immobilization should be monitored and the effectiveness of this method is investigated by carrying out leaching tests, among other procedures. The objective of this study was to analyze the influence of heavy metals in the hydration process of cementitious matrices by way of tank tests carried out on mortar, previously contaminated with the heavy metals Zn²⁺, Cr³⁺ and Pb²⁺ at a concentrations of 20, 40, 80 and 160 ppm and to propose the use of electrical impedance spectroscopy (EIS) coupled to represents the leaching mechanisms. In the electric test was used an alternating current, varying the frequency of 200 kHz to 2 MHz. For assess the leaching behavior were performed the tank test (NEN 7375). The results showed that the heavy metals how the zinc and lead, can retard the setting time of the mortars and this was observed in the impedance spectrums throughout cure time of mortars. During the tank test the electrical impedance of the contaminated mortars were lower than the reference mortar and the output of portlandite caused an increase in the electrical impedance values. The electrical test is a not destructive technique, faster than the leaching tests and in the future, it can be performed to aid environmental testing.

• Periodical: Key Engineering Materials (Volume 600)
• Pages: 271-281
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.600.271
• Online since: March 2014
• Authors: Caroline Venâncio, Janaíde Cavalcante Rocha, Malik Cheriaf
• Keywords: Contamination, Electrical Impedance, Electrical Test, Heavy Metal, Mortar

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