Abstract
This study aims to investigate the effect of lime addition in cement mortar on corrosion resistance of carbon and galvanized steel reinforcements. Mixed mortars were studied containing three contents of lime (6.7, 13.3, and 26.3 wt.%). The water retention, incorporated air, and compression strength of reinforced mortars were determined. Immersion tests were performed using the reinforced mortars consisting of 12 cycles of immersion in a solution of 3.5% (wt./v) sodium chloride and drying in a stove at 60oC. Electrochemical impedance spectroscopy was used to monitoring reinforcement corrosion after cyclic tests. These measurements were repeated after 36 months of the cyclic immersion testing. After the cyclic immersion tests in a saline solution, the polarization resistance of carbon and galvanized steel reinforcement increased as the lime content in mortar increased, demonstrating the protective effect of lime. After 36 months, the polarization resistance of steels in mixed mortars with the highest lime content was the lowest. For the carbon and galvanized steel in cement and mixed mortars, the polarization resistance increased after 36 months of the cyclic test. Keywords: Lime. Mortar. Reinforcement corrosion. Electrochemical impedance spectroscopy.
Highlights
Studies focusing on materials used in Cultural Heritage conservation projects are increasingly relevant [1-3]
This study aims to investigate the effect of lime addition in cement mortar on corrosion resistance of carbon and galvanized steel reinforcements
There is an increase in corrosion potential of carbon steel and galvanized steel with the lime addition in mortar (Tables 5 and 6)
Summary
Studies focusing on materials used in Cultural Heritage conservation projects are increasingly relevant [1-3]. Heritage buildings have been built with mud/clay bricks and lime-based mortars since quite early historical times, as confirmed by traces of ancient constructions in Palestine and Turkey dating back to 12,000 b. Aerial lime-based mortars are recommended by many experts to restore the ancient buildings due to their compatibility with ancient building materials [4]. Garcia-Cuadrado et al [7] studied the fracture behaviour of lime-cement masonry mortars prepared with various fractions of lime and cement. One possibility that has arisen with the use of mixed mortar is related to the effect of lime addition on the corrosion resistance of the reinforcement. The reinforcement corrosion depends on the concrete-reinforcement interfacial condition which depends on the mortar used [8]
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