Abstract
Calcium aluminate cement (CAC) is a binder whose hydrated compounds change over time from cubic phases to hexagonal phases, producing an increase of porosity in reinforced concretes. Thereby, chloride ions, among other steel corrosion promoters, can enter the concrete more easily leading to an increase of the reinforcement corrosion process. When such a transformation of phases is completed, a characteristic value regarding both corrosion intensity (Icorr) and resistivity (related to the ohmic drop of the cementitious material) is reached, which depends mainly on the mix proportions of the material and the curing procedure. This paper presents the characteristic corrosion intensity values of steel embedded in mortars made of CAC after five years of exposure to either a 0.5 mol/l or 1.5 mol/l NaCl solution in order to be applied to estimate the service life of reinforced concrete made of calcium aluminate cement (CAC) which is used in real construction structures. Ohmic drop measurements are also presented to support the values obtained. The aim of this paper is to model the corrosion rate and resistivity of the steel reinforcement of calcium aluminate cement mortar with regard to environmental factors (temperature and chloride content) and mortar quality (water/cement ratio).
Highlights
Steel reinforcement corrosion is one of the major problems for a reinforced concrete structure exposed to a chloride environment. e passivation layer is removed locally by the chloride ions when the critical chloride threshold level is achieved
When such a transformation of phases is completed, a characteristic value regarding both corrosion intensity (Icorr) and resistivity is reached, which depends mainly on the mix proportions of the material and the curing procedure. is paper presents the characteristic corrosion intensity values of steel embedded in mortars made of CAC after five years of exposure to either a 0.5 mol/l or 1.5 mol/l NaCl solution in order to be applied to estimate the service life of reinforced concrete made of calcium aluminate cement (CAC) which is used in real construction structures
Ohmic drop measurements are presented to support the values obtained. e aim of this paper is to model the corrosion rate and resistivity of the steel reinforcement of calcium aluminate cement mortar with regard to environmental factors and mortar quality
Summary
Steel reinforcement corrosion is one of the major problems for a reinforced concrete structure exposed to a chloride environment. e passivation layer is removed locally by the chloride ions when the critical chloride threshold level is achieved. Steel reinforcement corrosion is one of the major problems for a reinforced concrete structure exposed to a chloride environment. Corrosion of steel-reinforced concrete made of calcium aluminate cement (CAC) has been reported in Europe [1, 2]. It is estimated that about 200,000 dwellings were built in Spain between 1950 and 1970 using calcium aluminate cement (CAC) concrete. It has been reported [3] that the lower the level of C3A in Portland cements, the lower the chloride ion binding capacity is. Erefore, calcium aluminate cement (CAC) might provide a high binding capacity due to the high Al2O3 content and reduce the corrosion rate [6]. The chloride binding capacity increases by the curing time [7]. e high efficiency of CAC regarding chloride binding is found in other ion immobilization [8]
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