Abstract
This research evaluates the behaviour of corrosion in reinforced concrete, buried in a soil type MH, the present study represents the conditions of exposure that can find the foundations of infrastructure such as bridges, buildings, pavements, when in contact with a soil that could contain aggressive agents like chlorides and sulfates. In such concrete specimens a steel bar AISI 1018 and Galvanized Steel was embedded as reinforcement, the mixed concrete was of ratio w/c=0.45 (F´c = 350 kg/cm2), according to ACI 211.1, using two type cements CPC 30R (Type I) and CPC 30R RS (Type V). The corrosion rate was evaluated by electrochemical techniques, corrosion potential Ecorr (ASTM C-876-15) and Linear Polarization Resistance. LPR (ASTM-G59). These specimens of study were buried in a soil type MH contaminated with 0, 1, 2 and 3% NaCl as aggressive agent by weight of soil, the exposure time was 260 days where, the results show that when the presence of NaCl in the soil was increased to 2 and 3% the levels of corrosion are from high to very high in all concretes, presenting a little better performance the concretes reinforced with galvanized steel and a small benefit could be identified or related to the properties of a denser and less impermeable matrix that presented the concrete mix made with cement CPC 30R RS (Type V).
Highlights
The problem of corrosion of steel reinforcement in concrete structures has been extensively studied since the 50’s
It is perfectly observed the difference between the two types of steel used as reinforcement, AISI 1018 carbon steel commonly used in most reinforced concrete structures worldwide, with respect to Galvanized Steel
Roventi et al (2014) reported that the specimen with galvanized steel embedded in Ordinary Portland Concrete shows initial values of corrosion potential around −650 mV, while the bar embedded in Pozzolanic Concrete gives values around 100 mV SCE more negative, denoting a higher level of activity mainly due to the difference in pH between the concrete types, this behavior of higher activity level is presented in the 0RSG and 0RG specimens, as shown in Figure 3, having Ecorr values for the galvanized steel embedded in concrete made with CPC 30R-RS) of −660 mV at the beginning of the monitoring, and −780 mV in concrete made with CPC 30R
Summary
The problem of corrosion of steel reinforcement in concrete structures has been extensively studied since the 50’s. Is a very important problem, because the service lifetime of a reinforced concrete structure can be reduced by corrosion of the embedded reinforcing steel. Such corrosion is due to aggressive agents which come from the ambient environment (Caré and Raharinaivo, 2007). The chloride ions are capable of causing localized corrosion of the reinforcing steel and to produce the premature and unexpected failure of the structure (Liang and Lan, 2005; Zuquan et al, 2007), being a determining factor the chlorides threshold, because the steel rebar inside reinforce concrete structures is susceptible to corrosion when permeation of chloride from deicing salts or seawater results in the chloride content at the surface of the steel exceeding a chloride threshold level (CTL) (Ann and Song, 2007; Babaee and Castel, 2018; Alonso et al, 2019)
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