Natural additive (nopal mucilage) on the electrochemical properties of concrete reinforcing steel

Abstract

In this investigation the effect of Nopal mucilage on the electrochemical properties of concrete was evaluated. Three concentrations of this additive were designed with a Nopal-water ratio of 1:1, 1:2 and 1:3. Compressive tests were performed after 28 days of curing. Specimens were evaluated for 270 days through various electrochemical techniques such as: Open Circuit Potential (OCP), Electrochemical Noise (EN) and Linear Polarization Resistance (LPR). Results indicate a decrease in compressive resistance in samples with Nopal mucilage at 28 days. The onset of steel corrosion was delayed and the corrosion rate was lower for samples with Nopal mucilage. The conservation and storage of this additive before being used in concrete can be a challenge to analyze.

Corrosion effect on reinforced concrete with the addition of graphite powder and its evaluation on physical-electrochemical properties

“…The configuration for measurement was three nominal identical steel rods, whereas the third electrode nominally identical to the two working electrodes acts as a reference electrode (Sánchez-Amaya et. al., 2009;Blanco et. al., 2019).…”

“…Called noise resistance (Rn), in the expression (2) it is calculated as the quotient between the standard deviations of the potential over current records (Sánchez et. al., 2005;Bertocci et. al., 1997).…”

“…During days 42 and 70 there is an increase in the Rp of samples M1 and M2, maybe indicating a decrease in the rate of metal corrosion. Such high R p values are an indication that the steel is passive (Blanco et. al., 2019).…”

Effect of natural additives on concrete mechanical properties

“…The addition of nopal mucilage improves the electrical resistivity, effective porosity, and chloride permeability for different contents of the extract substituting the water in the concrete blend (Aquilina et al, 2018;Blanco et al, 2019;Torres-Acosta & Díaz-Cruz, 2020). However, compressive strength needs more extended periods to be positive, and the average time is seven days until the compressive strength is equal to the blend with no extract and 28 days to reach at least 20% more.…”

Avaliação da influência da corrosão na estabilidade global de colunas em concreto armado

“…Several studies aim to reproduce the deterioration conditions in the laboratory through accelerated tests (Meira e Ferreira, 2019). In addition, other authors intend to investigate the impact of different additions on the corrosive potential of RC (Amorim Júnior et al, 2021;Santos et al, 2020;Blanco et al, 2019;Figueiredo et al, 2014). Such studies are necessary as it is estimated that up to 3.5% of a developed country's Gross Domestic Product (GDP) is spent on repairs from corrosion degradation (Mackechnie e Alexander, 2001).…”