Study of reinforcement corrosion in expanded clay concrete

Abstract

Expanded clay concrete differs from heavy-weight concrete not only by the composition and performance properties, but also by modes of chemical interactions between the components. So, not the primary problem of reinforcement corrosion in heavy-weight concrete under the normal conditions and the correct protective layer, becomes in the major problem in expanded clay concrete. The issue of reinforcement corrosion in expanded clay concrete is considered in this article. The studies on the effect of different compositions on the corrosiveness were conducted. Researchers have proposed various options for expanded clay concrete reinforcement protection from the environmental impact, including those through a variety of chemically active additives. According to the data obtained by experimenting, the diagrams of corroded area size dependence on various factors were presented.The results of the studies conducted are the recommended design and technological measures for the reinforcement protection against corrosion in various fine aggregate-based (natural sand, ash and dry hydroremoval) light-weight expanded clay concrete. Thus, the minimum concrete protective cover for main and distribution reinforcement of external walls must be at least 25 mm. It is necessary to inject additives -reinforcement corrosion inhibitors (sodium nitrite, sodium tetraborate) to the concrete composition. The consumption of cement, and hence, the cement paste content of concrete mixture must be not lower than 220 kg/m 3 , and under the application of the active dry fly ash removal À200 kg/m 3 .

The Research in the Use of Monolithic Concrete for the Mine Construction

“…Also in the course of the research it was found that the slag concrete resistance coefficient under the action of sulfate media was 0,92-1,4, and under the action of slightly acidic it was 1,2-1,26, under the rated -0.8. Consequently, the proposed concrete can be used under the mild acidic and sulphate aggression [7][8][9][10][11][12][13][14].…”

Experimental Evaluation of Workability Compressive Strength and Freeze-Thaw Durability of Concrete Containing Expanded Clay Aggregates

“…The open and closed pores of ECA, also, contribute to improving the properties of concrete against chloride penetration and reinforcement corrosion. Other authors, i.e., Chidighikaobi (2019), Dabbaghi et al, (2021), Ismail and Halim (2020), and Uglyanitsa et al, (2015), demonstrated that mixtures with ECA have higher thermal insulation and less affected than ordinary concrete after exposure to high temperatures or after cooling, which is favorable to improving the energy consumption of buildings. Several studies (Nahhab and Ketab, 2020;Nepomuceno, 2018;Ismail and Halim, 2020;Muñoz et al, 2018) found that the properties of mortars and concretes containing ECA depend on the size and shape of aggregate.…”

“…Research by Rashad (2018), Ahmad et al (2019) Bogas et al (2012) Nahhab and Ketab (2020), Bogas et al (2015), and Nepomuceno (2018) indicated that increasing the ECA content affects the sorption coefficient, porosity, and generates separation between aggregates and mortar compared to conventional concrete. The authors of Rashad (2018), Ismail and Halim (2020), Uglyanitsa et al (2015) reported that open and closed pores of ECA have an advantage in the formation of bonds between aggregates and cement paste. The open and closed pores of ECA, also, contribute to improving the properties of concrete against chloride penetration and reinforcement corrosion.…”