Effect of chemical admixtures on concrete’s electrical resistivity
| Autor: | Daniel Petzold Barbosa Lima, Ronaldo A. Medeiros-Junior, Diogo Henrique de Bem |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Cement
Materials science Metallurgy 0211 other engineering and technologies Superplasticizer 020101 civil engineering 02 engineering and technology Building and Construction 0201 civil engineering Corrosion Types of concrete Compressive strength Electrical resistivity and conductivity 021105 building & construction Air entrainment Mortar Civil and Structural Engineering |
| Zdroj: | International Journal of Building Pathology and Adaptation. 36:174-187 |
| ISSN: | 2398-4708 |
| DOI: | 10.1108/ijbpa-11-2017-0058 |
| Popis: | Purpose The purpose of this paper is to verify the influence of superplasticizer and air entrainment admixtures (AEs) in the electrical resistivity of concrete. Design/methodology/approach Ten different types of concrete have been studied. Three levels of superplasticizer and air AEs have been used (0.20, 0.35 and 0.50 per cent). Concrete samples were cast and the electrical resistivity was monitored at the ages of 28, 63 and 91 days. Compressive strength and density tests have also been executed. Findings The superplasticizer admixture presented an optimal level of 0.35 per cent that significantly increased the electrical resistivity. The air AEs at the same dosage caused a considerable decrease in the electrical resistivity. The concrete with air AEs showed highest resistivity/MPa ratio. Research limitations/implications The results should be carefully extrapolated for other materials and admixtures. Practical implications The usage of chemicals admixture in concrete is extremely common nowadays. However, only a few authors have studied the impact of such materials on the concrete’s electrical resistivity. Since many other researchers have already correlated electrical resistivity with other concrete’s properties, such as strength, setting time and corrosion probability, it is important to better understand how superplasticizers and air-entraining agents, for instance, impact the resistivity. Originality/value The vast majority of studies only tested the resistivity of cement paste or mortar and usually for short period of time (up to 28 days), which seems not to be adequate since the cement reaction continues after that period. This paper fills this gap and studied the impact of admixture on concrete and for a period of 91 days. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|