Ultimate Load of Different Types of Reinforced Self-Compacting Concrete Columns Attacked by Sulphate

In this study, the effects of the partial immersion of sulphate attack on the ultimate load capacity of reinforced self-compacting concrete (SCC) columns and the sulphate attack resistance improvement using silica fume, steel fibres, and the combination of silica fume and steel fibres were assessed. Twelve short circular self-compacting reinforced concrete columns (۰.۱۵۰ m in diameter and ۰.۷ m long) were cast and divided into groups according to (۱) the three acid-attack groups. The first group was tested without an acid attack (control). The second group was tested after ۱ month of exposure to ۲% acid. The final group was tested after ۱ month of exposure to ۴% acid and was then (۲) subdivided according to the type of casted concrete. The first group was cast with SCC. The second group was cast with SCC and silica fume (۰.۱% of the cement weight). The third group was cast with SCC and ۱% volume fraction steel fibres. The fourth group was cast with SCC silica fume and ۱% volume fraction steel fibre. All columns were tested by axial loading. The ultimate load was increased by ۴۲% with silica fume, ۱۹۰% with steel fibres, and ۲۳۸% with silica fume and steel fibres. Exposure to ۲% and ۴% acid reduced the ultimate loads of the columns casted with SCC by ۲۳% and ۴۷%, the columns casted with SCC and silica fume by ۳۴% and ۳۷%, the columns casted with SCC and steel fibres by ۶۹% and ۷۸%, and the columns casted with SCC, silica fume, and steel fibres by ۷۲% and ۷۹%, respectively. Based on the results, using silica fumes improved sulphate resistance, and using steel fibres enhanced sulphate resistance at an acceptable ratio. Furthermore, the mix with silica fume and steel fibres improved sulphate resistance at a good ratio. We encountered several problems in this study. The partial immersion of sulphate affected the strain in both concrete and steel. Future studies using different immersion ratios are recommended. Doi: ۱۰.۲۸۹۹۱/CEJ-۲۰۲۲-۰۸-۱۰-۰۴ Full Text: PDF

کلیدواژه ها:

Reinforced Concrete ، Sulphate Attack ، Partially Immersing in Sulphate ، Self-Compacting Concrete ، Steel Fibre ، Silica Fume.