Performance of sustainable high strength concrete with basic oxygen steel-making (BOS) slag and nano-silica

• Published in: Journal of Building Engineering 2019-09, Vol.25, p.100791, Article 100791
• Main Authors: Zareei, Seyed Alireza, Ameri, Farshad, Bahrami, Nasrollah, Shoaei, Parham, Moosaei, Hamid Reza, Salemi, Niloofar
• Format: Article
• Language: English
• Subjects: Basic oxygen steel-making (BOS) slag; Durability; High strength concrete (HSC); Mechanical properties; Nano-silica
• ISSN: 2352-7102; 2352-7102
• DOI: 10.1016/j.jobe.2019.100791

This study presents the results of an experimental evaluation of the performance of high strength concrete (HSC) with basic oxygen steel-making (BOS) slag and nano-silica respectively used as a partial replacement of sand and cement. The properties of fresh and hardened concrete specimens containing 25%, 50%, 75%, and 100% BOS as partial replacement of sand and 2% of cement replaced with nano-silica were evaluated. According to the results, concrete samples containing nano-silica with higher BOS percentages, demonstrated improvements in strength and durability properties, while workability was reduced. For example, at 50% BOS content, about 18% increase in compressive strength and 50% reduction in water absorption was observed, while slump was reduced by 40%. •The performance of high strength concrete with BOS and nano-silica was evaluated.•Mechanical and durability properties of concrete with BOS and nano-silica were improved.•BOS resulted in a significant reduction in workability.•Nano-silica reduced the crack width, while BOS had an adverse effect on crack width.