Effect of nano alumina on some properties of sustainable reactive powder concrete

Reactive powder concrete (RPC) is an ultra-high-performance concrete.It consists of very fine powder including cement, sand, silica fume, quartz powder, steel fiber, superplasticizer, and very low water to cementitious ratio.Reducing the high cement content in RPC by replacing it with nano-Al 2 O 3 to produce environmentally friendly RPC was the objective of this study.In this research, 10% of the weight of fine aggregate was replaced with quartz sand.After that, 0.5%, 1%, and 1.5% by weight of cement was replaced with nano-Al 2 O 3. compressive strength, flexural strength, and splitting tensile strength tests were performed.The findings exhibited the optimal percentage of nano-Al 2 O 3 was 1% where the compressive, flexural, and splitting tensile strengths at 28 days increased by 10.57%, 20.89% and 15.68%, respectively, in comparison to the reference mixture.