Effect of Nano Calcium Carbonate on Some Properties of Reactive Powder Concrete

Abstract

Concrete is the most commonly used construction material, and its use is expected to rise as the world’s population grows, the economy develops, and aging infrastructure needs to be repaired or replaced. Unfortunately, one of its main constituents, cement, is responsible for approximately 5–10% of global carbon dioxide emissions. As a result, the industry as a whole and the specific material are in desperate need of re-evaluation. In this research, the effects of Nano calcium carbonate (NC) on some properties of reactive powder concrete (RPC) was studied. Nano calcium carbonate (NC) was added at rates(0.75, 1, and 1.5)%. As a partial replacement of cement weight. Reactive powder concrete (RPC) was developed from cement, nano CaCO3, recycled fly ash, silica fume, fine sand, steel fibers, superplasticizer, and water. Compressive strength tests, tensile strength tests, flexural strength were conducted at 7 and 28 days. Water absorption was specified at the age of 28 days. The results showed the addition of NC to the RPC improved the mechanical properties compared with the mixture without NC. also, the incorporating of nano-CaCO3 in RPC will contribute in produced RPC more environmentally friendly by reducing its cement factor, While achieving good engineering properties.