Effect of nano-silica and aggregate type on properties of ultra high performance concrete.

The aim of this investigation is to develop ultra high performance concrete (UHPC) for multipurpose – higher mechanical and ionizing radiation protection. The effect of nano-silica replacement (2 or 5%) on the properties of UHPC was compared with the referent concrete by testing compressive and flexural strength. As nano-silica influences cement hydration and modifies the pore structure, qualita- tive and quantitative analysis of pores was done using a device RapidAir 457. The second objective of this paper is to evaluate the influence of differ- ent aggregates on concrete properties. Two types of aggregate were used: quartz and barite. One of the most important characteristics of the concrete for protection against gamma and X radiation is its Total Attenuation Coefficient (μ/ρ)tot.

Author: K. Jankovic, S.J. Stankovic, M. Stojanovic, D. Bojovic, L. Antic

Section: Concrete

Keywords: nano-silica, UHPC, barite, radiation protection