Development of Ultra High Performance Concrete for Resistance under High Strain Rate Impact

Abstract

Ultra-high strength concrete (UHPC) is a modern composite material with extremely good mechanical characteristics. Component materials and curing regimes significantly affect the properties of UHPC. For this reason, the influence of supplementary cementitious material (metakaolin) and curing regimes (accelarated curing) on the properties of UHPC has been analyzed. With advances in concrete technology, ultra high performance concrete (UHPC) has become a new focus for researchers and the concrete industry. UHPC is characterized by high compressive strength and excellent durability properties resulting in lighter structures and longer life. Unlike conventional concrete, On the other side optimization of UHPC mix is also necessary to get the desired result. The optimized particle-packing allowed an increase in the concrete compressive strength leading to what was called Ultra-High-Strength Concrete (UHSC), and also an increase in the durability performance of concrete. Particle packing has been recognized to influence mechanical and durability properties of cementitious materials, which are generally favored by optimum packing density. An Ultra-High-Performance Concrete with an optimized particle packing by using a special selection of fine and ultrafine particles, low porosity and high durability. The use of a minimum content of fibers to guarantee a minimum degree of matrix ductility. Particle packing density is always playing an important role in the development of Ultra high strength concrete. In this study Puntke test was adopted to get the highest particle packing density of the cement and mineral admixture. Packing density test (water demand test) was performed on three binary mixture they were C+MK, C+SF, C+UFS. Among the three binary mixtures C+MK showed the highest packing density. C+MK further used to develop mixes. Optimization of mix designs was done by increasing or decreasing the percentage value of used material and further compressive strength test was performed on these trial mixes. Trial mix 13 showed the maximum compressive strength, because of more optimized mix design use in it. Influence of inert admixture and inert fillers were also investigated. For the simulation JHC model was adopted to analyzed the projectile impact.