High Performance Concrete (HPC) is a composite mixture containing cementitious material and aggregate. The cementitious material is blended with Pozzolans such as silica fume particles and fly ash to enhance its binding and durability properties. This paper studies the effect of pozzolanic materials on the compressive strength and modulus of elasticity of HPC. An experimental program is conducted to evaluate the effect of silica fume, fly ash, and combination of the two used as cement supplemental materials on the modulus of elasticity. Results show that adding silica fume to HPC increases both the compressive strength and the modulus of elasticity at early ages. However, the increase subsides at later ages (< 28 days). New equation is proposed to accurately predict the modulus of elasticity of HPC. INTRODUCTION As higher emphasis is made on long-term durability, high-performance concrete (HPC) is becoming a standard for transportation structures in the United States of America (USA) [1-8]. HPC is created to reduce the porosity by adding pozzolanic materials (i.e., silica fume and fly ash) that with the presence of water react with the calcium hydroxide released by Portland cement hydration to form a cementitious compound. As a result, HPC becomes denser with lower capillary pores and prevent chloride ion penetration reducing the corrosion potential of the steel reinforcement. The addition of pozzolanic materials does not only affect the HPC durability but also the mechanical properties, namely the compressive strength and modulus of elasticity. Both the compressive strength and modulus of elasticity are very important properties for structural engineers to design and evaluate the structure, especially for deflection and creep calculations [9, 10]. Thus, the effect of pozzolanic materials on modulus of elasticity needs to be investigated. The objective of this paper is to evaluate the effect of pozzolanic materials, namely silica fume particles and fly ash, on the modulus of elasticity of HPC.

This content is only available via PDF.
You can access this article if you purchase or spend a download.