Investigation on Fly Ash based High Performance Concrete with Alccofine/Silica Fume-Ternary System Dhanalakshmi K.*, Ganesan K.** *Department of Civil Engineering, University College of Engineering, Nagercoil, Tamilnadu, India **Department of Civil Engineering, Sudharsan College of Engineering, Pudhukkottai, Tamilnadu, India Online published on 23 March, 2017. Abstract This study assesses the properties of High Performance Concrete (HPC), which include supplementary cementitious materials such as Fly ash (FA), Alccofine (AF) and Silica Fume (SF). Many efforts were made to improve the hardened properties and durability characteristics of concrete using the cement replacement materials beside with chemical and mineral admixtures. To achieve significantly more sustainable structures, durability improvement should be considered. In this study, the performance of concrete mixes was investigated regarding workability, compressive strength, splitting tensile strength and alkalinity. In addition to that, the finding extended to evaluate the optimum dosage of alccofine and silica fume in fly ash based HPC. The silica fume incorporation with fly ash has increased the compressive strength of concrete and reach a maximum of 76.24 MPa at the age of 28 days (12% FA + 8% SF) and 79.13 MPa at the age of 56 days (12% FA + 10% SF). The highest strength obtained in the ternary mix, when the silica fume replacement was in between 8 to 10%. Results showed that the concrete incorporating FA+ SF combination gives better strength than the FA + AF (8%) mix (73.50 MPa and 74.86 MPa at 28 days and 56 days respectively). Both of the ternary systems enhanced the performance regarding splitting tensile strength and the durability by conducting alkalinity test on concretes. However, considering the cost aspect AF can be used in place SF as a cement replacement material. Top Keywords Fly ash (FA), Alccofine (AF), Silica Fume (SF), Compressive strength, durability, alkalinity. Top |