Development of high-performance concrete using ultrafine flyash

Increasing urbanization and industrialization demands advanced infrastructure over the existing structure, especially in a developing country (like India) where the population is very large and keeps on increasing. To deal with this complex situation there is an essential need for structures that have higher strength along with sustainability in design. The current project deals with the development of high performance concrete using ultrafine flyash. The project aims to develop high strength concrete of M-60 grade with binary blending of cement with ultrafine flyash and ternary blending of cement with ultrafine flyash and silica fume to produce precast concrete of M-50 grade. Further, the desirable percentage of ultrafine flyash in the development of high-strength concrete of M-60 grade and desirable percentages of both ultrafine flyash and silica fume in precast concrete of M-50 grade was found out to achieve the desired target strength according to the Indian standard criteria. Workability and compressive strength tests were performed on all the mixes. Results reveal that 5% replacement of cement by ultrafine flyash is the most desirable amount which can satisfy the criteria according to various Indian standard codes. Further, other strengths and durability tests were performed on desired concrete. The results show that desired concrete satisfies all the criteria and used in the development of the metro structure.