Potential utilization of micro silica as a limited substitution with addition of glass and polypropylene fiber for M40 concrete

Abstract

Nowadays there is an increase in environmental knowledge and its effects on the environment, the disposal of waste products from industries are being big deal to manage. Such waste materials cannot be dumped on any lands, due to this reason it is difficult to manage waste materials. After so many investigations finally conclude that waste material can be utilized in the construction as additives, such materials can reduce the cost of construction and gives more strength compared to conventional concrete. These products can be utilized to partial replacement of cement. In this investigation, we are using Silica fume/ Micro silica as a partial replacement of cement. From this combination, we can improve the strength, workability and resist cracks in concrete. To reduce water content PAR PLAST SPL super plasticizer is used. The present investigation is to determine the strength behavior of Silica fume/Micro silica and fibres in Rigid pavement. The concrete mix design is as per IRC 44 2009, and it is proportioned to set target mean strength as 40 Mpa. The water-cement ratio as per mix design is 0.38. Specimens was casted and cured for various percentages that are 0%, 2.5%, 5%, 7.5% and 10%. With this constant percentage of fibres was added that is 1% Polypropylene fibre and 0.5% Glass fibre. This specimen tested for 3, 7, 28 days for cubes and 7, 28 days for beams and cylinders. From this investigation, Cement can be replaced with Micro silica to improve strength properties like bending and tensile strength. The Silica fume/ micro silica found at 7.5% optimum dosage, up to this percentage cement can be replaced.