Investigating the sustainability of concrete by replacing cement with fly-ash and brick kiln dust

In this high time of infrastructure development concrete is considered to be the cornerstone of construction industry. Production of both cement and concrete contributes to global warming as their production emits carbon-dioxide into environment. Therefore, for many decades waste management and resource development were been carried out, taking repercussions of construction industry on Global Climate Change in-to consideration. Replacement of cement with industrial waste in concrete had become an effective technique of waste management. With the adjoining effect of mechanical strength & workability of concrete, the waste management related issue was also solved with the use such industrial waste. With the use of industrial waste we can enhance the mechanical properties of concrete. In the present state of research two such unintended but inevitable products (by-products) are cogitated which are Brick-Dust-Powder and Fly-ash. Firstly, replacement of cement was done using both the industrial by-products in various proportions of 2.5%, 5%, 7.5%, 10%, 12.5%, 15% and 20% separately. Taking into contemplation the mechanical strength of concrete, both brick dust powder (BKD) and fly-ash (FA) is then mixed together. Both BKD and FA were mixed in various proportion of 2.5%(BKD)+2.5%(FA), 5%(BKD)+5%(FA), 7.5%(BKD)+7.5%(FA), 10%(BKD)+10%(FA), 12.50%(BKD)+12.50%(FA). Analysis of compressive & split tensile strength was done on the sample cured for 7days, 14days and 28days. Workability of various samples of fresh concrete was investigated immediately after mixing. The present work signifies that both BKD and FA when used separately or in combination increase the mechanical strength of concrete.