Concrete made with Portland cement ,water admixtures and aggregates comprises in quantity the largest of all man made material.
Historically whenever new compounds were produced ,or waste materials accumulated in industries ,they were incorporated as one of ingredients of concrete.
Typical examples are fly ash phosphogypsum,blast furnace slag, saw mil waste, rice husk, cotton etc.The wide spread need for conserving resources & environment will be reflected major emphasis on the use of wastes & by products.
Recycling of concrete materials also offers some promise. Attempts are already being made to use municipal refuse & waste oil as partial substitutes for the fuel in the production of cement clinker
Please find the following attachments"Waste & recycled material in concrete technology seminar report/pdf/ppt download"here.............