Experimental Study on Partially Replacement of Cement and Fine Aggregate with Phosphogypsum and Quarry Dust in Concrete Mix

The Quarry rock dust can be an economic alternative to the river sand. Quarry Rock Dust can be defined as residue, tailing or other non-voluble waste material after the extraction and processing of rocks to form fine particles less than 4.75mm.Usually,Quarry Rock Dust is used in large scale in the highways as a surface finishing material and also used for manufacturing of hollow blocks and light weight concrete prefabricated Elements.. Phosphogypsum is a by-product in the wet process for Manufacture of phosphoric acid by the action of sulphuric acid on the rock phosphate. It is produced by various process such as dehydrate, hemihydrates or anhydrate processes. In India the majority of phosphogypsum is produced by the dehydrate process due to its simplicity in operation and lower maintenance as compared to other processes. The annual production of phosphogypsum from one dozen phosphoric acid and fertilizers plants is of the order of approximately five million tons. To investigate the best mix proportion of the partial replacement of phosphogypsum for cement and quarry dust for fine aggregate in concrete by the value of strength per weight ratio of sample specimen. To investigate the feasibility of the partial replacement of above material in concrete by Determining its compressive strength and split tensile strength. Based on the test results, to suggest most approximate level of adding phosphogypsum. To investigate the utilization of Industrial wastes as a replacement for cement and fine aggregate in concrete and influence of this on the Strength of concretes made with different cement replacement levels with admixtures. Cement motor ratios