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Phosphogypsum

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phosphoric acid by the action of sulphuric acid on the rock phosphate. It can be gainfully utilized in cement and building materials industries. It needs beneficiation before use because of the presence of deleterious constituents like P2O5 and fluoride. The disposal of phosphogypsum is a serious environmental problem. This problem along with scarcity of cement, and its increased cost can be solved to some extent by partial replacing the cement in concrete with phosphogypsum. Due to its pozzolonic properties it can be used for partial replacement of cement. The present paper deals with the experimental investigation on compressive strength, tensile strength, impact strength and durability characteristics of hardened concrete. The study aims to determine the …show more content…

Phosphogypsum is produced by various process such as dehydrate, hemihydrates and anhydrite processes. In India the majority of phosphogypsum is produced by the dehydrate process. Dehydrate process is lower maintenance cost and simplicity in operation as compared to the other processes. It is also produced from the hydrofluoric acid and boric acid industries.

The physical properties of the phosphogypsum as follows:

 Color : gray
 Particle size : 0.5 mm (No. 40 sieve) and 1.0 mm (No. 20 sieve) and majority of the particles (50-75%) are finer than 0.075 mm (No. 200 sieve).
 Specific gravity : 2.3 - 2.6
 Dry bulk density : 1470 -1670 kg/m3
 Moisture content : 25 -30 % Phosphogypsum was obtained from Rashtriya Chemical and Fertilizers (RCF), Chembur plant in Maharashtra state, India. It was tested according to IS: 12679-1989 and found to satisfy the requirements of IS: 12679-1989. The chemical composition of phosphogypsum is shown in the table

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