Utilization of Phosphogypsum as Partial Replacement of Fine Aggregates & Cement in Concrete Pavements

Ishfaq Ul Abass
M.Tech Student Department of Civil Engineering Vivekananda Global University Jaipur, Rajasthan, India , IN

Prof. (Dr.) M. Raisinghani
M.Tech Student Department of Civil Engineering Vivekananda Global University Jaipur, Rajasthan, India , IN

Ms.Payal Bakshi
M.Tech Student Department of Civil Engineering Vivekananda Global University Jaipur, Rajasthan, India , IN

Keywords: Phosphogypsum (PG), utilization, replacement, compressive strength, flexural strength, natural sand (NS)

Abstract

By the speedy growth of human requirements in many sectors, a considerable decrease in the availability and feasibility of the natural resources was forever faced. Neither the less, the high amount production is forever coupled with considerable amount of waste resources, which may unfavourably impacts the nearby environment. Efforts on by-passing such circumstances were newly intensified in several countries and global establishments looking for recent rules and legislations to reduce and reuse the generated waste. One of the foremost waste generating is the fertilizer and chemical manufacturing industries, with high amount of phosphogypsum (PG) as a byproduct waste is generated worldwide. PG generated from chemical and fertilizer plants is being dumped and stacked in open yards, empty pits, pasturelands and landfill leading to extensive dispersal of environmental pollution. PG is a solid by-product material resulting from the manufacture of phosphoric acid, a major constituent of many fertilizers. Depending upon the source of rock approximately 4.5-5.0 tons of PG are generated per ton of phosphoric acid (H3PO4) produced. PG primarily mainly consists of calcium sulphate (CaSO4) up to 93%; rest is a combination of impurities such as phosphate, soluble salts, fluoride, sand and organic compounds. The aim of my study is based on proper utilization of PG as a partial replacement of (a) fine aggregates in cc-pavements (b) cement in cc-pavements. The study includes the material characterization of PG sieve analysis, specific gravity, moisture content, workability, compressive strength, flexural strength, unit weight, normal consistency, and initial and final setting time.

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