An Experimental Study on The Properties of A Self Compacting Concrete Using Phosphogypsum

Abstract

Concrete permeability may be the most relevant property affecting its durability, especially under exposure to aggressive environment, as permeability is an aspect of concrete performance that must be specified, designed for monitoring in the production of concrete. Current research studies dealing with normal to moderate concrete strengths have questioned the validity of AASHTO T277, has sole indicator of concrete permeability it has been suggested that for specific concrete mixes AASHTO T277 should not be solely without developing initial correlation data with AASHTO T259 resistance of concrete to chloride penetration. The main objective of this study is been to evaluate the permeability of concrete with phosphogypsum as admixture by using the “Rapid chloride ion permeability test (RCPT)”. Replacement of cement by phosphogypsum as 0%, 10%, 20% and 30% for water / powder ratio 0.50 of M20 grade concrete for every mix 3 cubes of size 150mmX150mmX150mm and 6 cylinders of size 95mm diameter and 50mm height were casted. Cubes were tested at 28 days after casting and the statistical data presented. 3 cylinders were tested at 28 days after casting and remaining 3 cylinders were tested at 90 days after casting. Based on the amount of charge passed in coulombs, Chloride ion permeability of the concrete may be defined as high, moderate, low and very low. The statistical data of chloride ion permeability at 28 days and 90 days is presented.