THE EFFECTS OF REPLACING CEMENT IN CEMENT CONCRETE WITH VARYING AMOUNTS OF PHOSPHOGYPSUM WERE EXAMINED IN AN EXPERIMENTAL INVESTIGATION

Naturally available sand is most important component of concrete, currently it’s very much costly due to over population or increasing infrastructure projects or in large scale depletion of naturally available resources creating ecological issues. For neglecting this problem we require alternative or efficient resources in construction industry. Quarry Dust is obtained by the process of quarrying; it’s used as a filling materials and Metallic dust is a by-product of carbon steel which is obtained from industry. The demand of sand is increasing day by day in developing countries. So serious problem for thousands of workers labors and civil engineers has been arise due shortage of sand for construction. The construction industries one of the largest industries in the world, and sand is a crucial contributor in everything to do with construction materials. More than 50 billion tons of sand is used in construction globally. In this Thesis work sand is half replaced by Mild Steel Scrap or Quarry Dust. This Thesis is about the experimental study on Strength of Concrete of M20 Grade with half substitute of Sand by Mild steel Scrap and Quarry Dust. For the Analysis of Mechanical Properties of Concrete like Compressive Strengthening and Split Tensile Strengthening etc. different types of concrete mix prepared. In earlier stage sand has been differentially replaced by 5% of Mild Steel Scrap or Quarry Dust having 10%, 15%, 20%, 25%, 30% partial replacement. In second stage sand has been differentially replaced by Mild Steel Scrap proportion of 10%, 15%, 20%, 25%, 30% and Quarry Dust by 40%, 35%, 30%, 25% and 20% partial replacement. I had also done various trial of mix, control mix etc. Compressive Strength test was done on mould size cube 150 mm x150mm x 150mm for 7th or 28th days and Split Tensile Strength is also done by UTM machine. The entire concrete cube specimen was cured for 7th or 28th days in deep water tank on standard temperature of 27oC. This experiment results indicated considerable Increasing in the Strength of Concrete with addition of Mild Steel Scrap and Quarry Dust up to 40 percentage replacement of sand and after further increases the % of Mild Steel Scrap and Quarry Dust, a drop in strength of concrete was noted. This thesis study shows Compressive Strengthening and Split Tensile Strengthening of different Mixes of group I and group II.