MODIFICATION OF PLAIN CONCRETE BY REPLACEMENT OF FINE AGGREGATE WITH FOUNDRY SAND

Abstract

In the last 20 years the growth of construction industry is increasing very fast due to increase in population. The natural sand required for construction work is decreasing as natural sand available is limited in quantity. The decreasing of natural sand is the global problem. As urbanisation is increasing the natural sand is also empting in the same rate. The new deposits are found underground and access to these deposits are more difficult. The environmental concerns are opposing the vast and uncontrolled excavation of natural sand from river beds, as it act as filter for ground water. Above fact diverts construction industry to look for alternative material which is waste from other industries. In most of the countries natural sand is replaced by crushed sand, foundry sand and various by products. Due to use of above waste material, cost of construction is also reduced and this also solve problem of disposal of this waste material. Production of waste foundry sand causes environmental problems due to improper disposal of foundry sand. The study is carried out to use maximum foundry sand with retaining the properties of the concrete, and to produce a low-cost and eco-friendly concrete. In the present work, experimental investigations were performed to calculate comparative study of properties of fresh concrete using replacement of fine aggregate with foundry sand. Foundry sand is replaced by 10%, 20%, 22%, 24%, 26%, 28%, 30% & 40% by weight of fine aggregates.M20 grade of concrete is designed & test are taken for compressive strength, Flexural strength & Split tensile strength for 7 & 28 days curing period.