Micro Silica as Partial Replacement of Cement in Concrete by IRJET Journal

International Research Journal of Engineering and Technology (IRJET)

e-ISSN: 2395-0056

Volume: 10 Issue: 05 | May 2023

p-ISSN: 2395-0072

www.irjet.net

Micro Silica as Partial Replacement of Cement in Concrete Lins Paul Kuriakose1, Ann Mariya Baby2, Arif Ali3, Muhammed P A4 , Sandhra Sibi5 1Assistant professor,Department of Civil Engineering Viswajyothi College Of Engineering and Technology,

Vazhakulam, Kerala, India

2,3,4,5 UG scholars Department of Civil Engineering, Viswajyothi College Of Engineering and

Technology,Vazhakulam, Kerala, India ---------------------------------------------------------------------***---------------------------------------------------------------------

Abstract –Concrete that has been treated with silica

1.2 Objectives

fumes is flowable in nature but still cohesive, producing high early and later age strength as well as resistance to hostile environments. This investigation explores the characteristics of silica fume and how they affect the characteristics of recently-poured concrete. The strength properties of concrete have been investigated through the partial replacement of cement with silica fume. Researchers looked at the strength characteristics of concrete without any partial replacement. Then, using cubes, cylinders, and beams cast in silica fume and tested using a compression testing machine (CTM), strength parameters were investigated. For cube, cylinder, and beam construction, silica fume was utilized to replace 5% to 15% of the cement by weight at increments of 2.5%. The results demonstrated that the compressive strength of the cube and split tensile strength of the cylinder were significantly affected by partially replacing cement with silica fume. The ideal value of compressive strength will be attained at 12.5% replacement. The strength of concrete increases quickly as the silica fume level increases.

b) To determine the optimum percentage of micro silica in conventional concrete. c)

The methodology adopted comprised of both preliminary and experimental investigations: a) Literature review : The journals related to the topic are referred and collected. It helps to understand various aspects of the project and lead the progress of the project b) Material collection : Cement, fine aggregate, coarse aggregate of required quantity is collected from the market. Micro silica is collected from ferro-alloy industry

1.INTRODUCTION

c) Preliminary test : Specific gravity, setting time and consistency of cement are determined. Gradation bulk density and specific gravity of sand and micro silica are determined. Gradation and specific gravity of coarse aggregate is also found.

1.1 General Concrete is the most important engineering material, and adding other materials can change the properties of concrete. Micro Silica is a pozzolanic substance that has been used successfully all over the world since 1900 and is environmentally stable. It is an industrial by-product of the ferro-alloy and high purity quartz industries. A mineral additive known as micro silica is made up of small, solid silicon dioxide (SiO2) spheres. Nearly all of micro silica particles have a diameter of less than 1 micron (0.00004 inch), which is 50 to 100 times smaller than typical cement or fly ash particles. Fine amorphous silica is known as micro silica or silica fume. The most crucial component of an engineering design is concrete. Pozzolanic portions are added to concrete to boost its mechanical strength and durability because the silica in these materials blends with the calcium hydroxide generated during cement hydration to yield more calcium silicate hydrate (C-S-H).

Impact Factor value:8.226

To ascertain the flexural, split tensile, and compressive strengths of concrete using several substitutions of micro silica.

2.METHODOLOGY

Key Words: Silica fume, compressive strength, splitting tensile strength, flexural strength.

To evaluate the workability of concrete that has been 0%, 10%, 12.5%, and 15% partially replaced with micro silica.

d) Casting of test specimen : Workability is tested using slump test. Mix proportioning is carried out for M 30 concrete. Components are mixed in required proportions and specimens are casted as cubes, cylinders and beam. e) Curing : The specimens are cured in a curing tank for 28 days. f)

Specimen testing : The cube specimens are tested to determine compressive strength, the cylinder specimens for split tensile strength and beams for flexural strength.

g) Comparison and analysis of result : The value of different strength properties of concrete

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