International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 10 Issue: 04 | Apr 2023
p-ISSN: 2395-0072
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A Study of Micro-Silica as a Partial Replacement of Cement in Concrete Assistant Prof Vikas P Jadhao1, Siddhi Malatkar2, Sakshi Musale3, Sonal More4, Pravin Khole5, Siddhesh Bagul6. 1Assistant Professor, Civil Engineering Department,
2,3,4,5,6 Students, B-tech, Civil Engineering, Government College of Engineering Jalgaon-425001[MS]India
---------------------------------------------------------------------***--------------------------------------------------------------------According to that micro silica is cheaper than the cement Abstract - Concrete is widely used material in the field of
hence it is a very good replacement. And also by doing the replacement of cement with micro silica the strength of concrete is also increased.
construction and also replacement or by doing addition of other material may change the properties of concrete. Now a days use of concrete is increased for high rise building and due to that there is increase in demand of concrete with higher compressive strength, also one of expensive ingredient in concrete is cement and to make the concrete mix economical it should be replaced with any other cheap material hence in this experiment we are going to do partial replacement of cement with the cheap material like condensed silica fume to increase the compressive strength and workability of concrete. In this experiment we will take various proportion, 5%,10%,15% of adding micro silica by the mass of cement in concrete in mix design of M25, M30 and M35 grade of concrete as per IS code.
2.LITERATURE REVIEW Ghutke and Bhandari (2014)
Key Words: Condensed silica fume/ micro silica/ silica fume, Compressive strength, Concrete mix.
The influence of micro silica on concrete was examined in this study. The result showed that micro silica is a good for partial replacement of cement. The strength was increased when cement was replaced with micro silica. Concrete reduces its workability as percentage of micro silica is increased. The optimum compressive strength can be obtained in 10% replacement of micro silica. As strength of 15% replacement of cement by micro silica is more than normal concrete. The optimum cement replacement percentage by micro silica varies from 10% to 15 %.
1.INTRODUCTION
Hanumesh, Varun and Harish (2015)
The concrete is mostly used material for construction any structure for example dams, roads pavements, tanks etc. Concrete mixture is consist of cement, sand, coarse aggregate and water. The process of selecting suitable ingredients of concrete and determining their relative amount with objective of producing a concrete of required strength durability and workability as economically as possible is termed as concrete mix design. In the concrete mix design cement is the costly material so it should be replaced by any other cheap material.
In this study it is observed the mechanical properties of concrete when partial replacement of cement is done with micro silica. The main aim of this work is to study mechanical properties of M20 grade concrete when cement is replaced with silica fume at different percentages (5,10,15 and 20). The results showed that strength of concrete is increased when 10% replacement of cement is done with micro silica. Above 10% replacement of cement with silica fume it is observed that there is decrease in compressive strength. Hence, optimum percentage of replacement of cement by silica fume is 10% for M20 grade of concrete.
While replacing the cement the care should be taken that the strength of concrete is not reduced. The micro silica also known as silica fume or condensed silica fume is the good replacement of cement in the concrete mix design. The silica fume is a by product of silicon and ferrosilicon alloy production. It is an ultra fine powder.
3.METHODOLOGY The main objective of mix design is to decide the properties of material which we are going to use in concrete so that concrete will be produced of required properties. Another objective of mix design is to achieve the desired workability of fresh concrete and also to obtain minimum strength at the hardened stage. Mix design is also used to produced concrete economically so that wastage will be avoided.
Hence when it is used in concrete to fill the spaces between the cement particles and between the cement paste matrix and aggregate particles and it act as a filler and cementitious material. Hence by using silica fume is concrete the voids are also reduced. For replacement of cement generally cheaper materials are selected.
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