Comparison between the effect of silica fume and fly ash in high strength concrete using concrete mix design

  Tapash Mazumdar

Concrete is the most important engineering material with cement as the basic ingredient. Concrete consumption is second only to water in terms of total volume consumed annually. With increase in trend towards the wider use of concrete for pre stressed concrete and high rise buildings there is a growing demand of concrete with higher compressive strength, thus driving up the concrete demand in the construction sector. The present per capita cement consumption is about 190 kg/capita and it will increase up to about 465 kg/capita to 810 kg/capita. Increased production of cement will have a strong impact on the overall energy utilization of the cement industry. More energy input will be required to meet the demand in various processes, which will result in increased fuel consumption leading to higher emissions of CO₂ and other green house gases. Enormous efforts are being made in the cement industries to bring down the carbon dioxide emission during cement production by using cement substitution. Clinker substitution by supplementary cementitious materials like silica fume and fly ash is being used as mineral admixtures to the cement. Both silica fume and fly ash are regarded as waste product produced in the industries. Silica fume is defined as very fine non crystalline silica produced in electric furnaces as a by-product in the production of elemental silicon or alloys containing silicon. Fly ash is defined as the by-product recovered from the gases of burning coal during the production of electricity and also from boilers. The use of these by-products offer environmental advantages by diverting the material from the waste stream, reducing the energy investment in virgin materials, thus reduces the cost of construction and also improving the performance and quality of concrete. The comparative use of silica fume and fly ash as cement replacement and its effect in the production of high strength concrete has been studied in this project. We have used 5%, 10% and 15% by weight of cement as replacement by silica fume and fly ash in concrete.

Keywords- Cement, High Strength Concrete, Silica fume, Fly ash, Concrete Mix Design, Concrete properties

Unique Identification Number - IJEDR2203008
Page Number(s) - 47-65
Pubished in - Volume 10 | Issue 3 | July 2022
DOI (Digital Object Identifier) -    http://doi.one/10.1729/Journal.31043
Publisher - IJEDR (ISSN - 2321-9939)

  Tapash Mazumdar,   "Comparison between the effect of silica fume and fly ash in high strength concrete using concrete mix design", International Journal of Engineering Development and Research (IJEDR), ISSN:2321-9939, Volume.10, Issue 3, pp.47-65, July 2022, Available at :http://www.ijedr.org/papers/IJEDR2203008.pdf