Enhancing Concrete Strength and Durability with Silica Fume and Fly Ash

The research explores the use of industrial waste materials like fly ash and silica fume in concrete to improve its strength and durability. By replacing a portion of cement with these materials, the resulting concrete mix becomes stronger, more durable, and eco-friendly. Fly ash and silica fume contribute to the formation of stronger compounds, enhancing the properties of concrete and making it a sustainable construction option.

• Concrete strength
• Durability
• Silica fume
• Fly ash
• Eco-friendly

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1. REPLACEMENT OF CEMENT BY SILICA FUMES AND FLY ASH BY: KEDAR M. PATURKAR 4THSEM B.E.(CIVIL) G. H. RAISONI COLLEGE OF ENGINEERING

2. Energy plays a crucial role in growth of developing countries. In of low availability of nonrecoverable energy sources coupled with requirements of large quantities of energy to materials like cement, steel etc, the importance of industrial waste cannot be underestimated. In India about 110 million tonnes of fly ash is produced every year by 68 major thermal power stations.

3. It has been no understood that waste material like flyash and silica fume, through their use as construction material can be converted into meaningful wealth. A proportionate mix of flyash and silicafume in concrete improves property of concrete that may not be achievable through portland cement alone. The resulting concrete mix becomes strong, durable and economical and also ecofriendly as it utilizes an ecological hazardous material.

4. A] FLYASH: It is waste product of mainly thermal power stations. The flyash in concrete converts the weaker C-H bonding to stronger C-S-H compounds by puzzolonic reactions. The heat generated during hydration initiates the puzzolonic reaction of fly ash.

5. B] SILICA FUME: Silica fume is byproduct of silicon or Ferro-Silica industry and 100 times finer than cement particle.(approx. diameter of 1 micrometre) It is commonly known as microsilica. The replacement level of silica fume is generally at about 10%. When silica fume is used in concrete mix , its introduction affects the physical arrangement of concrete near aggregate surface making the mix uniform and stronger.

6. 28 DAYS COMPRESSIVE STRENGHT TEST 28 days compressive test (mPa) 80 60 40 20 0 1 2 3 4 5 Flyash and silica fume % level Flyash and silica fume % level

7. 6 5 Split tensile strength (mPa) 4 3 2 1 0 1 2 3 4 5 Flyash and silica fume replacement % levels

8. 9 8 Flexural strength (mPa) 7 6 5 4 3 2 1 0 1 2 3 4 5 Flyash and silicafume replacement % levels

9. The optimum percentage of cement replacement by flyash is 30% and silica fume is 12% for achieving maximum cube compressive, cylinder compressive, split tensile and flexural strenths. With the above replacements, concrete with a strength of 70 mPa can be produced with water to cement ratio of 0.3 with appropriate plasticizers. The transition zone gets improved and densified with the use of ternary mix concrete containing microsilica and flyash. Substantial savings of 50-55% can be achieved through total replacement levels of silica fume and fly ash.

10. Concrete Technology by M. S. Shetty. Silica Fume User Manual by American Concrete Institute.

11. Thank you!!!

12. ANY QUESTIONS????