| Pub. Date | : April, 2021 |
|---|---|
| Product Name | : The IUP Journal of Structural Engineering |
| Product Type | : Article |
| Product Code | : IJSE40421 |
| Author Name | : M Vijaya Sekhar Reddy and K Chandrasekhar Reddy |
| Availability | : YES |
| Subject/Domain | : Science and Technology |
| Download Format | : PDF Format |
| No. of Pages | : 8 |
The carbon dioxide produced by cement industries causes environmental pollution and global warming. In 1000 Kg of cement manufacturing processes, approximately 900 Kg of CO2 is emitted. In order to reduce the impact of cement production on atmosphere, waste bi-products are used as admixture. In India, every year 75 million tons of fly ash, which are rich in silica, are disposed to landfill as waste. Also, Egg Shell Powders (ESP), which are rich in calcium, are thrown away as waste. In the paper, these two wastes are used as a partial replacement of cement, and various properties like workability, compressive strength, split tensile strength and flexural strength are studied. ESP was varied up to 15.0% (0%, 2.5%, 5%, 7.5%, 10%, 12.5% and 15%) and fly ash was added to cement from 0% to 30% (0%, 5%, 10%, 15%, 20%, 25% and 30%). The results further showed that addition of fly ash along with ESP is beneficial for improved performance of concretes.
The development of a nation depends on not only technology but also infrastructure.
Without concrete, infrastructure is not possible. The major element of concrete is
cement. Since cement price is volatile and demand is so high, an alternate material
can be used for replacement of cement. Several replacement experiments have been
done for coarse and fine aggregates and limestone powder substitution for cement
makes sense in concretes, saves money and energy, and reduces carbon dioxide
emissions. Furthermore, lime production involves energy-intensive process and
consumes water.
In 2004, ASTM International C150 allowed incorporation of 5% mass fraction of
limestone in ordinary Portland cement (ASTM, 2004). Hawkins et al. (2003) reported
that use of 5% limestone does not affect the performance of Portland cement. Bentz
et al. (2009) reported that higher limestone percentage can also be used in concrete
Fly Ash (FA), Egg Shell Powder (ESP), Compressive Strength, Split Tensile Strength and Flexural Strength