Study of durability and temperature effect on compressive strength of concrete containing corn cob ash
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Date
2018
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Punjab Agricultural University, Ludhiana
Abstract
Carbon dioxide is emitted during manufacturing processes of cement. It can be reduced to
some extent either by limiting the use of cement or by replacing it with other eco-friendly
material within certain limits. The present study was conducted to replace the Ordinary
Portland Cement (OPC) with Corn Cob Ash (CCA) up to 20%. The workability, compressive
strength, temperature effect and durability tests were conducted on concrete containing CCA.
The use of CCA above 10% as a replacement of cement decreases the workability as well as
the strength of concrete. Reduction in strength was small for the replacement level of 5% and
10%. The CCA as a replacement above 10% is not recommended as it affects the strength of
concrete. The compressive strength of all mixes increases up to temperature of 300°C.
Beyond this temperature, compressive strength decreases significantly for all the mixes. The
serious deterioration has found at 600°C. Durability test was conducted at 3% and 5%
concentration of sulphuric acid. Increase in acid concentration deteriorates the compressive
strength of normal as well as CCA concrete. The increase in CCA content in concrete shows
increase in its resistance to sulphuric acid at 3% concentration. The resistance of concrete to
5% H2SO4 solution decreases as CCA content increases in mixes. It can be seen that the
curing age and addition of CCA content significantly affect the 28 days compressive strength
at both normal and elevated temperature.
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