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Shrinkage Study and Strength Aspects of Concrete with Foundry Sand and Coconut Shell as a Partial Replacement for

Kalyana Chakravarthy Polichetty Raja1, Ilango Thaniarasu1, Mohamed Abdelghany Elkotb2,3

  • 1Department of Civil Engineering, Vels Institute of Science, Technology & Advanced Studies, Chennai 600117, India.

Materials (Basel, Switzerland)
|December 10, 2021
PubMed

Keywords:
coconut shellconcreteshrinkagewaste foundry sand

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Shrinkage in concrete is primarily due to water loss from evaporation, hydration of cement, or carbonation, leading to a reduction in volume. The volumetric contraction results in volumetric strain in concrete. However, in practice, shrinkage is measured as linear strain, which is one-third of the volumetric strain.
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Deleterious substances in aggregates can be detrimental to the quality and durability of concrete. These substances include organic impurities like loam, which interfere with cement hydration and are usually present in the sand. These prevent a good bond between aggregate and cement paste. Organic impurities can be detected using the colorimetric test, where the darkness of a solution after agitation indicates the level of organic content.
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