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Thermal Effect on Micro Properties of Granite Aggregate in Concrete

Guruprasad, Y K and Ramaswamy, Ananth and Sajeev, K (2018) Thermal Effect on Micro Properties of Granite Aggregate in Concrete. In: ACI MATERIALS JOURNAL, 115 (1). pp. 77-88.

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Official URL: http://dx.doi.org/10.14359/51701004


Identification and selection of the type of rock used as coarse aggregate in concrete exposed to high temperature is important from a standpoint of strength and safety of existing concrete structures. The present work documents the microscale behavior of granite coarse aggregates and its influence on strength parameters of concrete, exposed to different temperatures ranging from 425 to 850 degrees C (797 to 1562 degrees F) for an exposure time of 2 to 4 hours. Factors leading to decomposition of coarse aggregates in concrete under thermal loads were obtained using petrographical scannign electron microscopy (SEM) and electron probe micro analysis (EPMA) techniques. At temperatures ranging from 425 to 550 degrees C (797 to 1022 degrees F), the damage in concrete is gradual and is attributable to mortar shrinkage and separation of mortar-aggregate interface. Thermodynamic modeling results have shown that, beyond the formation temperature (715 degrees C 1319 degrees F]), minerals in the rock start to melt and migrate along the fracture planes, causing sudden reduction in load-carrying capacity in concrete.

Item Type: Journal Article
Additional Information: Copy right for the article belong to AMER CONCRETE INST, 38800 COUNTRY CLUB DR, FARMINGTON HILLS, MI 48331 USA
Department/Centre: Division of Mechanical Sciences > Centre for Earth Sciences
Division of Mechanical Sciences > Divecha Centre for Climate Change
Depositing User: Id for Latest eprints
Date Deposited: 13 Apr 2018 19:58
Last Modified: 13 Apr 2018 19:58
URI: http://eprints.iisc.ac.in/id/eprint/59539

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