NEUTRON TRANSMISSION CHARACTERISTICS OF SELFCOMPACTING CONCRETE WITH COARSE AGGREGATE SAMPLES OF KARNATAKA

Pai, B.H.V and Nandy, M and Krishnamoorthy, A and Subbaiah, K . V and Sarkar, P. K. (2015) NEUTRON TRANSMISSION CHARACTERISTICS OF SELFCOMPACTING CONCRETE WITH COARSE AGGREGATE SAMPLES OF KARNATAKA. In: Proceedings, NSRP-20, 28-30,October, Mangalore.

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Abstract

Concrete structures built to contain radiation at nuclear installations are designed to resist seismic loads requiring higher percentages of steel reinforcements and leading to possible congestion at the member junctions. The use of mechanical vibrators for compacting the concrete mix in such situations is difficult. This problem can be effectively solved with the use self-compacting concrete (SCC), which is a type of concrete that can flow and consolidate into the structural formwork all by itself. In this work, SCC of grades M25 and M30 was prepared using nine different types of stone chips or coarse aggregate (CA) samples procured from various geological formations in the state of Karnataka; rectangular slabs were cast, and subjected to neutron transmission studies. A collimated neutron beam originating from a 592 GBq Am-Be neutron source was used for the purpose. Linear attenuation coefficients (LACs) and half value layer (HVL)thicknesses of the SCC mixes were obtained by measuring the transmitted neutron dose rates.Empirical relationships were established between the LACs of the SCC mixes with density, and properties of CA samples.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Neutron transmission, Self-compacting concrete, Coarse Aggregate, Linear attenuation coefficient, Half value layer.
Subjects: Departments at MU > Manipal Centre for Natural Sciences
Depositing User: MCNS Editor
Date Deposited: 09 Nov 2015 15:33
Last Modified: 09 Nov 2015 15:33
URI: http://eprints.manipal.edu/id/eprint/144535

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