Gamma ray and neutron shielding characteristics of polypropylene fiber-reinforced heavyweight concrete exposed to high temperatures
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Date
2020
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
ELSEVIER SCI LTD
Access Rights
info:eu-repo/semantics/closedAccess
Abstract
The residual properties of shielding structures need to be redefined after exposure to elevated temperatures due to their probable radiological hazards on biodiversity. In this study, the effect of high temperatures on mechanical, gamma ray and neutron attenuation characteristics was determined for limestone, barite and siderite concrete shields reinforced with polypropylene fiber. The increase in temperature up to 600 degrees C reduced the ultrasonic pulse velocity and compressive strength values of these shields by 59% and 62%, respectively. A good linear correlation (R-2 >= 0.97) was found between these values. While the gamma ray linear attenuation coefficients increased by 9% for barite concrete, and reduced by 15% for normal concrete and by 17% for siderite concrete at 600 degrees C, trivial fluctuations (from -1% to +7%) were observed at 300 degrees C. The neutron attenuation factors of these shields gradually reduced up to 31% with the increase of temperature. The performance of siderite concrete was found to be slightly better than that of barite concrete in terms of strength and neutron shielding characteristics. With the satisfactory linear attenuation coefficients at all energy levels of gamma rays, barite concrete seems to be the most suitable concrete type under high temperature risks. (C) 2020 Elsevier Ltd. All rights reserved.
Description
Keywords
Shielding of gamma rays and neutrons, Concrete shields, Limestone, Barite, Siderite, High temperature, Residual compressive strength
Journal or Series
CONSTRUCTION AND BUILDING MATERIALS
WoS Q Value
Q1
Scopus Q Value
Q1
Volume
257
Issue
Citation
closedAccess
