Relation between microstructure, technical properties and neutron radiation shielding efficiency of concrete

Kamil Załęgowski , Tomasz Piotrowski , Andrzej Garbacz , Grzegorz Adamczewski

Abstract

The paper presents a study on the properties of New Generation Shielding Concrete (NGS-Concrete) modified by materials containing fast neutron moderators and thermal neutron absorbers. The reference ordinary concrete (OC) was modified by the change of the coarse aggregate from crushed granite to magnetite one and cement from CEM III 42.5N to CEM I 42.5R. The addition of gadolinium oxide, polypropylene macro- or/and microfibers, acrylic dispersion, acrylic dispersion together with gadolinium oxide, epoxy dispersion, and finally the inorganic chemical compound containing boron (NaBH4) was used as well. The experimental program included: microstructure studies (analysis of fracture surface, visual and image analysis of cross sections, observations using scanning electron microscopy – SEM, volume and absolute density and total porosity calculated from gravimetric measurements), compressive strength, ultrasonic pulse velocity (UPV) as well as neutron radiation shielding efficiency measurement expressed as half value layer (HVL), determined by the neutron radiation equivalent dose reduction. The relations were investigated using a multiple regression analysis of experimental results. A good correlation between the compressive strength and ultrasonic pulse velocity for all concretes was confirmed. The neutron radiation shielding efficiency expressed as HVL was mainly influenced by volume density (VD). The mathematical model HVL (VD) turned out to be the most reliable, whereas any other independent variable added to this bivariate model was statistically not significant. It was concluded that neutron radiation shielding depends on the volume density of concrete, which is determined mainly by phase and atomic composition changes of aggregate and a lesser extent by microstructure changes
Author Kamil Załęgowski (FCE / ICE)
Kamil Załęgowski,,
- The Institute of Civil Engineering
, Tomasz Piotrowski (FCE / ICE)
Tomasz Piotrowski,,
- The Institute of Civil Engineering
, Andrzej Garbacz (FCE / ICE)
Andrzej Garbacz,,
- The Institute of Civil Engineering
, Grzegorz Adamczewski (FCE / ICE)
Grzegorz Adamczewski,,
- The Institute of Civil Engineering
Journal seriesConstruction and Building Materials, ISSN 0950-0618, e-ISSN 1879-0526, (N/A 140 pkt)
Issue year2020
No235
Pages1-20
Publication size in sheets0.95
Keywords in Polishwytrzymałość betonu
Keywords in EnglishRadiation shielding, Neutron radiation, Microstructure
ASJC Classification2205 Civil and Structural Engineering; 2215 Building and Construction; 2500 General Materials Science
DOIDOI:10.1016/j.conbuildmat.2019.117389
Languageen angielski
File
Relation between.pdf 7.43 MB
Score (nominal)140
Score sourcejournalList
ScoreMinisterial score = 140.0, 12-12-2019, ArticleFromJournal
Publication indicators Scopus SNIP (Source Normalised Impact per Paper): 2018 = 2.369; WoS Impact Factor: 2018 = 4.046 (2) - 2018=4.685 (5)
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