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| Naji, M. |
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| Ertürk, Emre |
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Załęgowski, Kamil
in Cooperation with on an Cooperation-Score of 37%
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Publications (7/7 displayed)
- 2020Influence of polymer modification on the microstructure of shielding concrete citations
- 2020Relation between microstructure, technical properties and neutron radiation shielding efficiency of concretecitations
- 2018Ultrasonic Quality Assessment of Polymer-Cement Concrete with Pet Waste as the Aggregatecitations
- 2015Properties of Cement Mortars Modified with Ceramic Waste Fillers citations
- 2015Tensile Properties of Polymer Repair Materials - effect of test parameters
- 2014Anodic polarization of nanocrystalline titaniumcitations
- 2014Chemical modification of nanocrystalline titanium surface for biological applications
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article
Relation between microstructure, technical properties and neutron radiation shielding efficiency of concrete
Abstract
The paper presents a study on the properties of New Generation Shielding Concrete (NGS-Concrete) modifiedby materials containing fast neutron moderators and thermal neutron absorbers. The reference ordinaryconcrete (OC) was modified by the change of the coarse aggregate from crushed granite to magnetiteone and cement from CEM III 42.5N to CEM I 42.5R. The addition of gadolinium oxide, polypropylenemacro- or/and microfibers, acrylic dispersion, acrylic dispersion together with gadolinium oxide, epoxydispersion, and finally the inorganic chemical compound containing boron (NaBH4) was used as well.The experimental program included: microstructure studies (analysis of fracture surface, visual andimage analysis of cross sections, observations using scanning electron microscopy – SEM, volume andabsolute density and total porosity calculated from gravimetric measurements), compressive strength,ultrasonic pulse velocity (UPV) as well as neutron radiation shielding efficiency measurement expressedas half value layer (HVL), determined by the neutron radiation equivalent dose reduction. The relationswere investigated using a multiple regression analysis of experimental results. A good correlationbetween the compressive strength and ultrasonic pulse velocity for all concretes was confirmed. The neutronradiation shielding efficiency expressed as HVL was mainly influenced by volume density (VD). Themathematical model HVL (VD) turned out to be the most reliable, whereas any other independent variableadded to this bivariate model was statistically not significant. It was concluded that neutron radiationshielding depends on the volume density of concrete, which is determined mainly by phase andatomic composition changes of aggregate and a lesser extent by microstructure changes