Microstructural and micro-mechanical property changes of cement pastes for ILW immobilization due to irradiation

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26722445%3A_____%2F20%3AN0000015" target="_blank" >RIV/26722445:_____/20:N0000015 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61388980:_____/20:00531481 RIV/68407700:21110/20:00341993

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/abs/pii/S0022311520301951" target="_blank" >https://www.sciencedirect.com/science/article/abs/pii/S0022311520301951</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jnucmat.2020.152346" target="_blank" >10.1016/j.jnucmat.2020.152346</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Microstructural and micro-mechanical property changes of cement pastes for ILW immobilization due to irradiation

Popis výsledku v původním jazyce

While degradation of concrete due to irradiation is a widely studied subject, the deterioration and changes in microstructure of cement pastes immobilizing evaporator concentrates due to gamma radiation is a very specific subject because of the nature of the solidified radioactive waste. The cement paste proposed as possibly suitable binder for cementitious composites immobilizing evaporator concentrates (marked as NP in further text), a paste with the same composition but mixed with simulated evaporator concentrates (NP_C) and a reference paste (PC) were subjected to gamma irradiation from Co-60 source at doses of 2 MGy and studied in terms of microstructure changes using Scanning Electron Microscopy (SEM) with Energy Dispersive X-ray Spectroscopy (EDX), X-ray diffraction (XRD) and nanoindentation. SEM-EDX revealed rise of new phases on the NP_C samples rich in Na+ compounds due to the irradiation. Results from nanoindentation indicated a formation of carbonates in the irradiated samples, but XRD analysis did not find a significant rise in CaCO3 minerals. The possible explanation is a rise of alkali carbonates in their amorphous form.

Název v anglickém jazyce

Microstructural and micro-mechanical property changes of cement pastes for ILW immobilization due to irradiation

Popis výsledku anglicky

While degradation of concrete due to irradiation is a widely studied subject, the deterioration and changes in microstructure of cement pastes immobilizing evaporator concentrates due to gamma radiation is a very specific subject because of the nature of the solidified radioactive waste. The cement paste proposed as possibly suitable binder for cementitious composites immobilizing evaporator concentrates (marked as NP in further text), a paste with the same composition but mixed with simulated evaporator concentrates (NP_C) and a reference paste (PC) were subjected to gamma irradiation from Co-60 source at doses of 2 MGy and studied in terms of microstructure changes using Scanning Electron Microscopy (SEM) with Energy Dispersive X-ray Spectroscopy (EDX), X-ray diffraction (XRD) and nanoindentation. SEM-EDX revealed rise of new phases on the NP_C samples rich in Na+ compounds due to the irradiation. Results from nanoindentation indicated a formation of carbonates in the irradiated samples, but XRD analysis did not find a significant rise in CaCO3 minerals. The possible explanation is a rise of alkali carbonates in their amorphous form.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Nuclear Materials

ISSN

0022-3115

e-ISSN

1873-4820

Svazek periodika

540

Číslo periodika v rámci svazku

November

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

8

Strana od-do

1-8

Kód UT WoS článku

000575163800010

EID výsledku v databázi Scopus

2-s2.0-85088640464