Mechanical properties of irradiated cement pastes for immobilization of evaporator concentrates

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26722445%3A_____%2F20%3AN0000029" target="_blank" >RIV/26722445:_____/20:N0000029 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21110/20:00341920

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/abs/pii/S014919702030189X" target="_blank" >https://www.sciencedirect.com/science/article/abs/pii/S014919702030189X</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.pnucene.2020.103437" target="_blank" >10.1016/j.pnucene.2020.103437</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Mechanical properties of irradiated cement pastes for immobilization of evaporator concentrates

Popis výsledku v původním jazyce

The effects of gamma irradiation on the properties of concrete or cement composites have been investigated by several authors. However, the behaviour of composites immobilizing radioactive evaporator concentrates may be significantly affected by the altered chemistry of the matrix material. A newly proposed binder intended for the development of a composite immobilizing evaporator concentrates was investigated in terms of changes in its' mechanical properties due to gamma irradiation. Three kinds of cement pastes - a reference Portland cement paste (PC), a proposed binder as a mix of cements (NP) and a mixture "NP" containing a model evaporator concentrate (NP_C) - were irradiated by gamma source Co-60 in two subsequent experiments differing in conditions - non-sealed (on air) and sealed (in a glass box). Surface cracks appeared on the NP and NP-C samples after the first irradiation experiment, i.e. in non-sealed conditions, due to drying effects supported by high ventilation in the irradiation chamber. In sealed conditions, some smaller surface cracks also appeared probably due to radiolysis of water present in the material, however they did not have any effects on the integrity of the internal structure of the pastes observed by non-destructive measurements. Compressive strength was enhanced by irradiation in all cases, only flexural strength decreased due to the presence of surface cracks. It should be noted that surface cracks appeared also on non-irradiated NP_C samples when left on air to dry. Therefore, further development of the cement composites will be focused on the elimination of any volume changes due to drying.

Název v anglickém jazyce

Mechanical properties of irradiated cement pastes for immobilization of evaporator concentrates

Popis výsledku anglicky

The effects of gamma irradiation on the properties of concrete or cement composites have been investigated by several authors. However, the behaviour of composites immobilizing radioactive evaporator concentrates may be significantly affected by the altered chemistry of the matrix material. A newly proposed binder intended for the development of a composite immobilizing evaporator concentrates was investigated in terms of changes in its' mechanical properties due to gamma irradiation. Three kinds of cement pastes - a reference Portland cement paste (PC), a proposed binder as a mix of cements (NP) and a mixture "NP" containing a model evaporator concentrate (NP_C) - were irradiated by gamma source Co-60 in two subsequent experiments differing in conditions - non-sealed (on air) and sealed (in a glass box). Surface cracks appeared on the NP and NP-C samples after the first irradiation experiment, i.e. in non-sealed conditions, due to drying effects supported by high ventilation in the irradiation chamber. In sealed conditions, some smaller surface cracks also appeared probably due to radiolysis of water present in the material, however they did not have any effects on the integrity of the internal structure of the pastes observed by non-destructive measurements. Compressive strength was enhanced by irradiation in all cases, only flexural strength decreased due to the presence of surface cracks. It should be noted that surface cracks appeared also on non-irradiated NP_C samples when left on air to dry. Therefore, further development of the cement composites will be focused on the elimination of any volume changes due to drying.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20305 - Nuclear related engineering; (nuclear physics to be 1.3);

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

Progress in Nuclear Energy

ISSN

0149-1970

e-ISSN

—

Svazek periodika

127

Číslo periodika v rámci svazku

September

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

10

Strana od-do

1-10

Kód UT WoS článku

000571796000005

EID výsledku v databázi Scopus

2-s2.0-85087917145