Nanomechanical analysis of Gamma-irradiated cement paste exposed to different humidities

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26722445%3A_____%2F23%3AN0000025" target="_blank" >RIV/26722445:_____/23:N0000025 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21110/23:00367154

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0950061823016835" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0950061823016835</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.conbuildmat.2023.131969" target="_blank" >10.1016/j.conbuildmat.2023.131969</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Nanomechanical analysis of Gamma-irradiated cement paste exposed to different humidities

Popis výsledku v původním jazyce

The paper characterizes concurrent effects of gamma-irradiation and presence of water in Portland cement pastes. An extensive nanomechanical quantification (Young's modulus, hardness, and creep compliance) at two scales is performed after exposure to two gamma-ray doses and a wide range of relative humidities (RH 0%-100%). Competing microstructural mechanisms such as water radiolysis, hydration, carbonation and drying were identified and their effects de-coupled with the aid of nanoindentation and other supporting techniques. Maximum radiation resistance was found for samples in medium humidities (33%-57%). Samples irradiated below 11% RH exhibited compaction of C-S-H phases at the level of 100 nm, & SIM; 25% increase of Young's modulus and decrease of creep compliance due to water radiolysis and drying. The compaction resulted in microcracking at higher paste scale and caused & SIM; 17% decrease of elastic modulus. Samples irradiated in water showed large (& SIM; 26%) decrease of Young's modulus and increased creep compliance accompanied by 9%-10% Portlandite loss.

Název v anglickém jazyce

Nanomechanical analysis of Gamma-irradiated cement paste exposed to different humidities

Popis výsledku anglicky

The paper characterizes concurrent effects of gamma-irradiation and presence of water in Portland cement pastes. An extensive nanomechanical quantification (Young's modulus, hardness, and creep compliance) at two scales is performed after exposure to two gamma-ray doses and a wide range of relative humidities (RH 0%-100%). Competing microstructural mechanisms such as water radiolysis, hydration, carbonation and drying were identified and their effects de-coupled with the aid of nanoindentation and other supporting techniques. Maximum radiation resistance was found for samples in medium humidities (33%-57%). Samples irradiated below 11% RH exhibited compaction of C-S-H phases at the level of 100 nm, & SIM; 25% increase of Young's modulus and decrease of creep compliance due to water radiolysis and drying. The compaction resulted in microcracking at higher paste scale and caused & SIM; 17% decrease of elastic modulus. Samples irradiated in water showed large (& SIM; 26%) decrease of Young's modulus and increased creep compliance accompanied by 9%-10% Portlandite loss.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

<a href="/cs/project/GA23-05435S" target="_blank" >GA23-05435S: Účinky radiačního působení na nanomechanické vlastnosti cementových kompozitů v proměnných podmínkách prostředí</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název periodika

Construction and Building Materials

ISSN

0950-0618

e-ISSN

1879-0526

Svazek periodika

393

Číslo periodika v rámci svazku

August

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

16

Strana od-do

1-16

Kód UT WoS článku

001024753300001

EID výsledku v databázi Scopus

2-s2.0-85161629740