Scaling of strength in hardened cement pastes - Unveiling the role of microstructural defects and the susceptibility of C-S-H gel to physical/chemical degradation by multiscale modeling

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378297%3A_____%2F22%3A00552135" target="_blank" >RIV/68378297:_____/22:00552135 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.cemconres.2022.106714" target="_blank" >https://doi.org/10.1016/j.cemconres.2022.106714</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.cemconres.2022.106714" target="_blank" >10.1016/j.cemconres.2022.106714</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Scaling of strength in hardened cement pastes - Unveiling the role of microstructural defects and the susceptibility of C-S-H gel to physical/chemical degradation by multiscale modeling

Popis výsledku v původním jazyce

The scaling of strength across hierarchically structured composite materials is accented by the presence of defects with distinct morphology and origin appearing within the microstructure. In hardened Portland cement pastes, these defects manifest as capillary pores, microcracks, and air voids. The transition of material strength from the nano-to-microscale is bridged in the present paper by a validated computational model based on a hierarchical representation of the paste microstructure, resting solely on realistic microstructural features. The model unravels and quantifies the strength scaling mechanisms arising from the various types of defects and critically assesses the susceptibility of C-S-H gel to physical and/or chemical deterioration, quantifying their impact on the gel's structural integrity which subsequently projects as a decrease of the material's load-bearing capacity. The fully-developed model is subsequently used as a quantitative tool to assess the strength degradation of cement paste exposed to a magnesium sulfate attack occurring at low temperature.

Název v anglickém jazyce

Scaling of strength in hardened cement pastes - Unveiling the role of microstructural defects and the susceptibility of C-S-H gel to physical/chemical degradation by multiscale modeling

Popis výsledku anglicky

The scaling of strength across hierarchically structured composite materials is accented by the presence of defects with distinct morphology and origin appearing within the microstructure. In hardened Portland cement pastes, these defects manifest as capillary pores, microcracks, and air voids. The transition of material strength from the nano-to-microscale is bridged in the present paper by a validated computational model based on a hierarchical representation of the paste microstructure, resting solely on realistic microstructural features. The model unravels and quantifies the strength scaling mechanisms arising from the various types of defects and critically assesses the susceptibility of C-S-H gel to physical and/or chemical deterioration, quantifying their impact on the gel's structural integrity which subsequently projects as a decrease of the material's load-bearing capacity. The fully-developed model is subsequently used as a quantitative tool to assess the strength degradation of cement paste exposed to a magnesium sulfate attack occurring at low temperature.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

<a href="/cs/project/GJ18-26056Y" target="_blank" >GJ18-26056Y: Experimentální kvantifikace a modelování degradace směsných cementových past s příměsí vápence vlivem síranové koroze za vzniku thaumasitu</a><br>

Návaznosti

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

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Cement and Concrete Research

ISSN

0008-8846

e-ISSN

1873-3948

Svazek periodika

154

Číslo periodika v rámci svazku

April

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

19

Strana od-do

106714

Kód UT WoS článku

000797822400006

EID výsledku v databázi Scopus

2-s2.0-85122937404