Surface area and size distribution of cement particles in hydrating paste as indicators for the conceptualization of a cement paste representative volume element

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378297%3A_____%2F22%3A00564010" target="_blank" >RIV/68378297:_____/22:00564010 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1016/j.cemconcomp.2022.104798" target="_blank" >https://doi.org/10.1016/j.cemconcomp.2022.104798</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.cemconcomp.2022.104798" target="_blank" >10.1016/j.cemconcomp.2022.104798</a>

Result language

angličtina

Original language name

Surface area and size distribution of cement particles in hydrating paste as indicators for the conceptualization of a cement paste representative volume element

Original language description

The conceptualization of a representative volume element (RVE) of hardened cement paste for numerical homogenization of mechanical problems rests on identifying the largest discernible microstructural feature, i.e. unreacted cement grains. While the particle size distribution (PSD) of anhydrous cement is a wellcontrolled production parameter, the size evolution of a representative cement grain throughout hydration remained unresolved. This study analyzes digitized 3D cement paste microstructures obtained from X-ray micro-computed tomography, coupled with CEMHYD3D hydration model, and segmented by image-processing tools, to obtain the full PSD and specific surface area evolutions of unreacted grains throughout hydration. Results provided indicate a representative grain size in the range of 30−40 μm regardless of hydration elapsed, implying a cement paste RVE should amount to 150−200 μm to realistically represent cement grains. The PSDnshape remained self-similar and two distinctive hydration regimes were identified, differing in dissolution rate and specific surface area decrease, correlating with calcium sulfate reactivity peak. Both measures provide easily accessible microstructural features that may be used for constructing artificial RVEs of hardened cement paste in micromechanical models and related simulations, resting on experimental data.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20505 - Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics; filled composites)

Project

<a href="/en/project/GJ19-25163Y" target="_blank" >GJ19-25163Y: Spatial distribution of hydration products in cement pastes</a><br>

Continuities

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

Publication year

2022

Confidentiality

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

Name of the periodical

Cement and Concrete Composites

ISSN

0958-9465

e-ISSN

1873-393X

Volume of the periodical

134

Issue of the periodical within the volume

November

Country of publishing house

GB - UNITED KINGDOM

Number of pages

14

Pages from-to

104798

UT code for WoS article

000883742100001

EID of the result in the Scopus database

2-s2.0-85140911941