Structural description of cement hydrates modified by incorporation of nanocomposites derived from lamellar double hydroxides

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F22%3A00372628" target="_blank" >RIV/68407700:21110/22:00372628 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.matpr.2022.02.465" target="_blank" >https://doi.org/10.1016/j.matpr.2022.02.465</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.matpr.2022.02.465" target="_blank" >10.1016/j.matpr.2022.02.465</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Structural description of cement hydrates modified by incorporation of nanocomposites derived from lamellar double hydroxides

Popis výsledku v původním jazyce

Calcium silicate hydrates (C-S-H) are the main phases resulting from the hydration of anhydrous Portland cement and on which the evolution of mechanical properties depends. This paper examines the mineralogy and structure of C-S-H in the presence of calcined Lamellar Double Hydroxides (LDH) based on Zn, Al and Ti. This nanocomposite was synthesized with success by the direct coprecipitation method and characterized by XRD. Different samples were prepared and characterized: clinker pastes with mixed oxides CZnAlTi varied from 0 to 5% by weight with a water/cement ratio of 0.4. The semi-quantitative analysis by XRD indicated that the basic elements of the synthesized powder interact in the C-S-H phases which come in different forms containing Al and Zn. The structures of the different C-S-H formed in the various clinker pastes have been presented. This part was focused on the drawn models describing the structural changes of C-S-H at the crystallographic level as a function of the calcium/silicon (Ca/Si) ratio and the incorporated Zn and Al elements. The structures were then interpreted and compared to correlate the structural changes of C-S-H. The results showed that the C-S-H phases having the highest Ca/Si ratios have the shortest octahedral calcium chains and therefore the interlayer spaces are smaller.Copyright (c) 2022 Elsevier Ltd. All rights reserved. Selection and peer-review under responsibility of the scientific committee of the 3rd International Congress on Materials & Structural Stability.

Název v anglickém jazyce

Structural description of cement hydrates modified by incorporation of nanocomposites derived from lamellar double hydroxides

Popis výsledku anglicky

Calcium silicate hydrates (C-S-H) are the main phases resulting from the hydration of anhydrous Portland cement and on which the evolution of mechanical properties depends. This paper examines the mineralogy and structure of C-S-H in the presence of calcined Lamellar Double Hydroxides (LDH) based on Zn, Al and Ti. This nanocomposite was synthesized with success by the direct coprecipitation method and characterized by XRD. Different samples were prepared and characterized: clinker pastes with mixed oxides CZnAlTi varied from 0 to 5% by weight with a water/cement ratio of 0.4. The semi-quantitative analysis by XRD indicated that the basic elements of the synthesized powder interact in the C-S-H phases which come in different forms containing Al and Zn. The structures of the different C-S-H formed in the various clinker pastes have been presented. This part was focused on the drawn models describing the structural changes of C-S-H at the crystallographic level as a function of the calcium/silicon (Ca/Si) ratio and the incorporated Zn and Al elements. The structures were then interpreted and compared to correlate the structural changes of C-S-H. The results showed that the C-S-H phases having the highest Ca/Si ratios have the shortest octahedral calcium chains and therefore the interlayer spaces are smaller.Copyright (c) 2022 Elsevier Ltd. All rights reserved. Selection and peer-review under responsibility of the scientific committee of the 3rd International Congress on Materials & Structural Stability.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20101 - Civil engineering

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název statě ve sborníku

Materials Today: Proceedings

ISBN

—

ISSN

2214-7853

e-ISSN

2214-7853

Počet stran výsledku

6

Strana od-do

1436-1441

Název nakladatele

Elsevier

Místo vydání

Lausanne

Místo konání akce

Rabat

Datum konání akce

24. 11. 2021

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000810903500025