Thermal stability of the phases developed at high-pressure hydrothermal curing of class G cement with different pozzolanic and latent hydraulic additives

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26310%2F22%3APU146939" target="_blank" >RIV/00216305:26310/22:PU146939 - isvavai.cz</a>

Výsledek na webu

<a href="https://link.springer.com/article/10.1007/s10973-022-11254-2" target="_blank" >https://link.springer.com/article/10.1007/s10973-022-11254-2</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10973-022-11254-2" target="_blank" >10.1007/s10973-022-11254-2</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Thermal stability of the phases developed at high-pressure hydrothermal curing of class G cement with different pozzolanic and latent hydraulic additives

Popis výsledku v původním jazyce

Multicomponent cement pastes based on the Class G cement substituted by 30 mass% of binary or ternary mixtures of silica fume (SF), metakaolin (MK), and ground granulated blast-furnace slag (BFS) were submitted to hydrothermal curing at 150 degrees C and 18 MPa for 7 days. X-ray diffraction (XRD), Fourier Transform Infrared analyses in the mid-IR region (FTIR), and thermogravimetric-differential scanning calorimetry (TGA/DSC) were performed for evaluation of phase compositions and to assess their relation to compressive strength. The highest amount of mainly amorphous thermal stable C-S-H and C-A-(S)-H phases with the highest polymerization degree was formed by using 15 mass% SF-15 mass% MK mixture, which led to the lowest CaO/SiO2 (C/S) ratio and the highest compressive strength. Crystalline phases detected in this sample were also thermal stable tobermorite, hibschite, and katoite. The increase in the C/S ratio, as well as slowly reacting BFS, resulted in the transformation of polymerized structures of hydration products to the smaller units and lower degree of hydration followed by decreased compressive strength values. Undesired formation of crystalline alpha-C2SH, occurring also in the paste without additives addition, was proved in the composition with a higher amount of BFS and higher C/S ratio.

Název v anglickém jazyce

Thermal stability of the phases developed at high-pressure hydrothermal curing of class G cement with different pozzolanic and latent hydraulic additives

Popis výsledku anglicky

Multicomponent cement pastes based on the Class G cement substituted by 30 mass% of binary or ternary mixtures of silica fume (SF), metakaolin (MK), and ground granulated blast-furnace slag (BFS) were submitted to hydrothermal curing at 150 degrees C and 18 MPa for 7 days. X-ray diffraction (XRD), Fourier Transform Infrared analyses in the mid-IR region (FTIR), and thermogravimetric-differential scanning calorimetry (TGA/DSC) were performed for evaluation of phase compositions and to assess their relation to compressive strength. The highest amount of mainly amorphous thermal stable C-S-H and C-A-(S)-H phases with the highest polymerization degree was formed by using 15 mass% SF-15 mass% MK mixture, which led to the lowest CaO/SiO2 (C/S) ratio and the highest compressive strength. Crystalline phases detected in this sample were also thermal stable tobermorite, hibschite, and katoite. The increase in the C/S ratio, as well as slowly reacting BFS, resulted in the transformation of polymerized structures of hydration products to the smaller units and lower degree of hydration followed by decreased compressive strength values. Undesired formation of crystalline alpha-C2SH, occurring also in the paste without additives addition, was proved in the composition with a higher amount of BFS and higher C/S ratio.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20303 - Thermodynamics

Projekt

<a href="/cs/project/GA19-16646S" target="_blank" >GA19-16646S: Potlačení negativního vlivu zinku v Portlandském cementu pomocí akcelerátorů hydratace</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

Journal of Thermal Analysis and Calorimetry

ISSN

1388-6150

e-ISSN

1588-2926

Svazek periodika

147

Číslo periodika v rámci svazku

18

Stát vydavatele periodika

HU - Maďarsko

Počet stran výsledku

12

Strana od-do

9891-9902

Kód UT WoS článku

000758983300002

EID výsledku v databázi Scopus

2-s2.0-85124876620