UHPFRC at high temperatures – Simultaneous thermal analysis and thermodilatometry

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21610%2F16%3A00300230" target="_blank" >RIV/68407700:21610/16:00300230 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21110/16:00300230

Výsledek na webu

<a href="http://scitation.aip.org/content/aip/proceeding/aipcp/10.1063/1.4955259" target="_blank" >http://scitation.aip.org/content/aip/proceeding/aipcp/10.1063/1.4955259</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/1.4955259" target="_blank" >10.1063/1.4955259</a>

Jazyk výsledku

angličtina

Název v původním jazyce

UHPFRC at high temperatures – Simultaneous thermal analysis and thermodilatometry

Popis výsledku v původním jazyce

Simultaneous Thermal Analysis (STA) and Thermodilatometry Analysis (TDA) are done to reveal the structural and chemical changes in UHPFRC during its high-temperature load. Based on the measured results, several physical and chemical processes that studied material underwent at high-temperatures are recognized. In the temperature interval from 25 to 300 °C, the liberation of physically bound water from pores and the dehydration reaction of C-S-H take place. Additionally, AFt and AFm phases dehydrate at 110 – 156 °C. Endothermic peat at 460 °C corresponds to the portlandite decomposition. At 575 °C, the α -> β transformation of quartz is found. This reaction is accompanied by a sharp endothermic heat flow peak and a volume expansion, whereas no change of mass is measured. In the temperature interval 580-800 °C, the calcite and C-S-H gels decomposition is monitored. At the temperature above 800 °C, there is one significant exothermal peak corresponding to a crystallization of wollastonite. In summary, STA and TDA data pointed out the structural changes in studied UHPFRC and allowed identification of critical temperatures for its damage.

Název v anglickém jazyce

UHPFRC at high temperatures – Simultaneous thermal analysis and thermodilatometry

Popis výsledku anglicky

Simultaneous Thermal Analysis (STA) and Thermodilatometry Analysis (TDA) are done to reveal the structural and chemical changes in UHPFRC during its high-temperature load. Based on the measured results, several physical and chemical processes that studied material underwent at high-temperatures are recognized. In the temperature interval from 25 to 300 °C, the liberation of physically bound water from pores and the dehydration reaction of C-S-H take place. Additionally, AFt and AFm phases dehydrate at 110 – 156 °C. Endothermic peat at 460 °C corresponds to the portlandite decomposition. At 575 °C, the α -> β transformation of quartz is found. This reaction is accompanied by a sharp endothermic heat flow peak and a volume expansion, whereas no change of mass is measured. In the temperature interval 580-800 °C, the calcite and C-S-H gels decomposition is monitored. At the temperature above 800 °C, there is one significant exothermal peak corresponding to a crystallization of wollastonite. In summary, STA and TDA data pointed out the structural changes in studied UHPFRC and allowed identification of critical temperatures for its damage.

Druh

D - Stať ve sborníku

CEP obor

JI - Kompositní materiály

OECD FORD obor

—

Projekt

<a href="/cs/project/GA15-05791S" target="_blank" >GA15-05791S: Analýza fyzikálních a chemických procesů při vysokoteplotním zatížení vysokohodnotných cementových kompozitů s hybridní vláknovou výztuží</a><br>

Návaznosti

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

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název statě ve sborníku

THERMOPHYSICS 2016: 21ST INTERNATIONAL MEETING

ISBN

978-0-7354-1410-5

ISSN

0094-243X

e-ISSN

—

Počet stran výsledku

6

Strana od-do

—

Název nakladatele

AIP Publishing, APL, the American Institute of Physics

Místo vydání

Melville, NY

Místo konání akce

Terchová

Datum konání akce

12. 10. 2016

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000380816400031