Effect of temperature on the early-stage hydration characteristics of Portland cement: a large-volume calorimetric study

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F12%3A00194298" target="_blank" >RIV/68407700:21110/12:00194298 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.conbuildmat.2012.06.025" target="_blank" >http://dx.doi.org/10.1016/j.conbuildmat.2012.06.025</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.conbuildmat.2012.06.025" target="_blank" >10.1016/j.conbuildmat.2012.06.025</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Effect of temperature on the early-stage hydration characteristics of Portland cement: a large-volume calorimetric study

Popis výsledku v původním jazyce

A large-volume isothermal heat flow calorimeter is applied for determination of the specific hydration heat power, N, and specific hydration heat, Q, of Portland cement CEM I 42.5 R as a function of time. The measurements are carried out for the cement paste with w/c = 0.3, 0.35, and 0.4 in the temperature range of 5 °C to 30 °C. Experimental results show that Q in the initial hydration phase (including C3A hydration and the dormant period up to the first local minimum on the N(t) curve) decreases two times when the temperature increases from 5 °C to 30 °C, and it is independent of w/c within the studied range. The second local maximum on the N(t) curve (corresponding to the C3S hydration phase) is four to five times higher for 30 °C as compared with 5°C, and it decreases up to 20% with increasing w/c; the time of its appearance is three times lower for 30 °C than 5 °C, and it is also independent of w/c. The apparent activation energy of the CEM I 42.5 R hydration is found independent

Název v anglickém jazyce

Effect of temperature on the early-stage hydration characteristics of Portland cement: a large-volume calorimetric study

Popis výsledku anglicky

A large-volume isothermal heat flow calorimeter is applied for determination of the specific hydration heat power, N, and specific hydration heat, Q, of Portland cement CEM I 42.5 R as a function of time. The measurements are carried out for the cement paste with w/c = 0.3, 0.35, and 0.4 in the temperature range of 5 °C to 30 °C. Experimental results show that Q in the initial hydration phase (including C3A hydration and the dormant period up to the first local minimum on the N(t) curve) decreases two times when the temperature increases from 5 °C to 30 °C, and it is independent of w/c within the studied range. The second local maximum on the N(t) curve (corresponding to the C3S hydration phase) is four to five times higher for 30 °C as compared with 5°C, and it decreases up to 20% with increasing w/c; the time of its appearance is three times lower for 30 °C than 5 °C, and it is also independent of w/c. The apparent activation energy of the CEM I 42.5 R hydration is found independent

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

JI - Kompositní materiály

OECD FORD obor

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Projekt

<a href="/cs/project/GBP105%2F12%2FG059" target="_blank" >GBP105/12/G059: Kumulativní časově závislé procesy ve stavebních materiálech a konstrukcích</a><br>

Návaznosti

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

Rok uplatnění

2012

Kód důvěrnosti údajů

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

Název periodika

Construction and Building Materials

ISSN

0950-0618

e-ISSN

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Svazek periodika

36

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

8

Strana od-do

969-976

Kód UT WoS článku

000310403900114

EID výsledku v databázi Scopus

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