Effect of w/c and temperature on the early-stage hydration heat development in Portland-limestone cement

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F14%3A00211213" target="_blank" >RIV/68407700:21110/14:00211213 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.conbuildmat.2013.09.020" target="_blank" >http://dx.doi.org/10.1016/j.conbuildmat.2013.09.020</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.conbuildmat.2013.09.020" target="_blank" >10.1016/j.conbuildmat.2013.09.020</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Effect of w/c and temperature on the early-stage hydration heat development in Portland-limestone cement

Popis výsledku v původním jazyce

The early-stage hydration heat characteristics of the blended binder containing 80% of Portland cement CEM I 42.5 R and 20% of limestone are studied in a dependence on w/c and temperature. The specific hydration heat power and the specific hydration heatare monitored over the time period of 72 h using an isothermal heat flow calorimeter. Experimental results show an active role of limestone in the hydration process. After 72 h its net contribution to the specific hydration heat of the blended binder, QL, is significant for all studied combinations of w/c and temperature. At 20 C QL is more pronounced for w/c = 0.35 (51.8 J/g-binder) than w/c = 0.50 (41.8 J/g-binder), contrary to 35 C where a dependence of QL on w/c is not evidenced (34.6 J/g-binder for w/c = 0.35 and 35.5 J/g-binder for w/c = 0.50). Unlike the reference Portland cement, the apparent activation energy of the analyzed Portland-limestone cement is found to depend on w/c; for w/c = 0.5 it is 35.7 kJ/mol while for w/c = 0.

Název v anglickém jazyce

Effect of w/c and temperature on the early-stage hydration heat development in Portland-limestone cement

Popis výsledku anglicky

The early-stage hydration heat characteristics of the blended binder containing 80% of Portland cement CEM I 42.5 R and 20% of limestone are studied in a dependence on w/c and temperature. The specific hydration heat power and the specific hydration heatare monitored over the time period of 72 h using an isothermal heat flow calorimeter. Experimental results show an active role of limestone in the hydration process. After 72 h its net contribution to the specific hydration heat of the blended binder, QL, is significant for all studied combinations of w/c and temperature. At 20 C QL is more pronounced for w/c = 0.35 (51.8 J/g-binder) than w/c = 0.50 (41.8 J/g-binder), contrary to 35 C where a dependence of QL on w/c is not evidenced (34.6 J/g-binder for w/c = 0.35 and 35.5 J/g-binder for w/c = 0.50). Unlike the reference Portland cement, the apparent activation energy of the analyzed Portland-limestone cement is found to depend on w/c; for w/c = 0.5 it is 35.7 kJ/mol while for w/c = 0.

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

2014

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

50

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

8

Strana od-do

140-147

Kód UT WoS článku

000330489200016

EID výsledku v databázi Scopus

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