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Statements

Subject Item
n2:RIV%2F68407700%3A21110%2F14%3A00211213%21RIV15-GA0-21110___
rdf:type
n6:Vysledek skos:Concept
dcterms:description
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 heat are 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 = 0.35 only 28.0 kJ/mol. 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 heat are 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 = 0.35 only 28.0 kJ/mol.
dcterms:title
Effect of w/c and temperature on the early-stage hydration heat development in Portland-limestone cement Effect of w/c and temperature on the early-stage hydration heat development in Portland-limestone cement
skos:prefLabel
Effect of w/c and temperature on the early-stage hydration heat development in Portland-limestone cement Effect of w/c and temperature on the early-stage hydration heat development in Portland-limestone cement
skos:notation
RIV/68407700:21110/14:00211213!RIV15-GA0-21110___
n3:aktivita
n13:P
n3:aktivity
P(GBP105/12/G059)
n3:cisloPeriodika
1
n3:dodaniDat
n5:2015
n3:domaciTvurceVysledku
n11:3438945 n11:6743676 n11:2724448
n3:druhVysledku
n15:J
n3:duvernostUdaju
n7:S
n3:entitaPredkladatele
n17:predkladatel
n3:idSjednocenehoVysledku
13601
n3:idVysledku
RIV/68407700:21110/14:00211213
n3:jazykVysledku
n16:eng
n3:klicovaSlova
Portland cement; Limestone; Hydration heat; Isothermal heat flow calorimeter; Temperature; w/c; Activation energy
n3:klicoveSlovo
n4:Isothermal%20heat%20flow%20calorimeter n4:Temperature n4:w%2Fc n4:Hydration%20heat n4:Limestone n4:Portland%20cement n4:Activation%20energy
n3:kodStatuVydavatele
GB - Spojené království Velké Británie a Severního Irska
n3:kontrolniKodProRIV
[9F4CCBD61362]
n3:nazevZdroje
Construction and Building Materials
n3:obor
n19:JI
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
3
n3:projekt
n14:GBP105%2F12%2FG059
n3:rokUplatneniVysledku
n5:2014
n3:svazekPeriodika
50
n3:tvurceVysledku
Černý, Robert Tydlitát, Vratislav Matas, Tomáš
n3:wos
000330489200016
s:issn
0950-0618
s:numberOfPages
8
n12:doi
10.1016/j.conbuildmat.2013.09.020
n18:organizacniJednotka
21110