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

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About: Effect of w/c and temperature on the early-stage hydration heat development in Portland-limestone cement Goto Sponge NotDistinct Permalink

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
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. (en)
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 (en)
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 (en)
skos:notation	RIV/68407700:21110/14:00211213!RIV15-GA0-21110___
http://linked.open...avai/riv/aktivita	P
http://linked.open...avai/riv/aktivity	P(GBP105/12/G059)
http://linked.open...iv/cisloPeriodika	1
http://linked.open...vai/riv/dodaniDat	2015
http://linked.open...aciTvurceVysledku	Černý, Robert Tydlitát, Vratislav Matas, Tomáš
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	České vysoké učení technické v Praze / Fakulta stavební
http://linked.open...dnocenehoVysledku	13601
http://linked.open...ai/riv/idVysledku	RIV/68407700:21110/14:00211213
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Portland cement; Limestone; Hydration heat; Isothermal heat flow calorimeter; Temperature; w/c; Activation energy (en)
http://linked.open.../riv/klicoveSlovo	Activation energy Isothermal heat flow calorimeter Temperature Limestone w/c Portland cement Hydration heat
http://linked.open...odStatuVydavatele	GB - Spojené království Velké Británie a Severního Irska
http://linked.open...ontrolniKodProRIV	[9F4CCBD61362]
http://linked.open...i/riv/nazevZdroje	Construction and Building Materials
http://linked.open...in/vavai/riv/obor	JI
http://linked.open...ichTvurcuVysledku	3 (xsd:int)
http://linked.open...cetTvurcuVysledku	3 (xsd:int)
http://linked.open...vavai/riv/projekt	Cumulative time dependent processes in building materials and structures
http://linked.open...UplatneniVysledku	2014
http://linked.open...v/svazekPeriodika	50
http://linked.open...iv/tvurceVysledku	Černý, Robert Matas, Tomáš Tydlitát, Vratislav
http://linked.open...ain/vavai/riv/wos	000330489200016
issn	0950-0618
number of pages	8 (xsd:int)
http://bibframe.org/vocab/doi	10.1016/j.conbuildmat.2013.09.020
http://localhost/t...ganizacniJednotka	21110

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