TY - GEN
T1 - Calcium nitrate counteracting PCE superplasticizer retardation
AU - Lesage, Karel
AU - Cizer, Özlem
AU - De Schutter, Geert
AU - Desmet, Bram
AU - Vantomme, John
AU - Vandewalle, Lucie
PY - 2012
Y1 - 2012
N2 - Calcium nitrate (CN) has been used as a cement hydration accelerator in varying dosages in order to explore its potential to compensate hydration retardation caused by a polycarboxylic ether (PCE) superplasticizer. The initial setting time, obtained from Vicat needle penetration tests, was found to decrease for increasing CN dosage until 4 percent of the cement mass was added. For dosages beyond this amount, the initial setting time slightly increased. The detected alite and aluminate hydration products appeared to have an influence on the structure evolution during setting. It is assumed that the AFt needles destruct the C-S-H network, which could lead to lower needle penetration resistance.
AB - Calcium nitrate (CN) has been used as a cement hydration accelerator in varying dosages in order to explore its potential to compensate hydration retardation caused by a polycarboxylic ether (PCE) superplasticizer. The initial setting time, obtained from Vicat needle penetration tests, was found to decrease for increasing CN dosage until 4 percent of the cement mass was added. For dosages beyond this amount, the initial setting time slightly increased. The detected alite and aluminate hydration products appeared to have an influence on the structure evolution during setting. It is assumed that the AFt needles destruct the C-S-H network, which could lead to lower needle penetration resistance.
KW - Calcium nitrate
KW - Hydration accelerations
KW - Superplasticizer retardation
UR - http://www.scopus.com/inward/record.url?scp=84875734974&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84875734974
SN - 9781622766406
T3 - American Concrete Institute, ACI Special Publication
SP - 89
EP - 101
BT - 10th International Conference on Superplasticizers and Other Chemical Admixtures 2012
T2 - 10th International Conference on Superplasticizers and Other Chemical Admixtures 2012
Y2 - 28 October 2012 through 31 October 2012
ER -