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A platform for research: civil engineering, architecture and urbanism
Technical calcium as set accelerator for cement at low temperatures
The objective was to test the efficiency of technical calcium nitrate (CN) as a set accelerator for different cements at low temperatures (5 deg C to 7 deg C). The applied dosages were 0.00 %, 1.55 %, 2.32 %, 3.10 %, 3,86 % and 7.73 % CN of the cement weight, corresponding to 0.00 %, 1.00 %, 1.50 %, 2.00 %, 2.50 % and 5.00 % NO3(-), respectively. Five different Portland cements were chosen covering a wide range in (3CaO)(Al2O3) contents, since it was initially believed that the set regulation mechanism involved (3CaO)(Al2O3) (i. e. the efficiency depend on the (3CaO)(Al2O3) content). The setting characteristics of the cement pastes with w/c= 0.40 were determined by an automativ Vicat-needle apparatus in a room with an ambient temperature of 5 deg C to 7 deg C. The results revealed that the set acceleration efficiency of CN depended very much on the cement type. However, no correlation with the (3CaO)(Al2O3) content was found. On the other hand, the set accelerator efficiency of CN seems to increase with increasing belite content according to the Bogue analyses of the cements, or other cement characteristica promoting belite formation in the clinker process.
Technical calcium as set accelerator for cement at low temperatures
The objective was to test the efficiency of technical calcium nitrate (CN) as a set accelerator for different cements at low temperatures (5 deg C to 7 deg C). The applied dosages were 0.00 %, 1.55 %, 2.32 %, 3.10 %, 3,86 % and 7.73 % CN of the cement weight, corresponding to 0.00 %, 1.00 %, 1.50 %, 2.00 %, 2.50 % and 5.00 % NO3(-), respectively. Five different Portland cements were chosen covering a wide range in (3CaO)(Al2O3) contents, since it was initially believed that the set regulation mechanism involved (3CaO)(Al2O3) (i. e. the efficiency depend on the (3CaO)(Al2O3) content). The setting characteristics of the cement pastes with w/c= 0.40 were determined by an automativ Vicat-needle apparatus in a room with an ambient temperature of 5 deg C to 7 deg C. The results revealed that the set acceleration efficiency of CN depended very much on the cement type. However, no correlation with the (3CaO)(Al2O3) content was found. On the other hand, the set accelerator efficiency of CN seems to increase with increasing belite content according to the Bogue analyses of the cements, or other cement characteristica promoting belite formation in the clinker process.
Technical calcium as set accelerator for cement at low temperatures
Einsatz von technischem Calciumnitrat als Abbindebeschleuniger für Zement bei niedrigen Temperaturen
Justnes, H. (author) / Nygaard, E.C. (author)
Cement and Concrete Research ; 25 ; 1766-1774
1995
9 Seiten, 5 Bilder, 1 Tabelle, 23 Quellen
Article (Journal)
English
Technical Calcium Nitrate as Set Accelerator for Cement at Low Temperatures
| Online Contents | 1995
Technical Calcium Nitrate as Set Accelerator for Cement at Low Temperatures
| British Library Online Contents | 1995
Technical calcium nitrate as set accelerator for cement pastes at low temperatures
| Online Contents | 1996
Calcium chloride as accelerator for Portland cement
| Engineering Index Backfile | 1939