Abstract
The objective was to test the efficiency of technical calcium nitrate (CN) as a set accelerator for different cements at low temperatures (5–7 °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 C3A contents, since it was initially believed that the set regulating mechanism involved C3A (i.e. the efficiency depend on the C3A content). The setting characteristics of the cement pastes with wc = 0.40 were determined by an automatic Vicat-needle apparatus in a room with an ambient temperature of 5–7 dgC. The results revealed that the set accelerating efficiency of CN depended very much on the cement type. However, no correlation with the C3A 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.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
