ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 42, (3) 105 - 111 (1998)


INVESTIGATIONS OF BLENDED LOW ENERGY CEMENTS
 
Palou Martin T. 1, Majling Ján 1, Janotka Ivan 2, Dan Elena 3, Popescu Dorel 4
 
1 Faculty of Chemical Technology, STU, Radlinského 9, 812 37 Bratislava, Slovak Republic
2 Institute of Construction and Architecture, SAV, 842 36 Dubravská cesta, Bratislava, Slovak Republic
3 Procelia-Brasov. Brasov 2200 Romania
4 Cimus-Campulung S.A, Campulung-Arges 0425, Romcnia

Three kinds of Low Energy Cement (LEC) were prepared at lower temperatures than those necessary for the production of Ordinary Portland Cement - a high content Belite Cement (HBC) produced in a cement plant at 1260 °C and two kinds of Sulfoaluminate Belite Cement (SAB1 and SAB2) synthesised in laboratory at 1250 °C. HBC sets slowly (set point over 200 min), SAB1 and SAB2 are fast-setting cements (set point within 30 minutes). HBC blended with either SAB1 or SAB2 (70/30 on the weight basis) gives setting times inside of 60-80 minutes. The replacement of HBC by 30 wt.% of SAB2 improved mechanical strength, pore structure, absorption capacity and dynamic modulus of elasticity of the cured cement, while the combination with SAB1 showed decreased values of these parameters. The conduction calorimeter showed an expressive difference in the heat evolution curves of blended cements.


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