Properties of blended sulfoaluminate belite cement

摘要

The subject of the study was the possibility of the blending of sulfoaluminate belite (SAB) cement by means of various pozzolanas. The results obtained show that it was possible effectively to modify the properties of SAB cement by means of granulated blast furnace slag, fly ash, and silica fume, and the properties of materials based on these blends. Interesting properties from practical viewpoints of these materials was their compressive strength. As it is very well known, this is by the blending used to decrease. From a viewpoint of the acceptable compressive strength decrease, for SAB cement blends well-found portions of pozzolana with the values of approximately 5-15/100 seem to be optimal. This range was significantly lower than well-found portions of pozzolanas with values of approximately 20-40/100 for Ordinary Portland Cement (OPC) blends. The main cause was the fact that unique sources of calcium hydroxide needed for pozzolanic reaction in SAB was only p--C2S compared to OPC having two sources of calcium hydroxide -- the hydration of C_3S and β-C_2S. Therefore, the amount of calcium calydrokide for the pozzolanic reaction in the SAB cement blends was significantly lower. That was why the lower portions of pozzolanas in Sal_3 cement blends were suitable.