Study on Sintering Technology and Performance of Alite-Rich Cement Modified by C1.5Sr2.5A3S Mineral
The effects of the sintering temperature, sintering time and contents of calcium strontium suphoaluminate (C1.5Sr2.5A3) on the sintering technology of the alite-rich cement clinker modified by C1.5Sr2.5A3 were researched by the orthogonal test method. X-ray diffraction, scanning electron microscope-energy dispersive spectroscopy (SEM-EDS) and lithofacies analysis were used to investigate the compositions and structure of cement. The experimental results show that the optimal sintering temperature and sintering time of alite-rich cement clinker modified by C1.5Sr2.5A3 are 1350 °C and 60 min, and the appropriate content of C1.5Sr2.5A3 in the clinker is 2%. The introduction of C1.5Sr2.5A3 in clinker can promote the formation of alite mineral at low temperature and decrease the sintering temperature of clinker by 100°C approximately. This new-type cement shows excellent mechanics properties. The compressive strength at 3d is up to 64.3MPa, which is increased by 26.7% comparing to that of alite-rich cement and the compressive strength at 28d is almost the same as that of alite-rich cement. For alite-rich cement clinker modified by C1.5Sr2.5A3 calcinated at low temperature, alite still can be mass-formed, but the size decreases.
Shiquan Liu and Min Zuo
G. Q. Li et al., "Study on Sintering Technology and Performance of Alite-Rich Cement Modified by C1.5Sr2.5A3S Mineral", Advanced Materials Research, Vols. 306-307, pp. 970-974, 2011