Ceramics-Silikáty 41, (1) 35 - 39 (1997)

The properties were studied of Portland and slag mixed cements containing admixtures of 5 to 30 wt.% of ground limestone (as replacement of cement) with a specific surface area of 400 to 900 m² kg⁻¹. The decrease in strength in terms of increasing limestone content indicates that the limestone does not take part in cement gel formation. However, it is theoretically possible to prepare, from slag cement SPC 325 and 10-12 wt.% ground limestone with a specific surface area of 550 m² kg⁻¹, a mixed cement exhibiting higher 2-day and 7-day strengths, and a 28-day strength reduced by max. 10 % (compared to the original SPC 325 cement).