Abstract: The present invention relates to composite binders containing calcium sulfoaluminate cement and supplementary cementitious material, wherein a weight ratio of calcium sulfate to the sum of ye'elimite, aluminates and ferrites (R$/(Y+A+F)) ranges from 0.5 to 0.85, to a method of manufacturing them comprising the steps: a) providing at least one calcium sulfoaluminate cement b) providing at least one supplementary cementitious material c) mixing 10 to 90% by weight calcium sulfoaluminate cement(s) with 10 to 90% by weight supplementary cementitious material(s), and to their use for making hydraulically setting building materials and special construction chemical compositions.

Abstract: The present invention relates to a binder comprising calcium sulfoaluminate (CSA) cement and a magnesium compound, to a method of enhancing strength development and/or increasing compressive strength of building structures from CSA binders and to the use of magnesium compounds as additives for increasing compressive strength of hydrated CSA binders.