Today’s requirements for concrete are focusing on increase of sustainability and workability. A way to address those aspects is the used of admixtures. Admixtures are used to accelerate the concrete reactions, to reduce water and cement amount needed and overall to reduce effort to actually produce the concrete. A typical admixture used to accelerate concrete is calcium nitrate which has been investigated over many years. A typical group of highly water reducing and plasticizing admixtures are polycarboxylate ether, which have been investigated plenty as well. However there has hardly been an investigation on their interaction. In this study an attempt is made to describe interactions of calcium nitrate and polycarboxylate ether briefly.