Abstract
Concrete with low porosity/permeability is one of the activities within project 1 “Advanced cementing materials and admixtures” in the Norwegian centre for research driven innovation COIN (Concrete Innovation). The objective is to make concrete with low porosity and permeability, but focused on matrix. Two state-of-the-art reports (STARs) were scheduled for 2007 on different approaches to achieve the objective; 1) “low porosity through particle packing” dealing with obvious systems like adding fine particles (e.g. silica fume) to more advanced systems focusing on avoidance of initial Ettringite formation functioning as spacers hampering packing of cement grains in the fresh state and 2) “Low permeability through hydrophobicity” dealing with hydrophobizing agents intermixed in the concrete and not applied on the surface of hardened concrete.