Application / Use: Typical applications - general smaller concreting jobs like: Footpaths Slabs Footings Garden edges etc. Where a more structural concrete is required you may need to add neat cement to the premixed bag. As a guide, an addition of 1 kg to 1.5 kg per 20 kg bag of Blue Circle® GP can be used to achieve around 32 MPa concrete (under normal conditions). Concrete Mix Data Sheet