General Purpose Concrete Cemrok GP Concrete is a pre blended general purpose concrete that is quick and easy to use on a wide range of building projects. Cembed Designed to be used to bed pre-cast concrete wall segment panels in building construction. Cempack D4 Specifically designed to pack and fill the holes made for he bolting sockets and supporting equipment when assembling pre-cast concrete sections, panels and structures. CemThix Installation Grout CemThix is used to grout vertical and horizontal joints between linked precast wall segments and to infill gaps between and beneath precast wall segments providing structural support. Postfix Specially designed and formulated to produce a high quality concrete for securing any type of post.