Blended Kiln-dust Cements Dai Lilai Zhang ChuanhaiThis paper is deating with using the cement-kiln dust.The simplex grid method ofoptimum design is used to determine the most preferential mixture ratio in theKilndust-Clinker-Blastfurnace Slah-Fly Ash system.Moreover,a study of thestrength,setting time,soundness of this system has been performed.In addition,the effect ofsome liln-dust with different basicity on the behaviour of blended cement has been investi-gated.The kitn-dust was provided by several domestic cement plants.The hydrates of thissystem have been priliminaryly identified through Scanning Electron Microscope andX-ray diffraction analysis.Kiln dust;;Simplex grid method;;Blended cement.