ABSTRACT
9.1 Introduction Blast furnace slag, phosphorus slag, coal fly ashes, natural pozzolans and silica fume are widely used for the production of blended cement or as a cement replacement in concrete. The use of these materials usually increases setting time and decreases early strengths of the cement and concrete. Many researches have indicated that the addition of alkaline activators can activate potential pozzolanic or cementitious properties of those materials, especially at early ages. This chapter discusses the alkaline activation of portland cement-based blended cements.
