The reduction of greenhouse gases emission is the main issue the cement industry is facing now and will be facing in the near fixture. In the light of this, the use of the so-called secondary cementitous materials is mandatory for all modern cements. Among other types of mineral additions, fly ashes represent one of the most promising, due to availability and hydraulic behavior. In this paper we discuss the reactivity of several fly ash sources in a typical blended cement system, with particular reference to chemical additive used as performance enhancer. Physico-mechanical parameters such as compressive strengths and physico-chemical measurement are discussed and commented, with the aid of microscopy techniques for microstructure evaluation.
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