Ali Akbar Kafash Bazari - Chief of research and development of Tehran cement Co, Tehran, Iran.
Mehdi Chini - Assistant Professor of Road, Housing and Urban Development Research Centre, Tehran, Iran.
Zivar Nikfal - Chief of physical Laboratory of Tehran cement Co, Tehran, Iran
Mohamad Vatani - Expert of Laboratory of Tehran cement Co, Tehran, Iran.

Based on various sources and experiences, the main phases of clinker significantly impact the technical characteristics of cement and its performance in the resulting concrete. The interaction of clinker phases with concrete admixtures is also obvious, but the effect of each phase and their optimal values for optimal concrete performance is complicated. Therefore, in this study, this issue was an extensive laboratory operation was designed. So ۱۱ samples were selected whose phase values were varied. Then laboratory cement was performed under the same conditions using ۱۱ clinker samples, and physical and chemical analysis of cement samples was performed. So ۲۲mixtures were prepared so that ۱۱mixtures with the title of control and ۱۱mixtures with the title of additives. Based on the results, comparing the effect of C۳S clinker on the compressive strength of standard mortar and concrete showed that there is no direct correlation between C۳S and compressive strength, but it can be said that with each percentage increase of C۳S clinker, about ۱.۵ unit (kg/cm۲). However, with the increase of C۳S from about ۵۷% onwards, the decrease in concrete strength is clearly seen, which can be referred to as the negative effect of excessive C۳S phase (due to the solubility of concrete and increasing the w/c ratio). Based on the results of air determination experiments of fresh concrete mixtures containing additives and its declining trend in this study, it was found that the optimal value of C۳A is about ۵-۶%.

Alite, Aluminate, Additive