Effect of Clinker Phase Changes on Cement Performance and Its Reactivity with Super Plasticizer Additive

Document Type : Original Article

Authors

1 Chief of research and development of Tehran cement Co, Tehran, Iran.

2 Assistant Professor of Road, Housing and Urban Development Research Centre, Tehran, Iran.

3 Chief of physical Laboratory of Tehran cement Co, Tehran, Iran

4 Expert of Laboratory of Tehran cement Co, Tehran, Iran.

Abstract

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 11 samples were selected whose phase values were varied. Then laboratory cement was performed under the same conditions using 11 clinker samples, and physical and chemical analysis of cement samples was performed. So 22mixtures were prepared so that 11mixtures with the title of control and 11mixtures with the title of additives. Based on the results, comparing the effect of C3S clinker on the compressive strength of standard mortar and concrete showed that there is no direct correlation between C3S and compressive strength, but it can be said that with each percentage increase of C3S clinker, about 1.5 unit (kg/cm2). However, with the increase of C3S from about 57% onwards, the decrease in concrete strength is clearly seen, which can be referred to as the negative effect of excessive C3S 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 C3A is about 5-6%.

Keywords

Main Subjects


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Volume 5, Issue 4
December 2021
Pages 211-221
  • Receive Date: 04 September 2021
  • Revise Date: 01 October 2021
  • Accept Date: 28 October 2021
  • First Publish Date: 20 December 2021