Pyroprocessing and cooling conditions leave certain imprints on the clinker Micro-structure and its chemico-mineralogical composition . These characteristics serve as a diagnostic tool for optimisation of processing conditions of clinker to achieve effective control on the quality of clinker .
This paper discusses two specific case studies where the clinker /cement was affected by reducing conditions of burning .In one case the cement resulted in showing high autoclave expansion where as in second case , the cement was yellowish grey in colour .
Chemico-Mineralogical and Microstructural charaterisation , including SEM studies were carried out to trace the formation of alkali aluminates and di calcium ferrites and to identify the crystallographic / morphological modifications produced in the silicate phases due to reducing burning conditions . The paper attempts to correlate these characristics with the observed quality problems in the two cases .
Based on these studies , certain remedial measures were recommened and implemented in the Plants which led to oversoing the problems in the quality of cement in the two cases and the same is highlighted in this paper
This paper was published in “World Cement “ August 1995 issue