Influence of mineral additives on the hydration characteristics of ordinary Portland cement

摘要

The effect of mineral additives such as fly ash, slags,limestone, and lime sludge on the hydration of ordinary Portlandcement (OPC) has been studied. The samples of OPC with 10 wt%mineral additives were examined separately at 28 and 90 days ofhydration by X-ray diffraction and differential thermal analysis.The hydration products in the OPC + slags and OPC + fly ashsystems were found to be almost similar to that of pure OPC,except with the low quantity of Ca(OH)2 during the early period ofhydration (28 days). In the case of limestone and lime sludgeaddition, besides normal hydration phases of OPC, larger amountof Ca(OH)2 and a little calcium carboaluminate hydrates wereidentified by X-ray diffraction and differential thermal analysis patterns.