Abstract
The particle size distributions of the mixture of fly ash, slag and cement were studied. The micro gradation of the mixture of fly ash and slag, also named as Ultra Fly ash and Slag (UFS), was analyzed and optimized. The properties of cement mortar containing fly ash, slag and UFS were studied through laboratory tests. The hydration of UFS when adding the activator was also analyzed. Test results indicated that best ratio of fly ash to slag was 4:1, which would achieve the best filling effect, much better micro gradation and the highest density for UFS, and thus improve the early strength. Both the early and late stage strength of cement mortar containing fly ash was lower than those of the cement mortar containing slag or UFS. At the environment provided by the activator, the strength performance of cement mortar would be highly improved because of the secondary hydration of the cementitious material due to the water reducing and densifying effect of the UFS.
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