Strength Development of Blended Blast Furnace Slag Cement Mortars


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Title: Strength Development of Blended Blast Furnace Slag Cement Mortars

Author(s): C. L. Hwang and C. Y. Lin

Publication: Special Publication

Volume: 91


Appears on pages(s): 1323-1340

Keywords: alkalies; batching; blast furnace slag; bleeding (concrete); cooling; diffusion; fineness; flash set; grinding (comminution); mixing; mortars (material); porosity; strength.

Date: 2/1/1986

Blast-furnace slags cooled at different rates were used to study the effect of fineness, mixing method and content of slag on the strength development of blended-slag mortar. Test results indicated that the strength development of air-cooled slag was better than expected, even though it was less effective than that of water quenched. When the intergrinding method was compared with the separate batching method, the latter needs a longer mixing time to reach a comparable quality. The slump and bleeding were reduced as the amount of slag increased at low water to cementitious mix ratio. Alkali activated the reaction of slag. However, excessive alkali might cause flash setting of the fresh mortar. The diffusion process seemed to govern the cementitious reaction of slag and which, in turn, tended to retard the hydra-tion of cement. Therefore, the optimum slag content depended upon the age of cement mortar.