EFFECT OF PARTICLE SIZE DISTRIBUTION ON THE RHEOLOGICAL PROPERTIES OF SLAG CEMENT PASTE

Abstract eng:
For high durability and strength, decreasing of the water to binder ratio of cement is needed by using of fly ash, blast furnace slag as mineral admixture. And it is pointed out that the rheological property of cement is improved by controlling of particle size distribution of blast furnace slag. In this study, we investigated the effect of particle size distribution on the rheological properties of the slag cement paste by using of coarse and fine blast furnace slag particles. And we also ran computer simulation to analyze the correlation between experimental results of rheological properties and packing fraction of slag cement. Furthermore, we investigated correlation with plastic viscosity on the basis of the existing particle size distribution function. The hysteresis area was smaller by adding of coarse blast furnace slag particles. When the combination was based on a ratio of 20~25 vol% fine particles, 30~40 vol% OPC and 40~45 vol% coarse particles, a high fluidity and low yield stress was achieved. The plastic viscosity rises, as the n-value increases. Almost all samples indicated that the n-value had a correlation with plastic viscosity. However, when the amount of fine particles was over 30 vol%, plastic viscosity decreased though the n-value decreased. We found out the mixing ratio of cement and blast furnace slag for better packing fraction and rheological properties.

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