Abstract
We have to use some by-products to concrete for the conservation of natural resources or the sustainable development of human society in these days. The slag fine aggregates are also included in this category. However, the concrete containing the slag fine aggregate has a tendency to show the lower fluidity or the higher amount of bleeding. The relatively higher density or more angular particle shape of the fine aggregate causes these phenomena. Therefore, It's very significant to improve the qualities of concrete made with slag fine aggregate for the real effective use of the fine aggregate.
In this study, we investigate the influence of the properties of slag fine aggregates on the qualities of concrete from fresh to hardened stage. First, we basically investigate the influence of particle shape or density of slag fine aggregates on the fluidity or the bleeding of mortar. Consequently, we evaluate the suitable finer materials content to improve the fluidity of mortar based on the fine aggregate particle shape, and the required plastic viscosity of the paste, obtained by the adjustment of water cement ratio or the finer materials content in fine aggregate to control the bleeding of mortar. Then, we investigate the effects of these adjustments based on the results of the basic study on the fluidity, the bleeding, the strength development and the uniformity of fresh or hardened concrete.
