Fundamental Study on Applicability of Blast Furnace Slag Fine Aggregate to Alkali Activated Material Mortar

In this study, as a fundamental study of alkali activated material mortar using blast furnace slag fine aggregate, evaluation of fresh properties were carried out. The compressive strength and drying shrinkage after hardening were measured. As a result, in the case of using blast furnace slag fine aggregate, when the mixing volume ratio of fly ash and ground granulated blast furnace slag was 60: 40, the setting time was ensured, and sufficient workability was obtained. And, by using both ground granulated blast furnace slag and blast furnace slag fine aggregate, the alkali activated material can be increased in strength over 90 MPa, and the drying shrinkage can be reduced by 25 % compared with the case where blast furnace slag fine aggregate is not used. In addition, the drying shrinkage of alkali activated material can be reduced by using expansive additive and shrinkage reducing additive, and the expansion effect is equivalent to the general mixing quantity to concrete using Portland cement as a binder. © 2022 The Society of Materials Science, Japan