The manufacturing process of pig iron generates large amounts of slag. The slow cooling of this waste generates the air-cooled blast furnace slag (ACS). Since it is less reactive than granulated blast furnace slag (GBFS), ACS finds little use as supplementary cementitious material (SCM) and the existing studies use it only as aggregates in concrete. This work investigated the use of finely ground ACS as SCM for self-compacting concrete (SCC) production. Pastes and SCCs with GBFS, ACS in two grinding levels and limestone filler (LF) were produced, and their fresh state performance, hydration kinetics and compressive strength from 3 to 91 days were evaluated. ACS increased the yield stress and viscosity of the pastes compared with LF, also increasing the SCC’s superplasticizer content required to reach the target slump flow of 650 ± 50 mm. Nonetheless, this increase was from 0.95 up to 1.36 kg/m³ of concrete, and all the mixes presented V-funnel time of 4–6 s and were highly stable in the fresh state (VSI = 0, with no segregation/bleeding). Isothermal calorimetry indicated that ACS slightly shortened the induction period compared with LF, but led to equivalent peak values (6.7–6.9 mW/g cement). Concretes with ACS and LF had similar strengths at all ages, reaching 32 ± 1 MPa at 3 days and 41 ± 2 MPa at 91 days, indicating that no significant reaction was observed for ACS up to the later age. Furthermore, blending ACS with LF in equal proportions resulted in a SCC with fresh performance equivalent to that containing only LF, in addition to increasing the strength by about 5% at all ages. In general, ACS had comparable performance to that of LF and can be used as SCM in SCC.

生铁的制造过程会产生大量的炉渣。废物的缓慢冷却会产生风冷的高炉矿渣（ACS）。由于它的活性不如粒状高炉矿渣（GBFS），因此ACS几乎没有将其用作补充胶凝材料（SCM），并且现有研究仅将其用作混凝土中的骨料。这项工作研究了将细磨的ACS作为SCM用于自密实混凝土（SCC）生产的方法。制备了具有两个研磨级别的GBFS，ACS和石灰石填料（LF）的糊剂和SCC，并评估了它们在3到91天的新鲜状态性能，水合动力学和抗压强度。与LF相比，ACS增加了糊的屈服应力和粘度，也增加了SCC的超塑化剂含量，以达到650±50 mm的目标坍落度。³的混凝土，所有混合料的V漏斗时间为4-6 s，并且在新鲜状态下高度稳定（VSI = 0，无偏析/渗出）。等温量热法表明，与LF相比，ACS略微缩短了诱导期，但导致了等效峰值（6.7-6.9 mW / g水泥）。具有ACS和LF的混凝土在所有年龄段都有相似的强度，在3天时达到32±1 MPa，在91天时达到41±2 MPa，这表明直到更高年龄的ACS都没有观察到明显的反应。此外，将ACS与LF等比例混合后，SCC的新鲜性能与仅含LF的SCC相当，此外，所有年龄段的强度均提高了5％。通常，ACS具有与LF相当的性能，可以在SCC中用作SCM。