摘要
Wet granulation is a potential method to develop artificial aggregates.In this paper,the granulation of recycled alkali-activated slag powders with different particle size(d_(50) ranging between 12.9-127.7μm)distributions were investigated in order to find how these affect on the engineering properties of the artificial aggregates.Blast furnace slag was added as co-binder in 10-30 wt.%during the granulation process and to enhance the properties,especially mechanical strength.The results show that the particle size of the raw material significantly affects the engineering properties of the produced aggregates,such as the crushing force(19-131.8 N),bulk density,water absorption,porosity and microstructure of the granules.The results show that granulation is a promising method to recycle alkali-activated materials as lightweight aggregates to replace natural aggregates.
湿法造粒是一种潜在的人造骨料制备方法。本文研究了不同粒径分布的再生碱激发矿渣粉(d_(50)介于12.9-127.7μm)对人造骨料性能的影响。此外,在造粒过程中掺入质量分数为10-30%的高炉矿渣作为辅助胶凝材料,以提高其性能,特别是力学强度。试验结果表明,原料粒径对制备的人造骨料的性能产生了显著影响,如压碎力(19-131.8N)、堆积密度、吸水率、孔隙率和微观结构等。因此,将回收的碱活性材料进行造粒成轻质骨料并替代天然骨料是一种很有前景的方法。
基金
support received for the project DeConcrete Eco-Efficient Arctic technologies cooperation funded by kolarctic CBC initiative of European Union(KO 4068).XRD analysis was performed at the Center of Microscopy and Nanotechnology(University of Oulu).The authors would like to thank Jarno Karvonen and Elisa Wirkkala for their assistance with the laboratory experiments.
