3D打印粗骨料混凝土的研究进展及应用

Research progress and application of 3D printed coarse aggregate concrete

混凝土3D打印近年来备受瞩目,3D打印混凝土也迅速发展,但目前大多数的3D打印的混合料中只有细集料,最大尺寸仅为4 mm。由于混合料中缺少粗骨料,水泥成分较多,导致混凝土成本增加,减少了固废利用,资源消耗多,造成了巨大的环境负担。3D打印粗骨料混凝土不仅减少了水泥用量和碳排放、降低施工成本,还可以回收建筑固体废物。此外增加粗骨料的掺量还可以使混凝土的水化热收缩明显降低,体积稳定性提高。分析粗骨料掺入对其可打印性、流变性、可挤出性、可建造性、力学各向异性及耐久性的影响,介绍了3D打印粗骨料的建造应用。

3D printed concrete has attracted much attention in recent years,and 3D printed concrete has also developed rapidly.However,currently,most 3D printed mixtures only have fine aggregates,with a maximum size of only 4mm.Due to the lack of coarse aggregate and high cement content in the mixture,the cost of concrete increases,reducing the utilization of solid waste,and resulting in high resource consumption,resulting in a huge environmental burden.3D printing of coarse aggregate concrete not only reduces cement consumption and carbon emissions,reduces construction costs,but also recycles solid waste from construction.In addition,increasing the amount of coarse aggregate can also significantly reduce the hydration heat shrinkage of concrete and improve its volume stability.It analyzes the effects of adding coarse aggregate on its printability,rheological properties,extrudability,constructability,mechanical anisotropy,durability introduces the construction application of 3D printed coarse aggregate.