同济大学学报（自然科学版）2024，Vol.52Issue(3)：370-377,8.DOI:10.11908/j.issn.0253-374x.22284
3D打印全再生粗骨料混凝土各向异性力学性能研究
Study on Anisotropic Mechanical Properties of 3D Printed Concrete with Full Recycled Coarse Aggregate
摘要
Abstract
Nature coarse aggregate(NCA)and recycled coarse aggregate(RCA)concrete were prepared using coarse aggregates with particle sizes ranged from 4.75mm-10 mm,and their printability as a 3D printing ink was comparatively evaluated.The effects of different curing conditions on the anisotropic mechanical properties of 3D printed concrete after hardening were also explored.The experimental results show that compared with NCA,the full replacement of RCA can accelerate the loss of workability of the printing ink.Through the scientific regulation of the mix ratio,the printable ink can still maintain printability after 10 min of resting,which can be increased to 20 min under continuous printing.Compared to standard curing,the 7d strength loss of natural and recycled specimens under natural curing is 19.84%and 20.13%,respectively.The relationship between the anisotropic compressive strengths was X-axis(print direction)>Z-axis(stacking direction)>Y-axis(drive shaft direction,vertical X-axis).The Y-axis compressive strengths of the natural and recycled printed specimens were 83.41%and 84.27%of the X-axis,showed significant anisotropy at 28d of standard curing.Finally,the formation mechanism of anisotropy by aggregate type and 3D printing interlayer properties was elucidated from the micro viewpoint.关键词
3D打印混凝土/全再生粗骨料/可打印性/各向异性/养护条件Key words
3D printing/full recycled coarse aggregates/printability/anisotropic/maintenance conditions分类
建筑与水利引用本文复制引用
段珍华,吕振源,肖建庄,李垒,刘春..3D打印全再生粗骨料混凝土各向异性力学性能研究[J].同济大学学报（自然科学版）,2024,52(3):370-377,8.基金项目
国家自然科学基金(52178244,52078358) （52178244,52078358）
