摘要
针对3D打印混凝土(3DPC)技术,探讨了稻草纤维直径、胶砂比和减水剂掺量对3D打印稻草纤维水泥基复合材料(3DPRSFCC)流动度、可挤出性、可建造性和力学性能的影响。结果表明:3DPRSFCC的流动度随纤维直径的增大而明显减小,随胶砂比和减水剂掺量增加而增大;当纤维直径为0.6 mm(长度3~5 mm)、胶砂比为1∶1、减水剂掺量为0.10%时,3DPRSFCC的可挤出性、可建造性和力学性能最优。在此配合比下,打印条带宽度变异系数较小,且能实现10层空心圆柱结构的稳定打印,结构累计形变率为31.5%,试件28 d抗折、抗压强度分别达3.21、5.20 MPa。为稻草秸秆资源化利用和稻草纤维在3DPC中的应用提供参考。
This study investigates the effects of rice-straw fiber diameter,sand-to-binder ratio(S/B)and superplasticizer dosage on the flowability,extrudability,buildability and mechanical performance of 3D printing rice straw fiber reinforced cement-based composites(3DPRSFCC).Results show that flowability decreases markedly with increasing fiber diameter,whereas it improves with higher S/B and superplasticizer content.An optimal balance is achieved with 0.6 mm-diameter fibers(3~5 mm long),S/B=1∶1 and 0.10%superplasticizer:under this mix the composite exhibits the best extrudability,buildability and mechanical properties,a low coefficient of variation in printed filament width,and enables stable construction of a 10-layer hollow cylinder with a cumulative deformation of only 31.5%.The corresponding 28-day flexural and compressive strengths reach 3.21 MPa and 5.20 MPa,respectively.The work provides reference for valorizing rice straw and for deploying rice straw fibers in 3D concrete printing.
作者
姜德民
胡思雨
康红龙
黄鸿嘉
牛国行
JIANG Demin;HU Siyu;KANG Honglong;HUANG Hongjia;NIU Guohang(Faculty of Civil Engineering,North China University of Technology,Beijing 100144,China;Beijing Urban Construction Group Co.Ltd,Beijing 100088,China)
出处
《新型建筑材料》
2026年第1期48-52,共5页
New Building Materials
基金
北京市自然科学基金项目(2172021)。
关键词
3D打印
稻草纤维
水泥基材料
可打印性
可建造性
3D printing
rice straw fiber
cement-based materials
printability
buildability
