聚羧酸减水剂与高分散聚羧酸减水剂3D打印胶凝材料层间粘结性能研究
Interlayer bonding investigation of 3D printing cementitious materials with fluidity retaining polycarboxylate superplasticizer and high dispersion polycarboxylate superplasticizer
摘要：
对3D打印胶凝材料（3DPC）的流变性能和时变特性提出了特殊要求。采用高分散聚羧酸减水剂（HD PC）和保流聚羧酸减水剂（FR PC）对3DPC的流变性能进行控制。研究了时间间隔的相关性、流变性能的时变特性和层间结合强度。结果表明，阻燃聚碳酸酯能提高新拌水泥浆体的流动性保持能力和触变性。FR PC的触变性滞回圈面积和再絮凝率分别比HD PC高101.9%和80.4%。此外，FR PC聚合物对层间结合具有积极作用，并且可以减少由延长时间间隔引起的负面影响。在20 s ~ 30 min的时间间隔内，FR PC的层间结合强度下降了14.1%，而HD PC的层间结合强度下降了50.0%。
英文摘要：
Proposed special requirements exist for the rheological properties and time varying characteristics of 3D printing cementitious materials (3DPC). In this study, high dispersion polycarboxylate superplasticizer (HD PC) and fluidity retaining polycarboxylate superplasticizer (FR PC) were used to control the rheological behaviors of 3DPC. The correlation of the time interval, the time varying characteristics of the rheological properties and the interlayer bonding strength were investigated. The results indicated that FR PC improved the fluidity retention ability and thixotropy of the fresh pastes. The thixotropic hysteresis loop area and reflocculation rate (Rthix) of FR PC were 101.9% and 80.4% higher than those of HD PC, respectively. Furthermore, the FR PC polymer has a positive effect on the interlayer bonding and may reduce the negative effect caused by extending the time interval. During the time interval of 20 s to 30 min, the interlayer bonding strength with FR PC decreases by 14.1%, while that with HD PC decreases by 50.0%.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
