流变学
材料科学
胶凝的
复合材料
3D打印
挤压
水泥
粘度
甲基纤维素
纤维素
化学工程
工程类
作者
Mingxu Chen,Laibo Li,Yan Zheng,Piqi Zhao,Lingchao Lu,Xin Cheng
标识
DOI:10.1016/j.conbuildmat.2018.09.037
摘要
3D printing for cement-based material is recently supposed to be the rapidly and innovative forming technology in the building industry. This paper is concentrated on the rheological and mechanical properties of hydroxypropyl methyl cellulose (HPMC), water-reducing agent (WRA) and lithium carbonate (Li2CO3) modified 3D printing sulphoaluminate cementitious materials based on the extrusion system of 3D printing. Experimental results show that HPMC notably increases the stress and viscosity of cement paste and the plastic viscosity need to reach 1.650 ∼ 2.538 Pa·s for the build-up of 3D structures. While the cement paste with WRA and Li2CO3 present low shear stress and apparent viscosity. Furthermore, the setting time and rheological properties of 3D printing cement paste with hybrid admixtures are investigated using response surface methodology (RSM). The optimal hybrid additions of admixtures enable the 3D printing paste to achieve a favorable deformation rate and higher compressive strength. In conclusion, utilization of admixtures has a great potential to develop 3D printing sulphoaluminate cementitious materials used in buildings, which can effectively control the printable properties and rheological behaviors.
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