Details

Autor(en) / Beteiligte

• Chen, Mingxu
• Li, Laibo
• Zheng, Yan
• Zhao, Piqi
• Lu, Lingchao
• Cheng, Xin

Titel

Rheological and mechanical properties of admixtures modified 3D printing sulphoaluminate cementitious materials

Ist Teil von

• Construction & building materials, 2018-11, Vol.189, p.601-611

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2018

Link zum Volltext

Quelle

Elsevier ScienceDirect Journals Complete

Beschreibungen/Notizen

• •Rheological behaviors of 3D printing cementitious materials were investigated.•RSM was adopted to clarify the effect of hybrid admixtures in 3D printing paste.•The control range of viscosity and yield stress for 3D printing was first suggested. 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.