3D PRINTING OF FIBRE CEMENT-BASED MATERIALS: FRESH AND RHEOLOGICAL PERFORMANCES

Author(s): M. Rubio, M. Sonebi, S. Amziane
Paper category: Proceedings
Book title: Proceedings of the 2nd International Conference
on Bio-Based Building Materials
Editor(s): Sofiane AMZIANE, Mohammed SONEBI and Karine CHARLET
ISBN:
e-ISBN: 978-2-35158-192-6
Publisher: RILEM Publications SARL
Publication year: 2017
Pages: 491-499
Total Pages: 9
Language : English

Abstract: The aim of this paper is to investigate the effect of different mix composition on fresh and
rheological properties of a printable mortar. For the mix design, two binders such as fly ash
(FA), and silica fume (SF) were used with cement and sand for a water/binder ratio of 0.50.
Polypropylene fibres (PP), superplasticizer (SP), and viscosity modifying agents VMA (Diutan
gun and nano-clay) were used in the investigation. The results show that adding 24% of fly ash
and 8% Silica fume increased the yield stress, cohesiveness, and improved the structure
homogeneity and stability which appeared to be an advantage to print layers. Indeed it reduced
the fluidity, bleeding and the blockage of layers. Additionally, it also improved the passing ability
through the extruder and showed a greater resistance to penetration. The addition polypropylene
fibres (0.2% to 0.6%) led to a higher yield stress, and cohesiveness of the mix. This is led to a
stable mortar and kept the shape of layer under its own weight and sustained weight of
successive layers. The incorporation of PP fibres reduced the time gap. Furthermore, high
dosage of fibres can create more difficulties to extrude layers and led more drainage
phenomenon which increased the stiffening of the mix. PP fibres might be efficient to print
layers due to their small length and diameter which resulted in a dense and efficient network.
VMAs cause an important loss of workability and time gap which influenced the passing ability of
the mix through the extruder. However a high dosage of SP increased also bleeding and
segregation and may affect the stability and shape of the printable layers. Good correlations
existed between slump flow results, penetration results and also yield stress.

Online publication :2017
Publication type :full_text
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