Investigation of the rheology and strength of geopolymer mixtures for extrusion-based 3D printing

Abstract This study presents the development of fly ash-based geopolymer mixtures for 3D concrete printing. The influence of up to 10% ground granulated blast-furnace slag (GGBS) and silica fume (SF) inclusion within geopolymer blends cured under ambient conditions was investigated in terms of fresh and hardened properties. Evolution of yield stress and thixotropy of the mixtures at different resting times were evaluated. Mechanical performance of the 3D printed components was assessed via compressive strength measurements and compared with casted samples. SF demonstrated a significant influence on fresh properties (e.g. recovery of viscosity), whereas the use of GGBS led to higher early strength development within geopolymer systems. The feasibility of the 3D printing process, during which rheology was controlled, was evaluated by considering extrusion and shape retention parameters. The outcomes of this study led to the printing of a freeform 3D component, shedding light on the 3D printing of sustainable binder systems for various building components.

[1]  V. Rose,et al.  Evolution of binder structure in sodium silicate-activated slag-metakaolin blends , 2011 .

[2]  Ming Jen Tan,et al.  Fresh and hardened properties of 3D printable cementitious materials for building and construction , 2018 .

[3]  T. Salem.  Electrical conductivity and rheological properties of ordinary Portland cement-silica fume and calcium hydroxide-silica fume pastes , 2002 .

[4]  Nicolas Roussel,et al.  The origins of thixotropy of fresh cement pastes , 2012 .

[5]  Guowei Ma,et al.  Mechanical characterization of 3D printed anisotropic cementitious material by the electromechanical transducer , 2018, Smart Materials and Structures.

[6]  B. Panda,et al.  Measurement of tensile bond strength of 3D printed geopolymer mortar , 2018 .

[7]  Á. Palomo,et al.  Alkaline solution/binder ratio as a determining factor in the alkaline activation of aluminosilicates , 2012 .

[8]  Damien Rangeard,et al.  Structural built-up of cement-based materials used for 3D-printing extrusion techniques , 2016 .

[9]  K. Leong,et al.  3D Bioprinting of Highly Thixotropic Alginate/Methylcellulose Hydrogel with Strong Interface Bonding. , 2017, ACS applied materials & interfaces.

[10]  Paolo Colombo,et al.  Direct ink writing of geopolymeric inks , 2017 .

[11]  Kah Fai Leong,et al.  3D printing trends in building and construction industry: a review , 2017 .

[12]  Ming Jen Tan,et al.  Additive manufacturing of geopolymer for sustainable built environment , 2017 .

[13]  J. Cornell,et al.  Experiments with Mixtures , 1992 .

[14]  J. Sanjayan,et al.  Method of formulating geopolymer for 3D printing for construction applications , 2016 .

[15]  Ming Jen Tan,et al.  Experimental study on mix proportion and fresh properties of fly ash based geopolymer for 3D concrete printing , 2018, Ceramics International.

[16]  N. Shafiq,et al.  Effect of silica fume on the fresh and hardened properties of fly ash-based self-compacting geopolymer concrete , 2013, International Journal of Minerals, Metallurgy, and Materials.

[17]  Philippe Coussot,et al.  Steady state flow of cement suspensions: A micromechanical state of the art , 2010 .

[18]  T. T. Le,et al.  Mix design and fresh properties for high-performance printing concrete , 2012 .

[19]  A. Gibb,et al.  Hardened properties of high-performance printing concrete , 2012 .

[20]  C. Rajasekaran,et al.  Enhancement of the properties of fly ash based geopolymer paste by incorporating ground granulated blast furnace slag , 2017 .

[21]  Nicolas Roussel,et al.  A thixotropy model for fresh fluid concretes: Theory, validation and applications , 2006 .

[22]  Ammar Yahia,et al.  Field-oriented test methods to evaluate structural build-up at rest of flowable mortar and concrete , 2012 .

[23]  Kamal H. Khayat,et al.  Assessment of Thixotropy of Flowable and Self-Consolidating Concrete , 2003 .

[24]  Behrokh Khoshnevis,et al.  Construction by Contour Crafting using sulfur concrete with planetary applications , 2016 .

[25]  J. Temuujin,et al.  Influence of calcium compounds on the mechanical properties of fly ash geopolymer pastes. , 2009, Journal of hazardous materials.

[26]  Nicolas Roussel,et al.  Rheological requirements for printable concretes , 2018, Cement and Concrete Research.

[27]  David J. Corr,et al.  The thixotropic behavior of fresh cement asphalt emulsion paste , 2016 .

[28]  Ming Jen Tan,et al.  Anisotropic mechanical performance of 3D printed fiber reinforced sustainable construction material , 2017 .

[29]  Aurélie Favier,et al.  Flow properties of MK-based geopolymer pastes. A comparative study with standard Portland cement pastes. , 2014, Soft matter.

[30]  Lex Reiter,et al.  The role of early age structural build-up in digital fabrication with concrete , 2018, Cement and Concrete Research.

[31]  Behrokh Khoshnevis,et al.  Automated construction by contour craftingrelated robotics and information technologies , 2004 .