Abstract
Some researches have been conducted on the application of geopolymer in 3D printing. However, there is no publication about the high-temperature properties of 3D printed geopolymer made from fly ash, slag, and metakaolin. This paper presents the experimental research on the mechanical properties of 3D printed geopolymer after being exposed to elevated empratures. The effects of curing age on high-temperature properties are analyzed. The heating temperasures were 300 °C, 600 °C, and 900 °C, and the holding time was one hour. After exposure to temperatures, the flexural strength of 3D printed geopolymer exhibited different change trends with increasing curing age for different exposure temperatures. Before and after exposure to elevated temperature, the 3D printed geopolymer experienced significant anisotropic compressive strengths. The change trends of compressive strength at different exposure temperatures wit hincreasing curing ages were different from each other on different loading directions.
Highlights
The application of 3D printing technique in construction and building is attracting more and more attentions, and some researches and engineering projects have been conducted[1,2,3,4,5,6,7,8,9,10]
Nematollahi et al [17] found that only the compressive strength on perpendicular direction of additive manufactured fly ash-based geopolymer mortar can be improved by adding polypropylene fibres, and the flexural strength was improved due to the addition of fibres
Panda et al [10] investigated the influences of printing time gap between layers, nozzle speed and nozzle standoff distance on the tensile bond strength of 3D printed fly ash-slag-silica fume-based geopolymer, and found that the bond strength is influenced by materials strength development rate and printing parameters
Summary
The application of 3D printing technique in construction and building is attracting more and more attentions, and some researches and engineering projects have been conducted[1,2,3,4,5,6,7,8,9,10]. Previous studies on 3D printable/printed geopolymer mainly focused on the preparation, fresh properties, interlayer adhesive strength, and hardened properties at ambient temperature. The experimental results show that mechanical properties of 3D printed geopolymer exhibits anisotropic characters. Bong et al [11] optimised 3D printable geopolymer cured at ambient temperature by investigating the impacts of type of hydroxide solution, type of silicate solution, and the mass ratio of silicate solution to hydroxide solution on workability, extrudability, shape retention ability, and mechanical properties. Panda et al [19] investigated the fresh and hardened properties of 3D printed fly ash-slag-silica fume-based geopolymer, and found that silica fume significantly affected the fresh properties, and slag resulted in higher early strength. The mechanical properties of cementitious materials after high temperature exposure are important aspects of concern for application in the building and construction. This paper investigates the flexural and compressive strength of different loading directions after exposure to 300 °C , 600 °C, and 900 °C
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