JAUE2024-056: Study on Rheological Properties of 3D Printed Fiber Reinforced Modified Fly Ash based Geopolymer

Abstract

The lack of aggregate in 3D printed geopolymers leads to poor mechanical properties and high risk of cracking in the printed components. Adding a certain amount of fiber to the mixture is an important measure to inhibit shrinkage and cracking of 3D printed geopolymers and improve their mechanical properties. In this paper, modified low carbon fly ash was obtained by utilizing waste fried oil flotation of industrial solid waste fly ash, and modified fly ash based geopolymer was prepared by using silica fume and GGBS as supplementary cementitious materials. The effects of different lengths and amounts of polypropylene fibers on the rheological properties of geopolymers were investigated. The results showed that the yield stress of geopolymer increased linearly with the increase of polypropylene fiber content, while the flow decreased linearly. The increase of fiber content decreased the printability of the modified fly ash geopolymer. Moreover, there is a strong correlation between the yield stress and the fluidity of the modified fly ash geopolymer.