To Design Extrusion Mechanism and Mix for 3D Concrete Printing

Additive Manufacturing AM or 3D concrete printing 3DCP is a state of art method where layer by layer structural members are rapidly constructed with automatic machine control and that commit to be notable benefits in the field of construction in terms of design flexibility, Diminished construction cost, time, manpower and construction waste. So 3DCP has vital importance to overcome the housing crisis in many regions and reduced pollution due to construction activities. In this study, an effort has been made to modify FDM based 3D printer into a 3D concrete printing by the modification of the extrusion mechanism. Most of the equipment's which are used in modifying the printer are 3D printed. 3D concrete printed components are generally less dense and porous so grey micro silica fume is added in the cement as a micro filling material along with fly ash for the extrusion of a mix. Conventional mortar or concrete is not feasible material for printing, due to several issues i.e. printer's nozzle blocked by aggregate, naturally so called brittle nature of concrete attributes relatively low tensile strength thus at risk of cracking, a problem occurs in compaction and layer by layer issues during placement, These issues overcome by insertion of micro materials into the matrix of cement. Micro materials such micro silica fume have ultra fine particles in approximately 100 thousand particles per cement will fill the water gaps with fresh mortar. This micro filling effect significantly reduces penetration and improves the binding of mortar compared to conventional mortar. Silica fume responds quickly to provide high initial strength and durability. The efficiency of the silica fume is 3 5 times the OPC and as a result, the performance of the concrete or mortar can be greatly improved. It's expected that the study of this topic may be a milestone for the blueprint of bigger scale projects in the future. Antariksh Joshi | Dr. A. K. Jha | Dr. R. S. Parihar "To Design Extrusion Mechanism and Mix for 3D Concrete Printing" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-6 | Issue-5 , August 2022, URL: https://www.ijtsrd.com/papers/ijtsrd51767.pdf Paper URL: https://www.ijtsrd.com/engineering/civil-engineering/51767/to-design-extrusion-mechanism-and-mix-for-3d-concrete-printing/antariksh-joshi