Wednesday, May 22, 2019
3:30 pm - 4:30 pm
Track Name: AEC Next
Session Date: May 22 2019 3:30 pm - 4:30 pm
Session Credits: 1 LU
3:30pm - 3:50pm Incorporating BIM in 3D Printing of Concrete
3D printing of concrete (3DCP) is becoming a promising technology to build structures in the near future. 3DCP is a freeform concrete construction method that allows construction of various complex structures with many advantages over the conventional concrete construction. Because the process does not need formwork, it results in rapid manufacturing capability, and significantly reduced construction time and cost. Building Information Modeling (BIM) on the other hand is a capability that helps communication among various platforms required for building analysis, design, construction, and maintenance. This study presents the results of incorporating BIM in the 3DCP process. The context for the study is NASA 3D Printing Mars Habitat challenge where teams compete in developing 3D printing material, machinery, and process for 3D printing of habitats on Mars. Penn State team participated in Phase II and is currently engaged in Phase III to printing a scale model of the habitat. The design for a 93 m2 habitat on Mars surface should be able to support four astronauts for one year. The required penetrations on the walls of the facility and living, working, and other spaces needed for astronauts increases the difficulties in construction. Because of the complexity, the BIM model for the design is required to represent both the 3D and 4D information so that the model can show its structural and construction sequencing attributes. The project presented here utilizes a BIM model generated using Revit by AutoCAD to connect the habitat design with the printing process. Finite Element Analysis is performed by using Inventor by AutoCAD to check the structural integrity in the harsh environment on Mars. The geometric information of the habitat design is directly transferred from the BIM model to the analysis program that reduces the preparation time significantly. Since the structural components for the design are not ready-made products, the BIM model could not use the existing BIM library. The designed habitat includes cylindrical-shaped exterior walls to resist the air pressure from the inside, domed shape roof, the printing of which will be challenging without a supporting structure. Dynamo by AutoCAD which is a visual programming tool based on the Python script helps to generate the BIM model and the printing path from the model. Ideally, it is expected that a BIM model will include the whole process of printing from its preparation to monitoring so that the design considers the printing process from its start. Generating printing tool-path from the geometric information model in STL file form is the critical part in the general printing process chain. The most recent effort consists of trying to generate the tool-path from the BIM model automatically by considering both the structural behavior and static stability of printing material in the printing process at the same time. It is expected that this step will be an important step for autonomous construction process by using the 3DCP system. Finally, the standardized 3DCP concrete process to realize the building-scale structure integrated with BIM may be suggested by the result of this project.
3:50pm - 4:10pm Challenging Constructions with Additive Manufacturing
Decade, the diffusion of 3D printing has allowed architects and engineers to imagine and develop constructions that can be produced additively. However, questions about the convenience of using this technology, and whether additive large scale constructions can be feasible, efficient and sustainable are still open. In this research 3D Printing is considered not as a question, but as an answer to the increasing scarcity of material resources for constructions. This presentation shows the overarching process from concept to construction of a number of research projects at large scale entirely designed and optimized for 3D Printing, using Fused Deposition Modelling (FDM) - one of the most cost-effective additive techniques of production.
4:10pm - 4:30pm 3D Printing - Mortars for Tomorrow's Buildings
3D printing of cement is one integral step to bridging the gap between design and build in construction, stream lining the value chain and making complex designs easily achievable. I'd like to showcase what this process looks like, breaking it into the 3 basic components, hardware, software, and the medium ink (concrete) to show how new developments within the space will be impacting construction. Note, while yes i do work for Laticrete, a global mortar supplier, the emerging field of 3D printing, is in an early collaborative time, and the intent of the presentation is to engage the audience to want to participate so that we can bring in more areas of construction and expertise as we work to automate construction activities. Thus, the presentation would be a quick history overview of the technology and then share as much detail as possible (not protecting under NDA) to where the technology is being applied, put in context of potential areas for disruption. Also important is to stress that 3D printing incorporates in uses of many new construction technologies from scanning to sensors and being involved in its development provides excellent use cases for countless other new technologies, for example scanning structures that need repairs and then having the printer do the work.