Path Optimization in 3D Concrete Printing to Minimize Weak Bonds Formation

  • Fatima AlSakka Department of Civil Engineering, Faculty of Engineering and Architecture, American University of Beirut, P.O. Box 11-0236, Riad El-Solh, Beirut 1107 2020, Lebanon
  • Mohammad Hasan Senan Department of Civil Engineering, Faculty of Engineering and Architecture, American University of Beirut, P.O. Box 11-0236, Riad El-Solh, Beirut 1107 2020, Lebanon
  • Abdallah Abou Yassin Department of Civil Engineering, Faculty of Engineering and Architecture, American University of Beirut, P.O. Box 11-0236, Riad El-Solh, Beirut 1107 2020, Lebanon
  • Farook Hamzeh Department of Civil Engineering, Faculty of Engineering and Architecture, American University of Beirut, P.O. Box 11-0236, Riad El-Solh, Beirut 1107 2020, Lebanon

Abstract

3D concrete printing has proven to be a highly favorable construction method in terms of time reduction, cost optimization, architectural flexibility, sustainability, energy use, and others. However, the quality of the final product certainly has a priority over all of these attractive features of the technology. Yet research has given little consideration to investigating the structural integrity of 3D printed concrete structures. Research states that printed structures exhibit sufficient strength as compared to traditionally built structures. Nevertheless, the fact that this strength is sensitive to numerous factors including the machine setup, the printing process, existing conditions (e. g. temperature) and others, should be studied. A major determinant of the reliability and quality of printed structures is the adhesion level between subsequent layers. Poorly adhered concrete surfaces result in weak bonds that in turn reduce rupture strength. The time elapsed between printing successive concrete layers should be bounded to ensure that concrete is flowable enough to adhere to previous layers. For a given concrete mixture design, this time is a function of travel distance and speed. Thus, this research aims at finding the optimum printing path that minimizes the formation of weak bonds without compromising buildability for a given structure and a defined speed. The research employs Discrete Event Simulation to model the printing process for numerous possible travel paths and assess their adequacy by comparing travel time to allowable time limits.

Keywords: 3D concrete printing, delay time, DES, path optimization, weak bonds
Published online
2019-09-23
How to Cite
AlSakka, F., Hasan Senan, M., Abou Yassin, A. and Hamzeh, F. “Path Optimization in 3D Concrete Printing to Minimize Weak Bonds Formation”, Periodica Polytechnica Architecture. doi: https://doi.org/10.3311/PPar.12722.
Section
Articles