Ph.D. position on Investigation and Modeling of Mechanical Bond Behavior and Composite Action between 3D Printed Concrete and Cast Concrete

Materials science and technology are our passion. With our cutting-edge research, Empa's around 1,100 employees make essential contributions to the well-being of society for a future worth living. Empa is a research institution of the ETH Domain.

Our

Structural Engineering Research Laboratory

developed new materials, systems, and manufacturing techniques for civil infrastructure use. It is one of Europe's biggest and most up-to-date structural laboratories, equipped with excellent testing facilities required for large-scale experiments. Some of its research endeavors to resolve open issues/questions related to 3D concrete printing. The primary goal is to develop innovative and attractive solutions for the problems hindering the wide-scale adoption of digital fabrication methods in the construction industry. 

ETH Zurich is one of the world's leading universities specializing in science and technology. It is renowned for its excellent education, cutting-edge fundamental research, and direct transfer of new knowledge into society. This PhD position is offered within the

Chair of Structural Mechanics

led by Prof. Eleni Chatzi at ETH Zurich in collaboration with Prof. Eduardo Julio from University of Lisbon, Prof. Sven Klinkel from RWTH Aachen University and Empa.

Project description and tasks

This PhD position is offered as part of an

SNSF-funded project

investigating low-damage 3D printed concrete walls reinforced with iron-based shape memory alloys (Fe-SMAs). The PhD project aims to develop a nonlinear finite element modeling framework to simulate the mechanical bond behavior between 3D printed concrete and cast concrete. To inform the model, small-scale experimental investigations - including direct shear, slant shear, and direct tension tests - will be conducted to characterize the bond. A particular focus will be on understanding how differential stiffness between the two concretes and interface waviness influence bond behavior. Building on the insights at small-scale level, the research will extend to the structural scale, examining the composite action between 3D printed concrete and cast concrete infill under axial compression. This will be achieved through a combination of finite element modeling and experimental testing of composite wall panels under axial compression. 

The planned tasks for PhD are as follows: 

• Formulation of a numerical modeling framework to model interlayer and interfacial bond behavior 
• Modeling of interlayer and interfacial bond behavior at the local-level using prism specimens 
• Modeling of composite action at the global level of a wall panel 
• Experimental investigation of the mechanical bond behavior of the hardened interface between 3D printed concrete and cast concrete 
• Experimental investigation of composite action of 3D printed concrete and cast concrete under axial compression in 3DPC wall panels 
• Analytical modeling of the composite action of 3DPC and cast concrete under axial compression in 3DPC wall panels

Your profile and selection criteria

The candidate should have a Master's degree in Structural Engineering (or related engineering) with a strong background in nonlinear finite element modeling, structural mechanics, and concrete structures. Experience or interest in 3D concrete printing is also important. Additional skills, including experience in small and large-scale experimental investigations and knowledge of shape memory alloys, would be an advantage. 

A strong desire and motivation to find cutting-edge and innovative solutions in the field of structural engineering are essential. The candidate should have a clear interest in working in an application-oriented research environment in close collaboration with our industrial and academic partners. Good knowledge of English (oral and written) is mandatory. Knowledge of German would be an advantage.

Our offer

We offer a multifaceted, challenging, and fully funded Ph.D. position for 48 months in a modern research environment with excellent infrastructure supported by regular supervision. The position is available as soon as possible but should be filled by no later than November 1, 2025.

We live a culture of inclusion and respect. We welcome all people who are interested in innovative, sustainable and meaningful activities - that's what counts.

PatriciaNitzsche, Stv. Leiterin Human Resources / Dep. Head Human Resources