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Nicolas Ducoulombier

Nicolas Ducoulombier
XtreeE · R&D

Doctor of Engineering

About

17
Publications
5,417
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117
Citations
Introduction
Inline rheological measurement for extrusion-based additive manufacturing, developpement of reinforcement processes for additive manufacturing, mechanical characterisation of large scale 3D printed structures and evolution through time.

Publications

Publications (17)
Article
Full-text available
We focus in this paper on the embodied and operational contribution to climate change of a concrete-printing robotic cell. We first propose, in the case of extrusion-based additive manufacturing, a simple functional unit that relates a volume-based material impact and a time-based process impact through the printing head velocity and the filament c...
Chapter
The issue of reinforcement for 3D concrete printing has received considerable attention, as constructions have to comply with reliability principles and building standards. Here a specific process called Flow-Based Pultrusion for additive manufacturing (FBP), inspired by pultruded composite manufacturing and built on existing extrusion-based 3D pri...
Article
In the absence of a formwork, printable materials are expected to quickly increase their consistency in order to resist the self-weight of the structure being printed. Resolving this rheological requirement with the printing process is the key to successful printing. It is therefore necessary, from a material design, from a process design and from...
Article
Important developments in additive manufacturing with concrete have been achieved in the past decades. Yet, printed components usually do not comply with building standards or basic reliability principles, and are not commonly used as load-bearing components. A gap between research and practice exists and despite several attempts, off-the-shelf com...
Article
This paper introduces a novel rheological technique allowing for the assessment of printable materials yield stress at nozzle exit in the case of extrusion-based 3D printing. This technique is derived from the analysis of the specific gravity-induced non-Newtonian flow that takes place at nozzle exit, which is at the origin of the formation of mate...
Article
The vast majority of applications of extrusion-based concrete additive manufacturing deal with unreinforced mortar. The lack of reinforcement is a serious limitation for the industrial development of 3d printed concrete, because of the brittleness and lack of tensile strength of unreinforced mortar. In this paper, a new reinforcement method inspire...
Thesis
Full-text available
This work focuses on the reinforcement strategies for large scale additive manufacturing of cementitious materials. This new process allows an important geometrical complexity for constructive elements, generally consuming a lot of material and human resources. In addition, it makes it theoretically possible to industrialize the manufacture of sing...
Chapter
Full-text available
3d printing of cementitious material by pressing layers during the extrusion is a strategy that requires a rather low initial yield stress so the material can deform without cracking. It allows to perfectly control the height of the layer and gives freedom in the orientation of the printing head and of the layer allowing for a wider range of printa...
Chapter
Successful and efficient fabrication using robotic extrusion of cementitious materials mainly relies on the mastering of the printable material fresh state behavior. This paper tackles this aspect by introducing a novel rheological apparatus dedicated to the yield stress measurement at nozzle exit in extrusion-based manufacturing. It is based on th...
Chapter
Full-text available
This paper proposes a specific extrusion method for 3D printing of mortar called free deposition by the authors. It consists in letting a fine mortar flow through a moving nozzle above a support, here EPS foam. The aim is to obtain a regular lace, thus to avoid instability phenomena like coiling, and ensure a regular diameter, without stretching th...
Article
For the last decades, new reparation or fabrication processes have been studied to replace traditional rebar by roving of different mineral or organic fibres to avoid corrosion issues. Such materials refer to the family of cementitious composite. Their tensile strength would directly depend on the proportion of reinforcement and strongly on the int...
Article
Full-text available
For the tens past years, important development has been achieved on the adaptation of additive manufacturing to the construction industry using concrete. They mostly concerns control rheology at fresh state, setting time, and technology advances. Nevertheless, the reinforcement of 3D printed part remains an open question. Different reinforcement pr...
Chapter
The aim of this paper is to discuss the dialectic form-finding of a complex timber structure based on an innovative structural system: shell-nexorade hybrids. Nexorades, also known as reciprocal frames are elegant structures that suffer from a relatively poor structural behavior due to in-plane shear and bending of the members. Introducing plates a...
Conference Paper
Full-text available
This paper presents the design and fabrication of an innovative structure, spanning 6.5m with a structural thickness of 12cm. The structural system derives from nexorades, also called reciprocal frames by some authors, obtained by a novel form-finding method based upon translation of the edges. It also allows for the covering with planar facets if...
Article
Full-text available
In this paper phenomenological observations of the creep rupture under maintained combined traction and torsion loading are first presented. They show the importance of the matrix's behavior in the long-term durability of the material. Understanding and foreseeing creep rupture of unidirectional fiber reinforced polymers (UD FRP) involves comprehen...

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Projects

Projects (3)
Project
Evaluation and characterization of environmental impact of additive manufacturing with cement-based materials on the scale of material, structure and industry-wide.
Project
The aim is to develop a 3D printing process for fibre concrete and to characterize the elements obtained. The research topic is a continuation of the work of the Navier laboratory and is based on the Build'In regional research and development technological platform of the Ecole des Ponts ParisTech, which develops robotic solutions for construction. The thesis focuses on the manufacturing process of the "anisotropic concrete" material scale 1 and the mechanical characterization of the strand and structural elements thus obtained, performance, degradation modes, study of cold joints, cracks etc.... The industrial collaboration with XtreeE is an opportunity to successfully develop an industrial demonstrator.
Project
The THINkSHELL project encourages and accompanies expeditions in the field of structural engineering. It promotes an integrated vision of research, education and fabrication which embraces the whole design process from the very first sketches to the construction of full scale buildings, from material/assembly testings to the development of original numerical tools. The team gathered around the development of the first prototypes of elastic gridshells in composite materials. Nowadays, it combines expertise in the field of architecture, material science, structural engineering, historical buildings, architectural geometry and numerical fabrication.