Léo DemontÉcole des Ponts ParisTech · Laboratoire Navier
Léo Demont
MArch
About
12
Publications
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Introduction
I am an architect and PhD candidate working on the development of a 1:1 scale process for 3D printing of concrete with long fibres. I also have an interest in interactive inflatable structures.
Publications
Publications (12)
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...
Various technologies of in-line reinforcement for extrusion-based 3D printing have been proposed in the recent years. With such techniques, knowledge of the dynamic rheological properties of the extruded material is a key point for several issues, such as its ability to properly impregnate reinforcement, and possibly to pull the reinforcement thank...
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...
Polydon is an inflatable-deployable structure demonstrator. It is interactive and offers various spatial conditions depending on the membrane folds.
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...
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...
This work aims at proposing a strategy for 3D-printing geopolymer composite structures at a half-meter scale, without using organic additives. An original printing device based on cartridges is developed and adapted to a 6-axis robot. The yield stress, working time and apparent Young modulus of the extruded material are measured. A devoted software...
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...
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...
![Fig. 8. Prototype of double curvature unreinforced concrete truss [26]....](publication/340938018/figure/fig5/AS:884764059910144@1587955598042/Prototype-of-double-curvature-unreinforced-concrete-truss-26-Photography-Stefano-Borghi_Q320.jpg)
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...
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...
Projects
Projects (2)
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.
Dynamorphe is a collective of architects developing itinerable and interactive architectures by crossing over constructive geometry, system control and inflatable structures design. Please visit dynamorphe.fr/projets.html
