scholarly journals Material Design and Performance Evaluation of Foam Concrete for Digital Fabrication

Materials ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2433 ◽  
Author(s):  
Markin ◽  
Nerella ◽  
Schröfl ◽  
Guseynova ◽  
Mechtcherine
Keyword(s):  
3D Printing ◽  
Building Materials ◽  
Methodological Approach ◽  
Three Dimensional ◽  
Physical And Mechanical Properties ◽  
Material Design ◽  
Digital Fabrication ◽  
Systematic Investigation ◽  
Foam Concrete ◽  
Fresh State

Three-dimensional (3D) printing with foam concrete, which is known for its distinct physical and mechanical properties, has not yet been purposefully investigated. The article at hand presents a methodological approach for the mixture design of 3D-printable foam concretes and a systematic investigation of the potential application of this type of material in digital construction. Three different foam concrete compositions with water-to-binder ratios between 0.33–0.36 and densities of 1100 to 1580 kg/m³ in the fresh state were produced with a prefoaming technique using a protein-based foaming agent. Based on the fresh-state tests, including 3D printing as such, an optimum composition was identified, and its compressive and flexural strengths were characterized. The printable foam concrete showed low thermal conductivity and relatively high compressive strengths of above 10 MPa; therefore, it fulfilled the requirements for building materials used for load-bearing wall elements in multi-story houses. Thus, it is suitable for 3D-printing applications, while fulfilling both load-carrying and insulating functions.

scholarly journals Material Design and Performance Evaluation of Foam Concrete for Digital Fabrication

2019 ◽  
Author(s):  
Viacheslav Markin ◽  
Venkatesh Naidu Nerella ◽  
Christof Schröfl ◽  
Gyunay Guseynova ◽  
Viktor Mechtcherine
Keyword(s):  
3D Printing ◽  
Methodological Approach ◽  
Physical And Mechanical Properties ◽  
Material Design ◽  
Digital Fabrication ◽  
Systematic Investigation ◽  
Foam Concrete ◽  
State Tests ◽  
Fresh State ◽  
Compressive And Flexural Strengths

3D-printing with foam concrete, which is known for its distinct physical and mechanical properties, has not yet been purposefully investigated. The article at hand presents a methodological approach for the mixture design of 3D-printable foam concretes and a systematic investigation of the potential application of this type of material in digital construction. Three different foam concrete compositions with water-to-binder ratios between 0.33 and 0.36 and having densities of 1100 to 1580 kg/m³ in the fresh state were produced with a pre-foaming technique using a protein-based foaming agent. Based on the fresh-state tests, including 3D-printing as such, an optimum composition was identified and its compressive and flexural strengths were characterised. The printable foam concrete showed compressive strength above 10 MPa and low thermal conductivity, which make it suitable for 3D-printing applications, while fulfilling both load-carrying and insulating functions.

scholarly journals Low cost digital fabrication approach for thumb orthoses

2017 ◽  
Vol 23 (6) ◽  
pp. 1020-1031 ◽  
Author(s):  
Miguel Fernandez-Vicente ◽  
Ana Escario Chust ◽  
Andres Conejero
Keyword(s):  
3D Printing ◽  
Computer Aided Design ◽  
Low Cost ◽  
Three Dimensional ◽  
Recovery Process ◽  
Digital Fabrication ◽  
Cost Comparison ◽  
Content Type ◽  
Custom Made ◽  
The Impact

Purpose The purpose of this paper is to describe a novel design workflow for the digital fabrication of custom-made orthoses (CMIO). It is intended to provide an easier process for clinical practitioners and orthotic technicians alike. It further functions to reduce the dependency of the operators’ abilities and skills. Design/methodology/approach The technical assessment covers low-cost three-dimensional (3D) scanning, free computer-aided design (CAD) software, and desktop 3D printing and acetone vapour finishing. To analyse its viability, a cost comparison was carried out between the proposed workflow and the traditional CMIO manufacture method. Findings The results show that the proposed workflow is a technically feasible and cost-effective solution to improve upon the traditional process of design and manufacture of custom-made static trapeziometacarpal (TMC) orthoses. Further studies are needed for ensuring a clinically feasible approach and for estimating the efficacy of the method for the recovery process in patients. Social implications The feasibility of the process increases the impact of the study, as the great accessibility to this type of 3D printers makes the digital fabrication method easier to be adopted by operators. Originality/value Although some research has been conducted on digital fabrication of CMIO, few studies have investigated the use of desktop 3D printing in any systematic way. This study provides a first step in the exploration of a new design workflow using low-cost digital fabrication tools combined with non-manual finishing.

Steel Parts with Tailored Material Gradients by 3D-Printing Using Nano-Particulate Ink

2005 ◽  
Vol 492-493 ◽  
pp. 679-684 ◽  
Author(s):  
Dirk Godlinski ◽  
Stéphane Morvan
Keyword(s):  
3D Printing ◽  
Solid Freeform Fabrication ◽  
Three Dimensional ◽  
Material Design ◽  
Nano Particles ◽  
Layer By Layer ◽  
Steel Matrix ◽  
Local Composition ◽  
Composition Control ◽  
Halftone Image

It is difficult to generate any user-defined three dimensional gradient to tailor the functional properties of a component. Problems are not only the lack of local material design tools, but also a suitable manufacturing process. The implementation of the concept of local composition control into the Solid Freeform Fabrication (SFF) process 3D-Printing is described, which leads to geometrical complex parts out of tailored materials. Suspensions of different functional inks containing a binder and carbon black nano-particles are dispensed into droplets through multiple jets – like inkjet printing a halftone image on a paper – but into a metal powder bed to generate layer by layer graded green parts. In this case the tailored preforms are then sintered, while the nano-particle additions from the functional ink act locally as alloying elements in the steel matrix to combine e.g. both, toughness and hardness in the part. This work concentrates on the realisation of the new process and shows first results taking the generation of carbon-graded steel parts as an example.

Testing and Optimization of Production of Technical Foam for the Production of Cement Foam

2018 ◽  
Vol 276 ◽  
pp. 254-258
Author(s):  
Karel Mikulica ◽  
Dušan Dolák
Keyword(s):  
Mechanical Properties ◽  
Czech Republic ◽  
Construction Industry ◽  
Building Materials ◽  
Cement Mortar ◽  
Physical And Mechanical Properties ◽  
Foam Concrete ◽  
The Czech Republic ◽  
Insulation Materials ◽  
The Many

In the current construction industry, great importance is given to the usage of thermally insulating building materials. One of the many such materials can be a cement foam or foam concrete, a mixture of cement mortar and technical foam. This material can be, due to its consistency right after mixing, applied to uneven horizontal surfaces where usage of conventional thermal board insulation materials would be complicated. This paper discusses the methodology of testing of the physical and mechanical properties of foaming additives such as strength, density, foaming number and half-separability of technical foams. Then this methodology was subsequently verified on the five commonly used foaming additives in the Czech Republic.

3D/4D printed tunable electrical metamaterials with more sophisticated structures

2021 ◽  
Author(s):  
Dou Yang ◽  
Hui Mei ◽  
Li Yao ◽  
Wenqiang Yang ◽  
Yongtao Yao ◽  
...  
Keyword(s):  
3D Printing ◽  
Three Dimensional ◽  
Material Design ◽  
Manufacturing Technology ◽  
Advanced Manufacturing Technology ◽  
Advanced Manufacturing ◽  
Novel Material ◽  
Design Idea

As a novel and attractive advanced manufacturing technology, three-dimensional (3D) printing can realize the manufacturing of devices with more sophisticated structures. Metamaterials (MMs) are a novel material design idea based...

scholarly journals Reparameterizing Tectonics Perception on Planar Material-Design

2019 ◽  
Vol 6 (1) ◽  
pp. 69-77
Author(s):  
Stephanus Evert Indrawan ◽  
Gervasius Herry Purwoko ◽  
Tri Noviyanto P. Utomo
Keyword(s):  
Building Materials ◽  
Design Thinking ◽  
Material Design ◽  
Digital Fabrication ◽  
Computational Approach ◽  
Design Tools ◽  
Early Stages ◽  
Milling Machines ◽  
Planar Materials

Indonesia is known as a country rich in types of building materials and technologies inherited from generation to generation. Along with the passage oftime appears the computer as a human tools. However during the materialsprocessing this computational approach is still separated. Computers are still usedas tools for drawing and not used as design tools in the design thinking process.Computational design has an ability to integrating the design focus from thematerial side, structure, and formation associated with digital fabrication. Thispaper focuses to divide concepts of tectonics as general and relate them to theunderstanding of digital perception. This paper also presents the results of a studythat has involved digital perception in the study of planar materials and wafflestructure systems from the early stages to the model of construction. Plywood isthe only material used, made with milling machines and built by students. Thisprocess introduces students to different experience of the design process.Computational design makes possibilities to integrating the design focus from thematerial side, structure, and formation associated with digital fabrication.

3D-printing with foam concrete: from material design and testing to application and sustainability

2021 ◽  
pp. 102870
Author(s):  
Viacheslav Markin ◽  
Martin Krause ◽  
Jens Otto ◽  
Christof Schröfl ◽  
Viktor Mechtcherine
Keyword(s):  
3D Printing ◽  
Material Design ◽  
Foam Concrete ◽  
Design And Testing

Polymer Fibers in Foam Concrete Application Efficiency

2021 ◽  
Vol 1043 ◽  
pp. 55-59
Author(s):  
Vladimir Morgun ◽  
Denis Votrin ◽  
Aleksei Revyakin
Keyword(s):  
Building Materials ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Fiber Reinforced Concrete ◽  
Polymer Fibers ◽  
Synthetic Fiber ◽  
Foam Concrete ◽  
Concrete Mixtures ◽  
Technical Effect ◽  
Moduli Of Elasticity

The urgency of improving the performance properties of concrete, as the most common building materials, is noted. The reasons for the increased demand for products made of high-strength gas-filled concrete are stated. It is shown that the current volume of polymer fibers production makes it possible to predict the possibility of their widespread use in construction. The information on the physical and mechanical properties of synthetic fiber, which is important for its successful use as dispersed reinforcement of foam concrete mixtures, is presented. The technology of manufacturing experimental samples and methods of their testing are described. It has been established that the introduction of any synthetic fiber into the foam mixture formulation improves the structural properties of foam concrete, however, the measure of efficiency depends on the ratio between the concrete moduli of elasticity and fiber. The greater the value of the elastic modulus of the fiber used, the higher the technical effect of its use in fiber-reinforced concrete for structural purposes can be.

scholarly journals Additive Manufacturing of Reinforced Concrete—Development of a 3D Printing Technology for Cementitious Composites with Metallic Reinforcement

2020 ◽  
Vol 10 (11) ◽  
pp. 3791 ◽  
Author(s):  
Martin Classen ◽  
Jan Ungermann ◽  
Rahul Sharma
Keyword(s):  
Reinforced Concrete ◽  
Additive Manufacturing ◽  
3D Printing ◽  
Three Dimensional ◽  
Welding Process ◽  
Plain Concrete ◽  
Digital Fabrication ◽  
Extrusion Process ◽  
Rc Structures ◽  
Stud Welding

Reinforced concrete (RC) is by far the most widely used composite material in the world. Despite the enormous economic importance of RC construction, there is a lack of viable concepts for its digital fabrication. While 3D printing of plain concrete has been pushed forward by a growing research community in recent years, methods for integration of steel reinforcement have only scarcely been researched and little attention has been payed to meet the practical requirements of construction sites and prefabrication plants. Therefore, full-scale implementations of current approaches are hardly available. Based on both, a sound review of R&D for digital fabrication of RC structures and an analysis of practical requirements, the present paper proposes a novel 3D printing process for RC structures, called Additive Manufacturing of Reinforced Concrete (AMoRC), viable for real-world application. In this hybrid process, consisting of an intermittent stud welding process and a continuous concrete extrusion process, segmented steel reinforcing bars are joined to form a three-dimensional reinforcement mesh and simultaneously encased with extruded concrete. The paper describes the conceptual design and development of the process and demonstrates the results of preliminary investigations on its feasibility. As AMoRC enables the operation of rebar welding and concrete extrusion process with synchronized feed rates, combination of both processes in one hybrid print head for digital fabrication of RC is a key-advantage of the proposed method.

scholarly journals Efficacy evaluation of three-dimensional printing assisted osteotomy guide plate in accurate osteotomy of adolescent cubitus varus deformity

2019 ◽  
Vol 14 (1) ◽  
Author(s):  
Yuan-Wei Zhang ◽  
Xin Xiao ◽  
Wen-Cheng Gao ◽  
Yan Xiao ◽  
Su-Li Zhang ◽  
...  
Keyword(s):  
3D Printing ◽  
Blood Loss ◽  
Three Dimensional ◽  
Operation Time ◽  
Varus Deformity ◽  
Conventional Group ◽  
Intraoperative Blood Loss ◽  
Cubitus Varus ◽  
Guide Plate ◽  
Significant Difference

Abstract Background This present study is aimed to retrospectively assess the efficacy of three-dimensional (3D) printing assisted osteotomy guide plate in accurate osteotomy of adolescent cubitus varus deformity. Material and methods Twenty-five patients (15 males and 10 females) with the cubitus varus deformity from June 2014 to December 2017 were included in this study and were enrolled into the conventional group (n = 11) and 3D printing group (n = 14) according to the different surgical approaches. The operation time, intraoperative blood loss, osteotomy degrees, osteotomy end union time, and postoperative complications between the two groups were observed and recorded. Results Compared with the conventional group, the 3D printing group has the advantages of shorter operation time, less intraoperative blood loss, higher rate of excellent correction, and higher rate of the parents’ excellent satisfaction with appearance after deformity correction (P < 0.001, P < 0.001, P = 0.019, P = 0.023). Nevertheless, no significant difference was presented in postoperative carrying angle of the deformed side and total complication rate between the two groups (P = 0.626, P = 0.371). Conclusions The operation assisted by 3D printing osteotomy guide plate to correct the adolescent cubitus varus deformity is feasible and effective, which might be an optional approach to promote the accurate osteotomy and optimize the efficacy.

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