DIGITAL CONCRETE SCA & SPI

In 2020, we created a pretty big factory with a pretty big printer inside that can create pretty big parts through a novel manufacturing technology. Selective Cement Activation (SCA) is a novel technology for the additive manufacturing of building components. It bridges the gap between additive (serial) production and construction in a radically new way. Moreover, it opens up the possibility scale 3D Printing in size and speed while enabling the usage of sustainable material alternatives.

DIGITAL CONCRETE SCA & SPI

In 2020, we created a pretty big factory with a pretty big printer inside that can create pretty big parts through a novel manufacturing technology. Selective Cement Activation (SCA) is a novel technology for the additive manufacturing of building components. It bridges the gap between additive (serial) production and construction in a radically new way. Moreover, it opens up the possibility scale 3D Printing in size and speed while enabling the usage of sustainable material alternatives.

THE BIG
FUTURE
FACTORY

An activator (water or salt water) is sprayed from a print head onto a thin powder layer containing a cementitious binder, causing the individual particles to bond. A new layer is then applied, and the component is built up three-dimensionally, layer by layer. The starting material is econit, a cementitious material with excellent functional properties comparable to concrete and, in some cases, surpassing its characteristics. A wide range of esthetic, functional, and technical material properties can be obtained by switching aggregates from sand to brick chippings, expanded clay, or wood chips. Combined with geometric freedom can holistically manipulate density, compressive strength, and thermal or sound insulation of the building components.

worker walking in front of machine for 3d printing with SCA technology

THE BIG

FUTURE

FACTORY

An activator (water or salt water) is sprayed from a print head onto a thin powder layer containing a cementitious binder, causing the individual particles to bond. A new layer is then applied, and the component is built up three-dimensionally, layer by layer. The starting material is econit, a cementitious material with excellent functional properties comparable to concrete and, in some cases, surpassing its characteristics. A wide range of esthetic, functional, and technical material properties can be obtained by switching aggregates from sand to brick chippings, expanded clay, or wood chips. Combined with geometric freedom can holistically manipulate density, compressive strength, and thermal or sound insulation of the building components.

CLOSING THE
DIGITAL CHAIN

Planning and production rely on a single 3D model that flows though an end-to-end digitalized process. In the big future factory, we can transfer digital designs from virtuality to reality with the press of a button, exactly like planned.
The factory is designed to perform under high loads with different types of building materials. Production capacity here is two cubic meters of material per hour, and we can fabricate up to 22 hours a day.
(that is 44m³ of printing each day if our math is correct)

worker walking in front of machine for 3d printing with SCA technology

CLOSING THE

DIGITAL CHAIN

Planning and production rely on a single 3D model that flows though an end-to-end digitalized process. In the big future factory, we can transfer digital designs from virtuality to reality with the press of a button, exactly like planned.
The factory is designed to perform under high loads with different types of building materials. Production capacity here is two cubic meters of material per hour, and we can fabricate up to 22 hours a day.
(that is 44m³ of printing each day if our math is correct)

MATERIAL

Econit is a novel sustainable material system at the intersection of additive manufacturing and building construction. As a base material, econit can bind various aggregates, even in large quantities.
Our aggregate of choice for producing standard parts econit Air is recycled glass granulates filled with air. For this material, we use glass that cannot be used for the production of bottles anymore, as it has exceeded its lifespan. So, we use these leftovers to produce a very lightweight yet sturdy construction material with excellent insulation properties.

MATERIAL

Econit is a novel sustainable material system at the intersection of additive manufacturing and building construction. As a base material, econit can bind various aggregates, even in large quantities.

Our aggregate of choice for producing standard parts econit Air is recycled glass granulates filled with air. For this material, we use glass that cannot be used for the production of bottles anymore, as it has exceeded its lifespan. So, we use these leftovers to produce a very lightweight yet sturdy construction material with excellent insulation properties.

By combining econit with scrap wood or other aggregates, we can produce elements that can be very complex, made of locally available material, with unique materiality.
Every material parameter needs to be understood to achieve a material mixture that fulfills our standards. We ensure reliable manufacturing performance by grinding our material to the correct grain sizes, and quality control the fabrication process from start to finish.

By combining econit with scrap wood or other aggregates, we can produce elements that can be very complex, made of locally available material, with unique materiality.

Every material parameter needs to be understood to achieve a material mixture that fulfills our standards. We ensure reliable manufacturing performance by grinding our material to the correct grain sizes, and quality control the fabrication process from start to finish.

With Selective Cement Activation, individual, freely shaped prefabricated elements up to a size of 4m or 10m³ can be produced without formwork. The components have a high level of detail accuracy (layer thickness 1-3mm), are dimensionally stable, free of warpage, weatherproof, exceptionally hard, mineral and fire-retardant. Depending on the composition of the components, they are recyclable, CO2-neutral and sustainable, as wood and other renewable raw materials can be used as aggregates. If desired, the components can be colored through with lightfast, UV-resistant pigments or paints.

SCA is ideal for e.g.:

  • Prefabricated elements for the outside of the building, e.g. facades
  • Prefabricated elements for the interior of the building, e.g. stairs, columns, wall elements
  • Design objects and artworks

With Selective Cement Activation, individual, freely shaped prefabricated elements up to a size of 4m or 10m³ can be produced without formwork. The components have a high level of detail accuracy (layer thickness 1-3 mm), are dimensionally stable, free of warpage, weatherproof, exceptionally hard, mineral and fire-retardant. Depending on the composition of the components, they are recyclable, CO2-neutral and sustainable, as wood and other renewable raw materials can be used as aggregates. If desired, the components can be colored through with lightfast, UV-resistant pigments or paints.

SCA is ideal for e.g.:

  • Prefabricated elements for the outside of the building, e.g. facades
  • Prefabricated elements for the interior of the building, e.g. stairs, columns, wall elements
  • Design objects and artworks

Concept & Development

Concept & Development

Material Testing and Development

Sometimes there is no ready-made solution for materials in art architecture or construction. Therefore, development or certification is often needed when it comes to innovative ideas, applications, or process combinations.
Our development engineers, with many years of know-how and state-of-the-art equipment, are the proper support team.

Cost and Risk Evaluation

In the design phase, it is sometimes tough to grasp the risks of a project, especially when innovative ideas are applied.
Our experts are guides through the jungle of novel possibilities. They can quickly evaluate design versions for cost and risk and help to transform a great idea into a manageable project.

Fabrication Consultancy

Our experts explore various technological, material, and construction options to meet the requirements of a project or product. With input from our craftspeople during the design process, we can problem-solve foreseeable fabrication issues that might occur before we start with the production.

Process Development

The world changes, so we have to stay flexible. Therefore, we offer alternative fabrication processes tailored towards project requirements to manufacture faster, cheaper, or maybe just different.
The same goes for customized software solutions to venture into novel design methods.

Ingredients List & Carbon Audit

We collaborate with our clients to calculate a project’s carbon emission by creating its ingredients list. This allows our client an inside view of the production. A life cycle analysis can also include the ‘end of use’ – repair, reuse, recycle, or take back.

Installation Methology

Our project team can assist, manage, organize and explore the best possible methods for the installation of projects. Until a certain size, our team undertakes all aspects of the installation, including handling and packing, transportation, and assembly.

Digital Design

Digital Design

3D Scanning

An optical 3D scan is used to perform an exact shape and dimension analysis of an element without contact. In preparation, the surface is coated with a special spray, and adhesive dots are applied to the object to ensure sufficient measuring points are available even for reflective surfaces and undercut objects. The result is complete measurement data without holes or faulty points. We then convert the point cloud into a 3D Mesh.

Digital Detailing

Although we sometimes still need physical construction drawings for the construction site, detail documentation now includes fabrication information, such as nesting layouts and G-code files that are sent to our machines and robots. In addition, our 3D models now allow us to generate details dynamically. Architectural details can also be generated by algorithms and can be presented to the construction team through a set of animations that show e.g. assembly.

Individual Process Chain

Some Projects do not fit into an existing process. Which often means the process itself has to adapt. With our robotic cells and mechanical engineering team, we can adjust a process for particular conditions or needs and test it until it runs smoothly. Imagine this like a bespoke fabrication chain for a unique idea.

Digital Modelling & Renders

Some Projects do not fit into an existing process. Which often means the process itself has to adapt. With our robotic cells and mechanical engineering team, we can adjust a process for particular conditions or needs and test it until it runs smoothly. Imagine this like a bespoke fabrication chain for a unique idea.

Parametric Design

Additive design is the key to a world of innovative geometries for the future of architecture. We provide the necessary computational know-how to parameterize a design’s inherent logic and generate multiple versions or adjust it automatically to site- or project-specific circumstances.

Advanced Robotics

We invest heavily in the bleeding edge of new technologies and processes for making and manufacturing. Our six state-of-the-art robotic arms, virtual and augmented reality vision systems can be utilized to unlock the great potential that lies in the combination of the digital and analog world.

Fabrication-oriented Design

We are masters in design-thinking with a Bottom-Up approach. For example, what material-fabrication-assembly combination would suit a project best? How can we solve a detail holistically, so we save time and money later? By having design and fabrication specialists under one roof, we aim to help designers realize their idea efficiently.

Architectural Design

With a small team of in-house architects, we can provide fabrication-specific design ideas and articulate their architectural expression. Especially with emerging technologies, a novel architectural language develops over time, and we speak additive already quite fluently.

Fabrication Simulation

There is an old saying: “measure twice, cut once.” Regarding digital fabrication, we changed it to: “Simulate before you fabricate.”
With our novel digital toolset, there are many ways to experience fabrication and assembly beforehand, which leads to early error detection and a better grasp on risks, time and cost.

Fabrication

Fabrication

Selective Cement Activation(SCA)

Selective Cement Activation, SCA for short, is a novel technology for the additive manufacturing of building components. It bridges the gap between additive (serial) production and construction in a radically new way and opens up the possibility scale 3D Printing in size and speed, while enabling the usage of sustainable material alternatives.

Robotic FDM

Robotic FDM works according to the principle of classic FDM (Fused Deposition Modeling), with the difference that the extruder is attached to a swiveling robot arm. Due to the robot arm’s action radius of 3m, significantly larger objects become feasible. The 6- or 8-axis industrial robots enable precise and individual material placement at the highest level of complexity.

Robotic WAAM

Robotic Wire Arc Additive Manufacturing (WAAM) is a technology that welds metal in layers using a wire arc to build up the component additively. The technology has high deposition rates resulting in fast buildup rates (600 cm³/h) as well as short production times and is impressive due to its broad material selection and low material costs.

Electron Beam Melting (PBF-EB/M)

In electron beam melting (EBM or PBF-EB/M), titanium powder is melted layer by layer at defined coordinates, similar to laser melting (PBF-LB/M), but by means of an electron beam in a high vacuum and thus joined to form a component. A cathode heated to 2,500 °C emits electrons for this purpose, which are directed by electromagnetic fields and strike the metal powder at half the speed of light.

Wire Arc Additive Manufacturing (WAAM)

Robotic Wire Arc Additive Manufacturing (WAAM) is a wire-based technology that welds metal in layers using a wire arc to build up the component additively. The technology has high deposition rates resulting in high buildup rates (600 cm³/h) as well as short production times and is impressive due to its broad material selection and low material costs.

Supersonic 3D Deposition (SP3D)

In Supersonic 3D Deposition (SP3D), the layer buildup is based on the principle of cold spray, i.e. metal powder is accelerated through a rocket nozzle to three times the speed of sound, which makes the individual particles bond with each other by deformation due to the high kinetic energy, thus forming the component. The component is created as a near-net-shape blank, which is then finished by CNC milling either completely or only on the required functional surfaces.

Laser Melting (PBF-LB/M)

In laser melting (LM or PBF-LB/M), metal powder is deposited layer by layer onto a build platform, with each layer heated to the melting point at specified coordinates by laser beams. By fusing the powder within a layer and across multiple layers, the component is built up in three dimensions. Unlike electron beam melting (EBM or PBF-EB/M), the build space is not preheated, resulting in a high temperature difference between the processed and the already cooled layers.

Selective Laser Sintering (PBF-LB/P)

In selective laser sintering (SLS resp. PBF-LB/P), as in all laser powder bed fusion technologies, plastic powder is deposited over the entire surface of a build platform. A CO2 laser heats the plastic particles at predefined coordinates almost to their melting point, causing them to bond together. Once a layer has been produced, the build platform is lowered, a new layer of powder is applied and the component is thus produced in three dimensions.

Stereolithography (SLA)

In stereolithography (SLA), the first and longest-used 3D printing process, a duroplastic synthetic or epoxy resin (photopolymer) is cured by an ultraviolet laser beam guided along the component contours via movable mirrors. Once the layer is completely cured, the build space is lowered, a new layer is applied and the entire component is thus built up in three dimensions. Support structures are required to fix the components in the liquid build space, and these are removed manually afterwards.

Digital Light Processing (DLP)

Digital Light Processing (DLP) uses a liquid photopolymer that is cured by UV light projection. Unlike stereolithography (SLA), the light does not penetrate the material from above but from below through the transparent bottom of the build plate (top-bottom process). The component is thus exposed to light layer by layer and pressed upwards out of the build space.

Selective Paste Intrusion

Selective paste intrusion (SPI) bonds thin layers of aggregate by cement paste locally. SPI can achieve better compressive strength, durability, and unpacking behavior compared to other selective binding methods and is suitable for producing concrete structures. This additive manufacturing method has little to no restrictions concerning freedom of form and works with traditional cement pastes or novel sustainable cement alternatives.

Binder Jetting

In binder jetting, also known as Drop on Powder (DOP) technology, a liquid binder is sprayed from a print head, similar to an inkjet printer, along the component contours onto a thin layer of plastic powder and causes the individual plastic particles to stick together. The build area is then lowered, a new layer of powder is applied and the entire component is built up three-dimensionally in several layers.

PolyJet

In the PolyJet process, also known as Fine Layer Technique (FLT), a liquid photopolymer is sprayed from an inkjet print head along the component contours onto the build platform and immediately cured using UV light. The build platform is then lowered and the next layer of the component is applied. Depending on the geometry of the component, PolyJet requires support structures to attach the component to the build platform and support overhangs.

Fused Deposition Modeling (FDM)

FDM may not be the first but the best-known 3D printing technology. It was developed in the late 1980s and has evolved to be a very mature and stable technology. The technology is similar to that of a hot glue gun. A wire-shaped, thermoplastic filament is heated to the melting point in an extruder and deposited in liquid form onto a build platform along the contours of the component.

Gel Dispensing Printing (GDP)

In Gel Dispensing Printing (GDP), a highly viscous gel (white photopolymer acrylate) is applied layer by layer from an extruder under computer control and immediately cured using UV light. The build area is then lowered and the next layer of the component is applied. With GDP, almost all geometries can be built as hollow bodies and without support structures, which has a positive effect on manufacturing costs and times.

Ceramic Printing

In ceramic printing, which is based on the principle of binder jetting, a liquid binder is sprayed from a print head, similar to an inkjet printer, in layers along the component contours onto a ceramic powder, causing the individual particles to stick together. The material used is Amcelain, a special ceramic powder developed for this technology. After manufacturing, the green compacts are fired for the first time.

Vacuum Casting

The basis for vacuum casting is the production of a master pattern, which is manufactured in 3D printing using stereolithography (SLA). The master pattern is fixed in a frame after the mold separation, sprue and risers have been determined. The frame is then poured with a 2K silicone. After the silicone has cured, the silicone mold is cut open with a scalpel along the defined mold parting line and the master pattern is removed.

CNC Milling

CNC milling is a metal-cutting manufacturing process for the production of components with a geometrically precisely defined shape, with CNC standing for “Computerized Numerical Control”. Based on a CAD model, a tool that resembles a twist drill but has a different cutting geometry is guided against the workpiece by computer to remove chips from the component. In contrast to additive technologies, in which material is applied, milling is a subtractive technology.

Welding & Assembly

Depending on the project definition, single components (either manufactured by additive tectonics, purchased, or provided by the customer) are mounted to accomplish the entire assembly. This can be done by a catalog of options available in additive tectonics‘s model building department, e.g. by screwing, gluing, or welding of metal or plastic parts.

Painting

In order to achieve the desired result by painting, various preparatory steps are necessary, e.g. to eliminate a corrugated structure or other surface defects. Before paint or clear-coat is applied, the component is initially cleaned of loose material residues by blasting, followed by priming and/or filling as well as sanding. This process can be repeated, if necessary, until the required surface quality is achieved. After completion of the preparatory steps, the component can be painted. Textured, matte, gloss, or high-gloss paint can be mixed in almost all RAL and Pantone colors, to be applied in one or more color layers.

Model Making

To ensure that a project or product makes the most convincing impression right from the start, absolutely realistic concept and design models are essential. Therefore, precision, attention to detail, and perfect surfaces are necessary. We manufacture prototypes and transform them with craft and state-of-the-art technology into works of art.