Foam Concrete Filling for 3D-Printed Wall Systems

Construction 3D printing can create two printed wall shells with a designed cavity between them. When specified by the project’s responsible professionals, foam concrete can be produced and placed into that space as part of the completed wall system.

Why Printed Walls May Include a Cavity

A construction 3D printer builds geometry layer by layer. Depending on the approved wall design, the printed paths may form an outer shell, an inner shell and connecting features or a continuous cavity. This approach gives designers freedom to coordinate the printed geometry with reinforcement, utilities and the selected infill system.

The cavity is not automatically interchangeable with a conventional wall assembly. Its dimensions, reinforcement, moisture control, thermal performance and structural role must be determined for the specific project by qualified professionals and evaluated under applicable codes.

What Is Foam Concrete?

Foam concrete is a lightweight cement-based material containing a controlled distribution of air voids. Its density, flow behavior, strength and thermal characteristics depend on the mix design, foaming process, raw materials and production controls.

For a printed wall system, a suitable foam-concrete formulation may be used to fill designed spaces between printed shells. The required formulation and placement procedure must be confirmed for the intended wall design rather than selected from a universal recipe.

Coordinating Printing and Infill

• Wall geometry: the cavity and access points must be included in the approved digital model.
• Print quality: printed shells must have the stability and continuity required for the planned filling operation.
• Material timing: printing, reinforcement, utility placement and filling must follow an agreed sequence.
• Foam-concrete properties: density, workability, setting behavior and expected performance must be verified.
• Placement control: filling must avoid excessive pressure, segregation, incomplete areas and damage to the printed shells.

The AMTG Equipment Package

AMTG can supply a foam-concrete machine together with the construction 3D printer, synchronized mixer, material pump and power generator. The purpose is to give the equipment owner a coordinated production package rather than an isolated printer.

AMTG also provides technical consultations, assistance with checking files for printing, proprietary material recipes for different process requirements and recommendations for commercially available mixes where appropriate. Recipe variables can include setting time, color, aggregate fraction and plasticity.

Review the complete construction 3D printing system and support package or compare the available AMTG construction 3D printers.

Project Responsibility

AMTG manufactures and supplies equipment and provides technical support. The customer and the customer’s appointed professionals remain responsible for wall design, structural engineering, reinforcement, utilities, materials approval, testing, permits, code compliance, construction procedures and the completed building.

Discuss the Required Workflow

The correct printing and filling configuration depends on the planned structure, wall geometry, materials, production environment and applicable engineering requirements.