Dry mix
Factory-blended, delivered to site in jumbo bags.
Printed column · School 08, Doha
013D concrete printing
Layer
by layer.
3D concrete printing, planned by our own software and printed on site in Qatar. Walls rise 20 mm at a time along a toolpath, so they curve without a single mould.
00Mission
From the drawing
to the wall.
One team.
3D concrete printing is our newest line: we run our own printers, write our own planning software and develop printable mixes with Qatar's research institutions. The same team plans it, prints it and hands it over.
0Formwork: the nozzle
shapes the wall
shapes the wall
≥ 35 MPaCompressive strength
at 28 days
at 28 days
30 minFrom arrival
to printing
to printing
6 mMaximum
print height
print height
Printed wall · School 08
Every line
is a layer.
Concrete pumped through a nozzle and laid down one layer at a time, 20 mm high. The shape comes from the toolpath.
01System
C3D MaxiPrinter.
Built in France by Constructions-3D. Improved in Qatar through GGI's R&D. A mobile tracked printer with deployable legs: no foundation, no gantry, and it drives itself to the next room.
2,700kg weight
13.8 mReach diameter
160mm/s max speed
0.85 mWide: fits through a door
| Reach | 13.8 m diameter at 3.85 m height |
| Print height | Up to 6 m, at reduced reach |
| Set-up | 30 min to unfold and print |
| Foundation | None: deployable legs level the machine |
| Moving on | Folds and drives itself to the next room; craned onto the slab for upper floors |
| Folded | 3.15 m long × 1.99 m tall × 0.85 m wide; fits a 20-ft container |
| Pump | M-TEC Duo-Mix 3DCP+, automatic, 15 m hose; water added at the pump |
| Crew | Operators trained and certified by Constructions-3D in France |
01
02
Mixer-pump
M-TEC Duo-Mix 3DCP+ adds the water on site.
03
Hose
Pumped along the arm, through 15 m of hose.
04
Nozzle
Extruded layer by layer, shaped by the toolpath.
02Material
A mix made
to be printed.
Holcim TectorPrint 815 A1, pre-blended and delivered in jumbo bags. Strong enough the next day to keep working on, structural at 28 days.
| Property | Value | What it means |
|---|---|---|
| Compressive strength, 1 day | ≥ 10 MPa | Work on the wall continues the next day |
| Compressive strength, 28 days | ≥ 35 MPa | Structural-concrete range; 7–10 times AAC |
| Tensile splitting, 28 days | ≥ 3.5 MPa | Walls still need steel reinforcement |
| Density | 1,900–2,100 kg/m³ | A little lighter than ordinary concrete |
| Thermal conductivity | 1.8–2.0 W/(m·K) | Insulation comes from filled wall cavities |
| Shrinkage | ≤ 0.7 mm/m | Joints with AAC walls are detailed for movement |
03Build
Answers
from site.
The six questions we hear on every site visit.
- 01
Can you print around rebar?
Yes. We print between the bars; steel and poured concrete then form the structure, with the printed wall as permanent formwork.
- 02
How are openings handled?
A lintel prop goes into the opening while the print continues, and stays in place afterwards.
- 03
Where do the services go?
Channels are cut into the wet material; wires are pulled through conduits inside the wall.
- 04
How is the wall insulated?
Polystyrene beads are poured into the wall cavities from the top.
- 05
Can you print upper floors?
Yes. The 2,700 kg machine is craned onto the slab and prints the next floor.
- 06
How does it leave a room?
It folds onto its tracks and drives out through the door: 0.85 m wide, 1.99 m tall.
04Process
From plan
to print.
Six steps, one team. The same plan drives every stage, and every machine position, print file, approval drawing and material quantity is fixed before we mobilise.
- 01
Site and design review
We confirm the plot, access and ground, and adapt the design for printing.
- 02
Print plan
The planner fixes machine positions, print order and material quantities.
- 03
Approvals
Submission drawings and position layouts come from the same plan.
- 04
Mobilise
MaxiPrinter, mixer-pump, dry mix and a certified crew arrive; the printer unfolds in 30 minutes.
- 05
Print
Walls rise position by position; steel, lintels and service channels go in as they rise.
- 06
Hand over
Cavities are insulated and the printed walls are ready for the next trades.
05Deployed
School 08.
Printed walls and AAC walls on the same school, delivered with Ashghal's Public Private Partnership programme. Two MaxiPrinters on the roof slab.
| Programme | Ashghal Public Private Partnership (PPP) Schools Development Programme |
| Client | Ashghal, Public Works Authority |
| Main contractor | UCC Holding |
| GGI scope | AAC on 10 of 14 schools; printed and AAC walls together at School 08 |
06Printed outside. AAC inside.
One building,
two systems.
Our hybrid: 3D printed outer walls, AAC inner walls and AAC floor and roof slabs, with reinforced concrete columns carrying the loads. First delivered at School 08.
- 01
3D printed outer walls
Free-form, printed on site; the finished façade.
- 02
AAC inner walls
Lightweight panels, 100–200 mm, 4-hour fire rating at 100 mm.
- 03
AAC floor and roof slabs
Reinforced precast panels, quick to set and light on the structure.
07What we print
Villas, majlis,
heritage.
G+1 villas with printed outer walls and AAC inside, in four finishes. A standard majlis with curved printed walls. And Qatar's and the Kingdom's landmark forms, reinterpreted as printed working buildings. Designs available on request.
Villas
One plan, four finishes.
Volcanic Chic · Arid White · Sand Artisan · Sculpted Geometry. Printed outer walls, AAC walls and slabs inside.
Majlis
Curved walls, two glazed fronts.
Our standard majlis, plus the Desert Rose option: walls that flare out as they rise under a sculpted roof line.
Heritage
Landmarks, reprinted.
Barzan Towers, Souq Waqif and Al Zubarah for Qatar; Rijal Almaa, Al-Balad and the Najdi mosque for Saudi Arabia.
Villa, majlis and heritage designs are concept renders.
08Contact
Start a
project.
Send us the drawings, the quantities or just the idea. A GGI engineer replies with a system, a programme and a price.