Method for layer-by-layer deposition of concrete

A system for layer-by-layer deposition of concrete, said system comprising a static mixer having at least a first inlet for introducing a first flow in said static mixer, at least a second inlet for introducing a second flow in said static mixer and at least one outlet for providing a third flow, whereby said first flow comprises a first material, said first material comprising binder material and water, said first flow having a first viscosity V1 ranging between 0.1 Pa·s and 60 Pa·s and a first yield stress Y1, said first material having a first initial setting time T1, said second flow comprising a second material and water, said second material comprising a carrier material comprising powdery material and at least one additional compound,

• said additional compound being a compound when added to said first flow of material being able to reduce the first initial setting time T1 of said first flow of material,
• said second flow having a second viscosity V2 ranging between 0.1 Pa·s and 60 Pa·s and a second yield stress Y2, said second material having an initial setting time T2, whereby said first viscosity V1 and said second viscosity V2 define a ratio V1/V2 ranging between 1/40 and 40 and whereby said second initial setting time T2 is equal to or larger than said first initial setting time T1;
• said material of said first flow and said material of said second flow being mixed in said static mixer to obtain said third flow comprising said extrudable concrete, said third flow comprising a mixture of said first material, said second material and a water, said mixture of said first material and said second material having a third initial setting time T3. said third flow having a third viscosity V3 and a third yield stress Y3, whereby said third viscosity V3 is larger than said first viscosity V1 and larger than said second viscosity V2, whereby said third yield stress Y3 is larger than said first yield stress Y1 and larger than said second yield stress Y2 and whereby said third initial setting time T3 is shorter than said first initial setting time T1.