Method for the construction of a data center

1. A method for the construction of a data center, comprising

(a) providing a fresh concrete composition comprising a paste that comprises a hydraulic binder, a mineral addition other than sand and aggregates, and water, said paste being in a mixture with sand and aggregates, whereby the paste is present in the fresh concrete composition in a volume of <320 L/m 3 and/or the solid volume fraction of said paste is >50 vol.-%, and

(b) placing said fresh concrete composition so as to build walls, a floor and/or a ceiling of the data center, which are intended to surround individual components of computer systems, which are housed in the data center,

wherein said sand and aggregates comprise magnetite sand and/or magnetite aggregate.

2. The method according to claim 1 , wherein the paste is present in the fresh concrete composition in a volume of <300 L/m 3 .

3. The method according to claim 1 , wherein the solid volume fraction of said paste is >55 vol.-%.

4. The method according to claim 1 , wherein water is present in the fresh concrete composition in a volume of <170 L/m 3 .

5. The method according to claim 1 , wherein the fresh concrete composition comprises 1.5 to 12 kg per m 3 of the fresh concrete composition of a water reducer, a plasticizer or a superplasticizer.

6. The method according to claim 1 , wherein Portland cement is used as said hydraulic binder.

7. The method according to claim 1 , wherein the hydraulic binder is present in the fresh concrete composition in an amount of 150-500 kg/m 3 .

8. The method according to claim 1 , wherein a limestone filler or a siliceous filler or a mixture of limestone filler and a siliceous filler is used as said mineral addition.

9. The method according to claim 8 , wherein the mineral addition has a particle size distribution that is characterised by a D50 of ≤10 μm and/or a D98 of ≤100 μm.

10. The method according to claim 1 , wherein a hematite filler is used as said mineral addition.

11. The method according to claim 1 , wherein the skeleton packing density of the aggregate is selected to be >0.69.

12. The method according to claim 1 , wherein the fresh concrete composition comprises a super-plasticiser.

13. The method according to claim 1 , wherein the fresh concrete, after having been placed, is allowed to harden and dry, wherein the thermal resistivity of the concrete once hardened and dried is <0.7 m·K/W.

14. The method according to claim 13 , wherein the 28d compressive strength of the concrete is >20 MPa.

15. The method according to claim 1 , wherein the concrete composition is free from a material having a thermal conductivity of >10 W/m·K.

16. The method according to claim 15 , wherein the concrete composition is free from a material having a thermal conductivity of >20 W/m·K.

17. The method according to claim 8 , wherein said mineral addition includes fine quartz and/or silica flour.

18. A method for the construction of a data center, comprising

(a) providing a fresh concrete composition comprising a paste that comprises a hydraulic binder, a mineral addition other than sand and aggregates, and water, said paste being in a mixture with sand and aggregates, whereby the paste is present in the fresh concrete composition in a volume of <300 L/m 3 and the solid volume fraction of said paste is >45 vol.-%, and

(b) placing said fresh concrete composition so as to build walls, a floor and/or a ceiling of the data center, which are intended to surround individual components of computer systems, which are housed in the data center,

wherein said sand and aggregates comprise magnetite sand and/or magnetite aggregate.