Cement composition for 3D printing and method of use
A novel cement composition for 3D printing including has 90% to 99.5% by weight of one or more cements selected from a Portland cement, an aluminous cement, a sulphoaluminous cement and a prompt natural cement; and has 0.5% to 10% by weight of a silicoaluminous filler having a specific surface area of at least 5 m 2 /g, as well as a method for implementing the composition.
1. A cement composition comprising:
from 95% to 99.5% by weight of a Portland cement and a sulphoaluminous cement; and
from 0.5% to 5% by weight of a filler selected from the group consisting of a silicoaluminous filler, silica fume, and a combination of a silicoaluminous filler and silica fume, wherein the filler has a specific surface area of at least 5 m 2 /g,
wherein the cement composition is adapted for 3D printing,
wherein the cement composition further contains a limestone filler and/or a setting retarder.
2. The cement composition according to claim 1 , wherein the cement composition contains from 10% to 95% by weight relative to the total weight of cement of a Portland cement.
3. The cement composition according to claim 1 , wherein the silicoaluminous filler is selected from natural pozzolans and calcined clays.
4. A 3D printing method comprising the following steps:
contacting the cement composition according to claim 1 with water optionally added with superplasticizer and mixing of the whole;
pumping of the composition thus obtained to a print head and optionally adding a setting trigger;
printing.
5. A kit for the preparation of a cement composition for 3D printing according to claim 1 , said kit comprising:
a Portland cement;
and a sulphoaluminous cement;
wherein the filler selected from the group consisting of a silicoaluminous filler, silica fume, and a combination of a silicoaluminous filler and silica fume, is present in an element of the kit containing the Portland cement and/or in an element of the kit containing the sulphoaluminous cement, and
wherein the limestone filler and/or setting retarder is present in an element of the kit containing the Portland cement and/or in an element of the kit containing the sulphoaluminous cement.
6. A 3D printing method implementing the kit according to claim 5 comprising the following steps:
contacting the composition containing Portland cement optionally added with superplasticizer with water and mixing the whole and, separately, bringing the composition containing the sulphoaluminous cement into contact with water optionally added with superplasticizer and mixing of the whole;
pumping each of the compositions thus obtained to a print head, bringing them into contact, optionally in the presence of a setting trigger; and
printing.
7. The cement composition according to claim 1 , wherein the cement composition does not contain a hardening inhibitor.
8. A cement composition consisting essentially of:
from 95% to 99.5% by weight of a Portland cement and a sulphoaluminous cement;
from 0.5% to 5% by weight of a filler selected from the group consisting of a silicoaluminous filler, silica fume, and a combination of a silicoaluminous filler and silica fume, wherein the filler has a specific surface area of at least 5 m 2 /g; and
optionally, a limestone filler and/or a setting retarder,
wherein the cement composition is adapted for 3D printing,
wherein the cement composition further contains a limestone filler and/or a setting retarder.
9. The cement composition according to claim 8 , wherein the silicoaluminous filler is selected from natural pozzolans and calcined clays.
10. The cement composition according to claim 8 , wherein the cement composition does not contain a hardening inhibitor.