Method for the refurbishment of porous construction materials
A method for the refurbishment of porous construction materials and a composition including Portland cement, calcined clay, and optionally aggregate to be used in the method for the refurbishment of porous construction materials. The method includes the steps of mixing water and a composition C, the composition C including, a) 100 mass parts of Portland Cement, b) 1-18 mass parts, preferably 1-10 mass parts, more preferably 1-7.5 mass parts, still more preferably 1-6 mass parts, especially 1-5 mass parts of calcined clay, c) optionally 10-250 mass parts of aggregates, applying the mixture thus obtained to a porous construction material, and optionally hardening the applied mixture.
1 . A method for a refurbishment of porous construction materials, the method comprising:
mixing water and a composition C to form a mixture, the composition C comprising:
a) 100 mass parts of Portland Cement,
b) 1-6 mass parts of calcined clay, and
c) optionally 10-250 mass parts of aggregates,
applying the mixture thus obtained to a porous construction material, and
optionally hardening the applied mixture,
wherein the Portland cement is a high early-strength Portland Cement with a Blaine surface as measured according to EN 196-6:2010 of 2,500-10,000 cm2/g.
2 . The method according to claim 1 , wherein the calcined clay is metakaolin.
3 . The method according to claim 1 , wherein the method is selected from the group consisting of a method for protection against ingress according to method 1.3 of standard EN 1504-9, a method for a moisture control according to method 2.3 of standard EN 1504-9, a method for concrete restoration according to method 3.1 or 3.3 of standard EN 1504-9, a method for structural strengthening according to method 4.4 of standard EN 1504-9, a method for increasing a physical resistance according to methods 5.1 or 5.3 of standard EN 1504-9, a method of increasing a resistance to chemicals according to method 6.3 of standard EN 1504-9, a method of preserving or restoring passivity according to methods 7.1 or 7.2 of standard EN 1504-9, a method of increasing a resistivity according to method 8.3 of standard EN 1504-9.
4 . The method according to claim 1 , wherein the method additionally comprises one or more further steps selected from removing part of the porous construction material, cleaning a surface of the porous construction material, and/or priming the surface.
5 . The method according to claim 1 , wherein the method additionally comprises an application of further layers on top of the mixture of water and a composition C.
6 . The method according to claim 1 , wherein the mixture of water and composition C is applied in a one-step procedure as one layer or in a multiple-step procedure as two or three layers to yield a total layer thickness of 0.5-50 mm.
7 . The method according to claim 1 , wherein the mixture of water and a composition C is applied by trowel, brush or roller.
8 . The method according to claim 1 , wherein the mixture of water and a composition C is applied in a spray application.
9 . A dry composition C for use in a method according to claim 1 , the dry composition C comprising:
a) 100 mass parts of Portland cement,
b) 1-6 mass parts of calcined clay, and
c) optionally 10-250 mass parts of aggregates,
wherein the Portland cement is a high early-strength Portland Cement with a Blaine surface as measured according to EN 196-6:2010 of 2,500-10,000 cm2/g.
10 . A wet composition obtained by mixing a dry composition C according to claim 1 with water in a water to powder ratio of 1:1 to 1:11.
11 . A porous construction material obtained by a method according to claim 1 .
12 . A porous construction material according to claim 11 , wherein it is part of basement walls, floor structures, drainages, pipes, silos, stairs, bathrooms, kitchens, swimming pools, balconies, terraces, ponds or basins, harbor structures or works of civil engineering.