Mortar composition
A mortar composition, in particular for preparing a viscoelastic body or structure, or for acoustic damping of at least one of a ship, an offshore installation and a building, includes: 1-20 wt % of a hydraulic binder, 30-80 wt % of aggregates, 5-75 wt % of a polymer, and 0.5-40 wt % of a porous filler.
1. A method for the acoustic damping in a ship, an offshore installation, a vehicle and/or in a building, said method comprising the steps of:
producing a structure comprising:
a shaped body comprising a mortar composition after hardening with water, the shaped body having a loss factor tan δ according to standard ISO 6721 at 0° C. and 300 Hz of at least 0.05, wherein
the hardened mortar composition of the shaped body is configured for acoustic damping of the ship, the offshore installation, the vehicle and/or the building, and
the mortar composition comprises:
3-10 wt % of a hydraulic binder,
30-80 wt % of aggregates,
25-35 wt % of a polymer, and
2-6 wt % of a porous filler, wherein
the porous filler comprises volcanic rock, and
the porous filler has a porosity of at least 25 vol % and a grain size of the porous filler is 4 mm or less; and
a support element and cover element being attached to the shaped body; wherein
the shaped body comprising the hardened mortar composition is formed by mixing the mortar composition with water, applying the mixture on a support structure and covering the mixture with a covering layer, and wherein the mortar composition is applied on a floor, on a wall, and/or on a ceiling.
2. The method according to claim 1 , wherein the polymer of the mortar composition is a water soluble or a water redispersible polymer.
3. The method according to claim 1 , wherein the polymer of the mortar composition is a homopolymer or copolymer based on one or more monomers selected from the group consisting of vinyl alcohol, acrylic acid, methacrylic acid, and methacrylate.
4. The method according to claim 1 , wherein the hydraulic binder of the mortar composition comprises alumina cement.
5. The method according to claim 1 , wherein the aggregates of the mortar composition is at least one selected from the group consisting of sand, quartz, and rubber.
6. The method according to claim 1 , wherein the shaped body is a flat layer.
7. The method according to claim 1 , wherein the loss factor tan δ according to standard ISO 6721 at 0° C. and 300 Hz is at least 0.13.
8. The method according to claim 1 , wherein the shaped body is arranged between the support element and the cover element, where the support element is a metal layer, and the cover element is formed as flat layer.
9. The method according to claim 1 , wherein the porous filler of the mortar composition is at least one selected from the group consisting of pumice and perlite.
10. The method according to claim 1 , wherein the porosity of the porous filler of the mortar composition is at least 50 vol % with respect to the total volume of the porous filler.
11. The method according to claim 10 , wherein the porosity of the porous filler of the mortar composition is at least 75 vol % with respect to the total volume of the porous filler.
12. The method according to claim 1 , wherein the grain size of the porous filler of the mortar composition is 2 mm or less.
13. The method according to claim 1 , wherein the grain size of the porous filler of the mortar composition is 1 mm or less.
14. The method according to claim 1 , wherein the polymer is selected from polyvinyl esters, polyvinyl alcohols, polymethacrylates, butylacrylates, vinylversatate or mixtures thereof.
15. The method according to claim 1 , wherein polymer is selected from polyacrylate, poly(vinyl acetate), poly(vinyl alcohol), ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer or mixtures thereof.
16. The method according to claim 1 , wherein the mortar composition is applied on the support structure at a thickness in a range of from 1-5 mm.