Leveling and noise reducing mortar composition

1. A mortar composition, comprising:

a) 3-45 wt. % of a hydraulic binder,

b) 15-80 wt. % of lightweight aggregates comprising at least two different types of particles, the at least two different types of particles including a first type of particles having a particle size in a range of 0.01 mm to 0.5 mm, and a second type of particles having a particle size in a range of 0.6 mm to 2 mm, both the first type of particles and the second type of particles being rubber particles, and

c) 5-50 wt. % of a polymer.

2. The mortar composition according to claim 1 , wherein the hydraulic binder comprises:

3-18 wt. % of aluminate cement and/or sulphoaluminate cement;

wherein all amounts are with respect to a total weight of the mortar composition in dry state.

3. The mortar composition according to claim 1 , wherein the hydraulic binder comprises aluminate cement and/or sulphoaluminate cement and latent hydraulic and/or pozzolanic binder materials with a weight ratio of aluminate cement and/or sulphoaluminate cement to the latent hydraulic and/or pozzolanic binder materials in a range from 0.5-3.

4. The mortar composition according to claim 1 , wherein a particle density of the lightweight aggregates is in a range from 100-2,000 kg/m 3 .

5. The mortar composition according to claim 1 , wherein a weight ratio of the first type of particles having a smaller particle size to the second type of particles having a larger particle size is in a range from 1:2-8:1.

6. The mortar composition according to claim 1 , wherein the lightweight aggregates or particles have a non-spherical or irregular shape.

7. The mortar composition according to claim 1 , wherein the polymer is a water soluble or water redispersible polymer, and/or wherein the polymer has a glass transition temperature in a range of −45-10° C.

8. The mortar composition according to claim 1 , comprising:

3-18 wt. % of calcium aluminate cement and/or sulphoaluminate cement;

30-80 wt. % of rubber particles, wherein a weight ratio of the first type of particles having a smaller particle size to the second type of particles having a larger particle is in a range from 2:1-4:1;

1-15 wt. % of porous inorganic particles, with a particle size in a range of 0.1-0.6 mm;

5-20 wt. % of a water soluble or water redispersible polymer; and

0-10 wt. % of one or more additives;

wherein all amounts are with respect to a total weight of the mortar composition in dry state.

9. A kit-of-parts comprising (i) the mortar composition according to claim 1 , and (ii) an adhesive composition, wherein the adhesive composition comprises:

a) 10-50 wt. % of a hydraulic binder,

b) 20-60 wt. % of lightweight aggregates, and

c) 10-25 wt. % of a polymer; and

wherein the mortar composition is chemically different from the adhesive composition.

10. A structure comprising:

a substrate;

a first layer of the mortar composition according to claim 1 ,

a second layer, comprising a adhesive composition comprising:

a) 10-50 wt. % of a hydraulic binder,

b) 20-60 wt. % of lightweight aggregates, and

c) 10-25 wt. % of a polymer; and

a cover element that is fixed to the first layer with the adhesive composition of the second layer.

11. The structure according to claim 10 , wherein a thickness of the first layer is larger than a thickness of the second layer, and a ratio of the thickness of the first layer to the thickness of the second layer is in a range from 1.1-10.

12. A method of using the mortar composition according to claim 1 , comprising:

fixing tiles on a substrate with the mortar composition.

13. A method of using the mortar composition according to claim 1 , comprising:

performing acoustic damping, noise reduction and/or vibration reduction on a substrate with the mortar composition.