SK822021U1 - Dry mixture of cement-plastic screed - Google Patents

Abstract

The dry mixture of cement-plastic screed comprises: 18 % by weight to 24 % by weight of crushed plastic material, 20 % by weight to 26 % by weight of Portland cement, 20 % by weight to 26 % by weight of siliceous sand having fraction 0,2 to 0,8 mm, 2,7 % by weight to 3,1 % by weight of superplastificator, 2,0 % by weight to 2,7 % by weight of SiO2, gravel with fraction 0/4 in supplementary amount up to 100 %.

Description

SK 82-2021 U1

Technical field

The technical solution relates to a dry mixture of cement-plastic screed usable in construction. The technical solution belongs to the field of construction.

Prior art

At present, products based on cement, silica sand and crushed stone, granite or marble are commonly known in the field of construction and stonework, such as e.g. Now.

RU 2739910 C1 is known in the prior art, which describes a polymer-cement dry construction mixture which contains Portland cement, a polymeric binder, sand, glass fiber and a modifier. The polymeric binder is a redispersible polyvinyl acetate polymer powder or polyvinyl acetate copolymers.

Also known from CN 112063160 A is a two-component fast-setting plastic cement, where the first component is a polyether polyol, a curing agent, a surface hydroxylated modified paraffin, a thickener and a solid filler. The second component is a polyether polyol, a catalyst, a crosslinking agent, a hydroxyl surface modified paraffin, a thickener and a solid. Paraffin with a certain hydroxyl content is introduced into these two components.

There was also a tendency to mix acrylate rubber asphalt into the cement, as in the utility model SK 1692 U, in order to reduce the bulk density, increase the thermal insulation properties and ensure water impermeability.

It is also known to build a building composition comprising cement and paper pulp as described in utility model SK 4239 U, whereby savings in production costs and weight reduction of the product are achieved.

But none of these products is suitable for creating floor screeds.

The problem of cement mixtures, which has not yet been fully explored, has evoked at present the design of a cement mixture composition that would enable the ecological use and consumption of plastic waste. The result of this effort is the dry cement-plastic screed mixture described in this technical solution.

The essence of the technical solution

The mentioned problem of cement screed mixtures is solved by the proposed dry mixture of cement-plastic screed according to the technical solution. The essence of the technical solution lies in the fact that, depending on its composition, it contains crushed plastics, preferably which cannot be further recycled. It is possible to use plastics of all kinds with a fraction of 1 mm to 20 mm, possibly also a higher fraction, or chopped plastic strips, except for plastic pellets. It is also cement, e.g. Portland gray or white with a strength of 32.5 MPa to 52.5 MPa, silica sand with a fraction of 0.2 mm to 0.8 mm, powder superplasticizer with a density of 10/40 based on melamine-formaldehyde resin, gravel with a fraction of 0/4 and microsilicate SiO ₂ . This dry mixture of cement-plastic sweat can be packaged e.g. into paper bags and at the point of use it is only mixed with water.

The essence of the technical solution is complemented by the percentage of individual components of the dry mixture of cement-plastic screed. The dry mixture of cement-plastic screed contains:

- 18% by weight up to 24 wt. plastic crumb

- 20 wt. up to 26 wt. of Portland cement 32.5 CEMI

- 20 wt. up to 26 wt. silica sand with a fraction of 0.2 to 0.8 mm

- 2.7% by weight up to 3.1 wt. superplasticizer with a density of 10/40 based on melamine-formaldehyde resin

- 2.0 wt. up to 2.7 wt. of SiO _{2 microsilicate}

- gravel with fraction 0/4 in an additional amount up to 100% by weight mixtures.

The advantages of the dry cement-plastic sweat mixture according to the technical solution are obvious from its effects, which are manifested externally. The effects and originality lie in its unique composition, where the goal is to save costs by using a cheap input raw material - plastic waste, as well as reduce the weight of the final product. An indisputable benefit is the fact that the screeds of this cementitious plastic mixture look like terrazzo. Such an effect is achieved by replacing marble crumb with plastic waste crumb, which reduces costs by up to 80%. According to the technical solution, screeds made of cement-plastic mixture leave a lower carbon footprint and at the same time the problem with one of the most difficult to recycle plastic waste is solved. Decades of degraded plastic, even when exposed to sunlight, can be processed in this way. Adding plastic crumb gives the sweat its surface structure, mosaic and adding silica sand gives the screed stiffness.

SK 82-2021 U1

Examples of embodiments

It is understood that the individual embodiments of the dry cement-plastic screed mixture according to the technical solution are presented for illustration and not as limitations of the technical solutions. Those skilled in the art will find, or be able to ascertain using no more than routine experimentation, many equivalents to specific embodiments of a dry cementitious plastic screed composition according to the invention. Such equivalents will also fall within the scope of the protection claims.

It is not a problem for those skilled in the art to optimally mix the individual components of the dry cement-plastic screed mixture, so these features have not been addressed in detail.

Example

In this example of a specific embodiment of the subject of the technical solution, a dry mixture of cement-plastic screed is described. The dry mixture of cement-plastic screed contains:

22.5 kg of plastic crumb, which is 21.844 wt.

25.0 kg of Portland cement 32.5 CEMI, which is 24.27% by weight.

25.0 kg of silica sand with a fraction of 0.6 mm, which is 24.27% by weight.

3.0 kg of a superplasticizer with a density of 10/40 based on melamine-formaldehyde resin, which is 2.91% by weight.

2.5 kg of SiO ₂ microsilicate, which is 2.43% by weight.

25.0 kg of gravel with fraction 0/4, which is 24.276 wt.

Industrial applicability

The dry mixture of cement-plastic screed according to this technical solution is intended for the field of construction.

Claims (2)

SK 82-2021 U1 CLAIMS FOR PROTECTION A dry mixture of cement-plastic screed, characterized in that it contains: 18% by weight. up to 24% by weight, plastic crumb, 20% by weight up to 26 wt. of Portland cement, 20 wt. 5 to 26 wt. of silica sand with a fraction of 0.2 to 0.8 mm, 2.7 wt. up to 3.1 wt. superplasticizer, 2.0 wt. up to 2.7 wt. of microsilicate SiO ₂ , gravel with fraction 0/4 in an additional amount up to 100 wt. Dry cement-plastic screed mixture according to Claim 1, characterized in that it contains Portland cement 32.5 CEMI. A dry cementitious plastic screed mixture according to claim 1, characterized in that it contains a powder superplasticizer with a density of 10/40 based on melamine-formaldehyde resin. End of document