SK289123B6 - Dry mixture of cement-plastic screeding - Google Patents

Abstract

Dry mixture of cement plastic screed contains: 18 % of weight to 24% of weight of plastic crumb, 20 % of weight to 26% of weight of Portland cement, 20 % of weight to 26 % of weight of silica sand with a fraction 0.2 to 0.8 mm, 2.7 % of weight to 3.1 % of weight of superplasticizer, 2.0 % of weight to 2.7 % of weight of microsilica SiO2, and gravel with a fraction 0/4 in additional quantity to 100 % of weight.

Description

The invention relates to a dry mixture of cement-plastic screed usable in construction. The invention falls into the field of construction.

Current state of the art

Currently, products based on cement, silica sand and crushed stone, granite or marble are commonly known in the field of construction and stonework, such as terrazzo.

In the state of the art, the document RU 2739910 C1 is known, in which a polymer-cement dry construction mixture is described, which contains Portland cement, a polymer binder, sand, glass fiber and a modifier. The polymer binder is a redispersible polymer powder made of polyvinyl acetate or polyvinyl acetate copolymers.

Also from the document CN 112063160 A, a two-component fast-hardening plastic cement is known, 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 polyether polyol, catalyst, cross-linking agent, paraffin modified with a surface hydroxyl group, thickener and solid substance. Paraffin with a certain hydroxyl content is introduced into these two components.

There were also tendencies to mix acrylate rubber asphalt into the cement, as it is in the utility model SK 1692 U, for the purpose of reducing the bulk weight, increasing the thermal insulation properties and ensuring waterproofness.

A construction mixture containing cement and paper pulp is also known, as described in utility model SK 4239 U, which achieves savings in production costs and a reduction in the weight of the product.

But none of the listed products is suitable for creating floor screeds.

The issue of cement mixtures, which has not been fully researched so far, evoked the idea of designing such a composition of cement mixture, which would make it possible to use and consume plastic waste in an ecological way. The result of these efforts is the dry mix cement-plastic screed described in this invention.

The essence of the invention

The mentioned problem of cement screed mixtures is solved by the proposed dry cement-plastic screed mixture according to the invention. The essence of the invention consists in the fact that, according to the 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, or even a higher fraction, or chopped plastic strips, except for plastic pellets. Furthermore, it is 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, powdered superplasticizer with a density of 10/40 based on melamine formaldehyde resin, gravel with a fraction of 0/4 and microsilicate SiO2. This dry mixture of cement-plastic screed can be packaged e.g. into paper bags and just mix it with water at the point of use.

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

- 18% wt. up to 24% wt. plastic waste,

- 20% wt. up to 26% wt. Portland cement 32.5 CEM I,

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

- 2.7% wt. 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. microsilicate SO2,

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

The advantages of the dry mixture of cement-plastic screed according to the invention 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 reducing the weight of the final product. An indisputable benefit is the fact that screeds made of this cement-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%. The screeds from the cement-plastic mixture according to the invention leave a lower carbon footprint and at the same time solve the problem of one of the most difficult to recycle plastic waste. Even decades-old degraded plastic can be processed in this way, even if exposed to sunlight. The addition of plastic crumb gives the screed its surface structure, mosaic, and the addition of silica sand gives the screed rigidity.

Examples of implementation of the invention

Individual embodiments of the dry mixture of cement-plastic screed according to the invention are presented for illustration and not as limitations of the invention. Those skilled in the art will find, or will be able to discover using no more than routine experimentation, many equivalents to specific embodiments of the dry mix cement-plastic screed of the invention. Even such equivalents will fall within the scope of protection claims.

Optimal mixing of the individual components of the dry mixture of cement-plastic screed cannot be a problem for experts familiar with the state of the art, therefore these features were not addressed in detail.

Example

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

22.5 kg of plastic waste, which is 21.844% by weight,

25.0 kg of Portland cement 32.5 CEM I, 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 superplasticizer with a density of 10/40 based on melamine formaldehyde resin, which is 2.91% by weight,

2.5 kg of microsilicate SiO2, which is 2.43% by weight. a

25.0 kg of gravel with fraction 0/4, which is 24.276% by weight.

Industrial applicability

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

Claims (3)

1. Dry mixture of cement-plastic screed, characterized by the fact that it contains: 18% by weight. up to 24% wt. plastic crumb, 20 wt.% up to 26% wt. of Portland cement, 20 wt.% 5 to 26% wt. 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. microsilicate SiO ₂ , gravel with a fraction of 0/4 in an additional amount up to 100% by weight. 2. Dry mixture of cement-plastic screed according to claim 1, characterized in that it contains Portland cement 32.5 CEM I 3. Dry mixture of cement-plastic screed according to claim 1, characterized in that 10 contains a powdered superplasticizer with a density of 10/40 based on melamine formaldehyde resin.