CS238783B1 - A method of forming a waterproofing layer on the surface of concrete pH elements by producing them using methyl methacrylate - Google Patents

Abstract

Method of creating a waterproofing layer on concrete elements during their production and using acrylate, when there is no substrate provided with a separate layer. Liquid acrylate, initiated with 0.01 to 5 % by weight of organic peroxide (dibenzoyl peroxide) and optionally 0.05 to 2.5 % by weight of organic reducing agent (benzene), is applied to the substrate by pouring or spraying. After the concrete element has been manufactured, including any reinforcement and thermal insulation layer, installation and other elements and inserts, the entire element is compacted and subjected to a thermal process to accelerate the hardening of the concrete. When initiated with organic peroxide, acetylene methacrylate polymerizes at temperatures ranging from 0 to 110 °C, when initiated with organic peroxide and organic reducing agent, acetylene methacrylate polymerizes at temperatures ranging from 50 to 80 °C. In this way, a composite layer of polyethylene methacrylate is formed in the concrete with a thickness of several mm, water-resistant up to 0.8 HPn, so that there is no need to perform additional insulation, for example, of external panels against moisture. The method according to the invention therefore saves material and reduces labor.

Description

The invention relates to a method of forming a waterproofing layer on the surface of concrete elements by forming a composite of concrete and polymethyl acetate.

Concrete in the usual sense of the word is partially absorbent, and even to salt-resistant frost and aggressive water can cause the destruction of concrete even without frost cycles. Therefore, Saeto concrete elements are insulated against the ingress of water.

Hydroinsulation usually performs strips or films of bituminous or polymeric materials in various thicknesses and combinations. The process is laborious and, for uncertain reliability, the layers are often oversized, which greatly increases costs. Also, the hydroisolacs are laboriously and costly carried out by grouting with polymer-type materials or by impregnation with monomers or oligomers, followed by initiation of polymerization by redox, thermal Si radiation.

During the impregnation, there is a considerable loss of monomer by evaporation (about 30 to 50% by weight) with a significant negative impact on the environment and the impregnated surfaces are laboriously treated by pre-drying or vacuuming.

The disadvantage of the above-mentioned disadvantages is the method of forming waterproofing layers in concrete prefabricated parts according to the invention, which comprises depositing or spraying a liquid monomer methyl methacrylate containing 0.01-5% of a proxide initiator (dibenzoyl peroxide) on a form-coated substrate. of organic type and optionally with an organic reducing agent (benzoin) content of 0.05 to 2.5% by weight, allowing to reduce the polymerization. temperature by several tens of degrees, in a layer up to 2 pm. After that, the concrete element is made including any reinforcement, thermal insulation layer and installation and other elements and inserts. The whole element is compacted and subjected to a thermal process to accelerate the setting of the concrete. In this thermal process, polymerization of methyl methacrylate takes place, resulting in a multi-millimeter waterproofing layer of the concrete-polymethyl methacrylate composite, resistant to water penetration up to a pressure of about 0.8 MPa, which is sufficiently strong and resistant. There is no need for mechanical protection.

The method of forming the waterproofing layer is explained in more detail in the following examples where percentages are by weight.

Example 1

The outer surface of the concrete slab formed in the form substrate was to be provided with a solid adhering waterproofing layer.

For this purpose, a form-pad was first prepared by cleaning and applying a release agent and sprayed onto the bottom with a mixture consisting of the following components:

methyl methacrylate 99% dibenzoyl peroxide 1%

This mixture was applied in an amount of 1.0 kg.m.

Subsequently, a concrete mix of Portland PC 400 cement 21.7%, aggregate 0 to 8 mm 65.3% water 13.0% was applied to the treated form substrate in a conventional manner and compacted by intense vibration for 5 minutes.

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In the usual Saxon schedule, the element was subjected to a process of accelerated hardening of the concrete by a thermal process at 90 ° C for 8 hours in a heat treatment chamber, after which the surface was demolded and crosslinked for several hours of technological break. Its outer layer was treated in this way to resist pressure water up to 0.8 MPa.

Example 2

The outer surface of the concrete slab formed with the formopodložca was to be provided with a firmly adhering waterproofing layer. For this purpose, the form-pad was first prepared by cleaning and depositing the release agent and sprayed onto the bottom with a mixture consisting of the following components: methyl methacrylate 99.90% dibenzoyl peroxide 0.04% benzoia 0.06% -2

This mixture was applied at a rate of 0.6 kg.m.

Subsequently, a cementitious mix of cement.portland PC-400 21.7% aggregate 0 to 8 mm 65.3% water 13.0% was applied to the treated substrate in a conventional manner and compacted by vibration for 5 minutes.

In the usual time schedule, the element was subjected to a process of accelerating the hardening of the concrete by a thermal process to 60 ° C for 6 hours in a heat treatment chamber. After several hours of technological break, the element was demolded and cleaned. Its outer layer was treated in this way to resist pressurized water up to 0.8 MPa.

This method is advantageous to use in the manufacture of concrete elements in which there is an increased demand for protection against moisture, for example elements for building basements of buildings and the like. The method is simple and easy to manufacture, simplifies construction work and saves material.

Claims (2)

Method for forming a waterproofing layer on the surface of concrete elements in the production thereof using methyl methacrylate, characterized in that liquid monomer methyl methacrylate initiated by 0.01 to 5% by weight of organic peroxide as dibenzoyl peroxide in a layer up to 2 mm is applied by pouring or spraying , DC will produce the concrete element including any reinforcement of the thermal insulation layer and installation elements and inserts, the whole element will be compacted and subjected to the thermal process to accelerate the hardening of the concrete and polymerization of methyl methacrylate. 2. A process according to claim 1, wherein 0.05 to 2.5% by weight of peroxide-initiated methyl methacrylate is added. organic reducing agents such as benzoin.