CS237659B1 - Methyl methacrylate building and repair material - Google Patents

Abstract

Methyl methacrylate building and repair material can be used as a building material for building individual structural elements and for repairing all traditional building materials with an open pore structure. The most effective use of this material appears to be for building and repairing road (motorway), bridge and airport pavements. A separate methyl methacrylate binder can be used for reinforcing and sealing all building materials with an open pore structure.

Description

BACKGROUND OF THE INVENTION The present invention relates to methyl methacrylate building and repair materials for building and repairing very stressed mobile structures / layers / surfaces.

One of the most stressed running structures of the surface is a bridge road (on the road). In Germany the materials based on modified liquid epoxy resins, tars or asphalts are used for building very stressed running layers.

The aim of the solution is to eliminate the expansion and protective layer and replace it with a single layer. This allows high adhesion to the substrate and also enables the mechanical properties obtained by the composition of tar or bitumen with epoxy resins. The modified Strabag materials have the following properties: pot life 1.5 hours; tensile strength at 0 ° C 3.5 MPa, at -20 ° C 22.0 MPa; tear strength of 2.2 MPa; cure at + 140 ° C for 3 hours; it is made in thicknesses over 3 mm.

However, these values have the disadvantage of changes in mechanical properties with changes in ambient temperature, long workability during heating, time needed for curing at an air temperature of +20 C to 72 hours, tear strength ensures adhesion (no anchoring), no reinforcement and sealing it is not possible to replace the entire road strata with one layer, they are usable only in the road strata, origin is in oil and the energy intensity of production causes a high price.

In the USA, pilot plant tests are carried out with methacrylate compound 2 237 659 ingestions and fires, but using other crosslinking monomers, promoters and having the following properties: compressive fracture strength up to 69.3 MPa, flexural fracture strength up to 20.5 MPa, shear peel strength up to 8.1 MPa. The curing of the composites takes place after 2 and 6 hours at ambient temperatures from + 2 ° C to + 35 ° C. The methacrylate polymer reinforcements employ trimethylolpropanetriacetate. The other components are identical to the submitted proposal except for the dimethylparatoluidine promoter, which, however, has been used in the USA from an air temperature of 43 ° C. With this mass, it is already possible to replace the adhesion by mechanical anchoring into the substrate with an open pore structure. The literature on this issue: ^ L.Kukacka, J.Pontana - ,, Polymer concrete ,, Upton

1977 and J.Fontana, L.Kukacka - ,, G-reenport Bridge Reconstruction ₍ using polymer concrete ,, Upton 19-0,

The difficulty of building structures under construction so far is the expansion of vapors and insufficient connection of individual layers of the strata.

These problems are overcome by the methyl methacrylate building and repair compound according to the invention which, when applied to a substrate with an open pore structure, achieves a high bond strength. The essence of the proposed solution is the construction methylmethacrylate and repair mass-high strength, compressive strength, in cememtobetonového anchorage in the substrate highly resistant to frost cycles and chemical rozmrazovaoím icing materials containing atmosphere at a temperature above ^about 18 * C 10.93% wt. % methyl methacrylate monomer} 0.63 wt. mono to polyethylene glycol dimethacrylate; 0.62% by weight of polymethylmethacrylate; 0.13 wt. dimethylaniline; 0.19 wt. % dibenzoyl peroxide and 87.5 wt. fillers / aggregates /. At an ambient temperature of 8 ° C, methylmethacrylate building and repair material contains 10.68 wt. methyl methacrylate monomer; 0.63% wt. mono to

- 3,237,659 polyethylene glycol dimethacrylate; 0.62 $ wt. polymethyl methacrylate; 0.13 $ w / w dimethylaniline; $ 0.32 wt. % dibenzoyl peroxide and 87.5 wt. fillers / aggregates /. In this case, it is no longer an adhesion to the substrate, but a mechanical anchoring that imparts a binder applied to the substrate which impregnates the substrate. This safely surpasses the vapor pressure of all heat-stressed surfaces / structures / and the risk of displacement / failure / of the applied cured composite relative to the substrate.

Methacrylate building and repair material is widely used in traffic construction and maintenance of all cement-concrete constructions / pavements on road bridges, wear layers on existing concrete surfaces of road or airways, repair material of all concrete load-bearing elements, etc./. Wtylmethacrylate monomer does not originate in oil, the starting material is natural gas, which we have at a low cost, and methacrylate chemistry has a long tradition of production in Czechoslovakia. It is also not possible to ignore the effect of a short cure time, which will be of priority for example for the repair of the concrete road surface.

A beam-shaped composite of 4 4.16 cm was created in the laboratory and subjected to bending and compression tests on presses. The same composite was checked on a spooler. A special apparatus was used for peeling / shearing, where a 2.5 cm thick composite layer was peeled from a 8.8 cm cement-concrete substrate. Laboratory samples of methyl methacrylate building and repair materials have the following mechanical properties: compression strength up to 71.6 MPa; bending fracture strength up to 25.07 MPa; tear strength of up to 9.0 MPa; processing time 4 - ₂₃₇ g ₅ g coa durability 30 min. and this time can be extended as required, curing time 120 min. and can be shortened if desired, processing can be carried out at ambient temperatures from 0 ° C to + 40 ° C. In 3fa NaCl solution, the weight waste was after 75 freezing cycles / -17 ° C to + 20 ° C / 45g / m ² . / For cementitious concrete surfaces, 1000 g / m ^{2 of} waste is prescribed for road surfaces after 50 defrosting cycles. Here, two potholes were repaired on a concrete pavement. A first pot with a dimension of 100. 100.2 cm was repaired at an air temperature of + 29 ° C; Road traffic was allowed to repair after 120 minutes after binder initiation.

Example of the first pothole:

Matyl methacrylate building and repair material was prepared from the following components:

10.93 fa. methyl methacrylate monomer,

0.63% wt. triethylene glycol dimethacrylate,

0.62 fa by weight, polymethyl methacrylate,

0.13 fa wt. dimethylaniline,

0.19 fa. dibenzoylperoxide,

87.50 wt. fillers / aggregates /.

Execution of the second pothole: ^z

Matyl methacrylate building and repair material was cast from the following components:

10.68% wt. methyl methacrylate monomer,

0.63 fa. % ethylene glycol dimethacrylate _f 0.62 wt. polymethyl methacrylate,

0.13 fa wt. Simetylaniline,

0.12 fa wt. bishydroxyethylparatoluidine, δ 5 0.32% by weight of dibenzoyl peroxide,

87.50 wt. fillers / aggregates /. _{237 6gg}

The quality and size of the aggregate is chosen according to the type of use of the composite. Aggregates must not have more than 2.5 moisture. The largest dimension of the grain shall not be greater than 1/3 of the smallest dimension of the composite. Depending on the voids content of the mined aggregate, the grain size curve must be adjusted so as to continuously show a content of 35 ° to 57 ° fraction 0 / i.

Mixing with filling is performed in conventional concrete mixers or manually in a container or on a "figure". The mortar is peeled onto a dry substrate, compacted and treated as required. From laying to hardening, the mortar is covered with a PE coating to prevent monomer leakage.

Claims (2)

1. Methylmethacrylate building and repair material with high compressive strength, tensile strength, anchoring in a cementitious base, Highly resistant to freezing cycles and chemical freezing screed materials, characterized in that it contains 10.6 to 11% by weight. % methyl methacrylate monomer, 0.63 wt. % mono to polyethylene glycol dimethacrylate, 0.62 wt. % polymethyl methacrylate, 0.13 wt. % dimethylaniline, 0.15 to 0.32 wt. % dibenzoyl peroxide and 87.5 wt. fillers. 2, Methyl methacrylate building and repair material according to item 1 _; characterized in that it contains 0.12 wt. bishydroxyethylparatoluidine.