DE2606137A1 - Synthetic resin plastic for covering reinforcing steel in concrete - prepd. from an epoxide resin wood flour and a polysulphide - Google Patents

Abstract

Synthetic compsn. for the plastic repair of concrete and for the covering of insufficiently incorporated steel in the concrete. The compsn. is based on conventional epoxide resins, hardeners and the addn. of polysulphides to make the plastic sufficiently flexible. Wood flour or synthetic powder is used as a filler in place of the normal mineral filler to make the hardened plastic workable similarly to wood. The flexible compsn. which absorbs motion in the concrete without breaking down.

Description

Patent name Kunstharzplastic for the covering of the reinforcing steel State of the art in concrete: Breakouts and holes in the concrete often lay the reinforcing steel free or it is not covered enough. Also a per se according to DIN 1o45 Too little coverage of the steel by concrete is a technical defect. The Steel is exposed to rust in these cases.

The new covering then takes place after an active anti-rust coating of the exposed and rust-free steel either with cement-bound mortars or with suitable plastic mortars based on epoxy resins, polyester resins and acrylic resp. Methacrylic resins.

These synthetic resin concretes then cover the steel in a protective manner.

The disadvantage of all these mineral or synthetic resin coverings is their coefficient of linear expansion, which differs from that of concrete associated with the rigidity of the mending material. This leads to the cement-based patch mortars almost regularly break off and after some time Cracks in the repair, also in the synthetic resin concrete or mortar very often.

Subject of the invention and description It is necessary to make this plastic Covering and edge repairs to be made with a material that has inherent flexibility and is able to absorb the stresses that occur without damage that there are tears or tears as a result of differences in movement.

The synthetic resin plastic mass described here is Resin plastic for covering the reinforcing steel in concrete on the basis of conventional ones Made up of epoxy resins and softer and flexible thanks to the addition of polysulphides been made. This plastic is capable of harmless movements in the concrete part without damaging the repair.

The mending compound is additionally made with fine wood flour or also Plastic powder filled so that they can be grinded and drilled in the hardened state and how wood becomes easily machinable, so that the structure of the surrounding concrete can be achieved with simple tools.

The joint curing of epoxy resin and polysulphide is not New. This creates a thioether bond with an ethyl group in position. These Mixture has hardly been used at all so far, at most to make it more flexible of epoxy resin coatings and primers.

The use of this connection is new - it is to a lesser extent flexible made epoxy resin plastic to protect the insufficiently covered steel in the concrete and for the plastic renewal of concrete excavations. The possibility of such imperfections Technically safe repairing has a considerable, technical and economic point of view Meaning.

Synthetic resin plastic fu: the covering of the reinforcing steel in the concrete Application example epoxy resin based on bisphenol A including reactive Thinner 37 parts hardener based on amine adducts 35 parts ground joint powder 20 parts polysulphide liquid 7 parts Aerosil 1 part loo parts

Claims (1)

Patent claim plastic compound for the plastic renewal of concrete and to cover insufficiently incorporated steel in concrete on the basis of conventional epoxy resins, hardeners for epoxy resins and the addition of polysulphides to make the plastic sufficiently flexible. Use wood flour or plastic powder for filling in place the usual mineral fillers to make the plastic later workable like wood close