DK1983120T3

DK1983120T3 - joint sealing element

Info

Publication number: DK1983120T3
Application number: DK08007618.5T
Authority: DK
Inventors: Kogel Andreas; Claus Steinbuch
Original assignee: Stekox Gmbh
Priority date: 2007-04-20
Filing date: 2008-04-18
Publication date: 2016-10-03
Also published as: EP1983120A2; EP1983120A3; EP1983120B1

Description

The invention relates to the utilisation of a support member as a joint sealing element for sealing a construction joint formed between two concreting sections.

When buildings are being constructed and two consecutive concreting sections are made, this will lead to the creation of what is generally referred to as construction joints. Such construction joints entail the risk of not being reliably tight over the life-cycle of a building, such that water ingress into a building may take place along such a construction joint. The sealing of such construction joints, and thus the realisation of water-tight concrete constructions, is achieved by permanently sealing these construction joints through the insertion of joint sealing elements or metal joint sheets. These form a barrier against the ingress of water and humidity, thus ensuring an effective sealing.

For increasing the sealing effect, a metal joint sheet is disclosed in DE297 10 007 U1, for example, which comprises a strip-shaped coating made of water-swellable polymer material. The swelling of the water-swellable polymer material, once the concrete has been poured, is to be retarded for a given amount of time, until the hardening of the concrete is sufficiently advanced. Such metal joint sheets are intended to seal cracks in the construction joint through the swelling of the polymer material. DE 20 2004 003 189 U1 further discloses a metal joint sheet in which a coating having a sealing material is applied to a galvanised support sheet. This sealing material consists of concrete and/or calcium hydroxide. A plastic dispersion is provided as a bonding agent for ensuring the reception of concrete and/or calcium hydroxide. The sealing effect is to be achieved by the fact that when the concrete and/or the calcium hydroxide present on the support sheet come(s) into contact with water during the concreting operation, they/it undergo(es) a crystallisation process that leads to the formation of water-insoluble calcium carbonate. Crystallisation is thus supposed to fill the cracks. The sealing effect here depends on the formation of the water-insoluble calcium carbonate which, in turn, depends on the incorporation of the sealing material into the bonding agent on the support.

From DE 22 39 665 A1, which discloses a utilisation of a support member in accordance with the preamble of claim 1, a sealant is known that is applied on a web-shaped or foliate support. This adhesive paste contains a thermoplastic, synthetic base polymer, a compatible tackifying resin, and a filler. On one side of the adhesive paste, a peelable protective layer is applied. DE 203 11 693 U1 discloses a sealing tape comprising a base strip formed from a cold-formable knitted fabric made of synthetic and natural fibres and a moisture-repellent coating made of an uncured and/or partly cross-linked elastomer that is applied onto the base strip. DE 203 01 471 U1 discloses a metal joint sheet having a sealant coating that is provided with a protective cover. Once the metal joint sheet has been installed, the protective cover will at least partially disintegrate, such that the moisture, which then comes into contact with the sealant coating, causes the swelling of the coating which consists of bentonite.

It is accordingly an object of the invention to further develop a support member in such a manner that a joint sealing element is formed which ensures a reliable and durable sealing of construction joints.

This object is achieved according to the invention by the characteristics of claim 1. A very simple construction design is made possible according to the present invention by the utilisation of the support member as a joint sealing element comprising an adherent polymer layer and a protective film, with said polymer layer being realised as an adhesive film consisting of a UV cross-linked polymer. Thus, a support member of this type may be fabricated in a cost-effective manner. Realising the adherent polymer layer as an adhesive film has the additional advantage that the polymer layer is fabricated in its entirety from a tacky material and is realised as an elastic film having relatively high ductility and very good adhesion properties. An adhesive film of this type may be formed and applied by spraying, laminating, rolling or any other, similar method. Thus, it may be applied to the support member in a simple manner and, on the other hand, a very good, complete, and durable sealing effect with respect to the adjoining concrete surface may be achieved. Furthermore, this adherent polymer layer forming an elastic film has a certain elasticity such that stress relief may occur between the support member and the adjoining concrete surface, leading to an additional increase in the sealing effect. In addition, this polymer layer made of a UV cross-linked polymer forms a polymer layer, in particular an adherent polymer layer, that is elastic, on the one hand, and ageing-resistant, on the other.

Preferably configured as a joint sealing element having an adherent polymer layer that is provided with acid reactive groups suitable for being connected, via a chemical bond, with at least one concrete surface located adjacent to the polymer layer, the support member is apt to achieve an accomplished and durable sealing effect within the construction joint. Through the presence of the acid reactive groups on the polymer layer, adhesion is achieved, during the pouring of a concreting section, at least between the concrete surface abutting the polymer layer and the surface adjoining said polymer layer. In this way, it is possible to cause a water-repellent compound to be formed at least at the interface region between the polymer layer and the concrete surface located adjacent thereto. In addition, an at least partially elastic connection may be formed by the adhesion between the polymer layer and the adjacent concrete surface.

According to a preferred configuration of the invention, provision is made for the polymer layer to be enriched with reactive carboxyl groups. During the curing process of the concrete, an interaction is thus achieved between the concrete, or between the surface of the concrete, and the polymer layer, a connection between the polymer layer and the adjacent concrete surface being favoured by the forming of ester groups.

In addition, provision is preferably made for the adherent polymer layer to be fabricated on a polyacrylate base. In this way, it is possible to create a particularly suitable configuration for a polymer layer that is provided with an adherent or tacky surface on both sides of the polymer layer.

In addition, provision is preferably made for the polymer layer to have a thickness of between 0.1 mm and 2 mm. Preferably, provision is made for the thickness to be in a range between 0.5 mm and 1.2 mm. Such thicknesses permit a low installation height, on the one hand, while ensuring good adhesion properties both onto the support member and the concrete, on the other. At the same time, such thicknesses comply with heat ageing requirements. For example, no reduction in the tackiness of such a polymer layer is observed when it is exposed to heat ageing for a duration of seven days at a temperature of 70 °C.

According to another preferred configuration, provision is made for the adherent polymer layer to be insoluble in water and in an alkaline medium. In this way, it is possible to create very good and durable sealings.

Furthermore, provision is preferably made for the adherent polymer layer to be free of butyl or free of butyl containing bitumen. This may allow an unproblematic disposal. In addition, the polymer layer has the advantage of being free from any toxic properties.

According to a further preferred configuration of the invention, provision is made for the adherent polymer layer to be workable at temperatures of less than 5 °C. In particular, the adhesive film may be easily workable within a temperature range of between minus 20 °C and plus 5° C. This is required in order to properly interconnect the individual segments of the joint sealing elements with each other along a concreting section. This makes it possible for a tight junction in which two adjacent joint sealing elements overlap each other to be created by bonding without preheating. Joint sealing elements having a coating made of butyl or butyl containing bitumen need to be heated using a burner flame when worked at temperatures below 5 °C.

According to a further alternative configuration of the adherent polymer layer, provision is made for the polymer layer to be fabricated from an expanded adhesive. This makes it possible for the adhesive itself to have an expanded core and a tacky outer surface.

The support member which is used as a joint sealing element preferably has a peelable protective film provided on the adherent polymer layer and formed in two parts. In most cases, the joint sealing elements are inserted in a vertically oriented condition on a reinforcement for a base plate in order to ensure the sealing of a first concreting section. A first strip provided on the protective film is peeled off in order to enable a connection of the concrete surface of the first concreting section which is located adjacent to the joint sealing element. The other strip of the protective film will only be peeled off when the second concreting section is added, for example a side wall that is to be placed on said base plate. The protective film is formed of a material having a high degree of tear resistance, thus allowing the strips to be peeled off easily and completely, in particular in a quick manner.

According to a further preferred configuration of the invention, provision is made for the protective film to be siliconised at least on the side facing the adhesive layer or the adherent polymer layer. This makes it possible, on the one hand, to protect the surface of the adhesive film that will come into contact with the concrete surface once the pouring of the concreting section has been accomplished. On the other hand, is may easily be peeled off from the joint sealing element without damaging the adhesive film or the adherent polymer layer.

The support member that is to be used as a joint sealing element preferably consists of an untreated metallic material such as sheet steel, a plastic profile, a mineral material, in particular fibre cement. Alternatively, galvanised sheet steels or the like may be used.

The invention, as well as other advantageous embodiments and developments thereof, will be described and explained in the following with reference being made to the examples shown in the drawings. The characteristics issuing from the description and the drawings may be applied according to the present invention either individually or as a plurality of features taken in any combination. In the drawings:

Fig. 1 is a schematic sectional view of a joint sealing element disposed in a construction joint, and

Fig. 2 is a schematic side view of the joint sealing element.

In Fig. 1, a joint sealing element 11 is disposed in the region of a construction joint 12. Prior to pouring the concrete, the joint sealing element 11 is fixed on a reinforcement 14. Preferably, the joint sealing element 11 is disposed between a starter reinforcement 16 which is connected with the reinforcement 14 by a tie wire. After the positioning of the joint sealing element 11, a base plate is poured, for example, so as to form a first concreting section 17. After the concrete forming the first concreting section 17 has at least partially set, the second concreting section 18 is poured, for example in the form of a wall. The joint sealing element 11 seals the construction joint 12 formed between the first and second concrete sections 17, 18.

The joint sealing element 11, the structure of which is represented in Fig. 2, comprises a tape-shaped or strip-shaped support member 19. This support member 19 is made, for example, of metal, plastic, a woven fabric or a knitted fabric, or of a composite material consisting of plastic and/or metal and/or a textile material and/or a mineral material and/or wood. On at least one lateral surface of the support member 19, a coating 20 is provided as a strip along the longitudinal direction of the support member 19. This coating 20 extends at least partially, and preferably in its entirety, across the entire width of the support member 19, or across the entire height of the support member 19. The coating 20 consists of a polymer layer that is preferably adherent on both sides, such that this polymer layer has one of its side surfaces adhered to the side surface of the support member 19. The opposite side surface is provided with a peelable protective film 21. The protective film 21 is preferably made of HDPE and has a thickness of between 50 pm and 400 pm, preferably between 100 pm and 150 pm. At least the side facing towards the protective film 21 is siliconised, so that the latter will peel off easily. This protective film 21 is preferably formed in two parts and has in particular two strips of equal widths, such that once the joint sealing element 11 has been placed onto the reinforcement 14, first the lower part of the protective film is peeled off, thus permitting the first concreting section 17 to be inserted. During the pouring of the first concreting section 17, a water-tight connection is being created due to the configuration of the adherent polymer layer according to the present invention. In particular, with a polymer layer having acid reactive groups or acid reactive residues, an interaction via the hydrogen bridge bonds is achieved, such that a bond between the polymer layer and the adjacent concrete, or at least the adjacent concrete surface, is caused to be created via an ester group. This bond is achieved, in particular, with an acrylate-based polymer layer, the by-product of this bond being water, which does not negatively affect the curing of the concrete. The acrylate-based polymer layer may comprise reactive carboxyl groups. By means of at least this permanent chemical bond between the polymer layer and the adjacent concrete surface, it is possible to create a permanent and water-tight connection therebetween. Swelling of the polymer layer does not occur, as the polymer layer and the adjacent concrete surface are connected in a water-repellent manner.

The polymer layer has preferably a thickness of between 0.1 mm and 2 mm, in particular between 0.5 mm and 1.2 mm. At the same time, the polymer layer is somewhat elastic, such that stress relief may occur between the support member 19 and the adjacent concrete surface after the curing of the concrete. According to a preferred embodiment, the adherent polymer layer is realised as an adhesive film. For example, the adhesive film may compensate dilatations ranging from between 0.1 mm and 0.4 mm, with maximum forces of adhesion being achieved in particular within this range. Thus, if tensions should occur in this region, the adhesive film is capable of both staying adhered to the support member 19, on the one hand, and still adhering to the adjacent concrete surface, on the other. The adhesive film has, for example, a tensile bond strength with respect to the support element 19 which may vary within in a range of between 0.18 N/mm2 and 0.3 N/mm2. The tensile bond strength of the coating with respect to the concrete may, for example, be within a range of between 0.25 N/mm2 and 0.4 N/mm2. The tensile bond strength values were achieved for an adhesive film having a polyacrylate-based adherent polymer layer with a film thickness of 0.8 mm, for example. Alternatively, provision may furthermore be made for the adherent polymer layer to be formed from an expanded adhesive material, such that the entire expanded adhesive is tacky and has an adherent surface.

According to a preferred embodiment, this adherent polymer layer may be applied directly onto the support member 19 as a tape/web material by activating both the support member 19 and the polymer layer with the same web speed and by having them pass between two pressure rollers. The polymer layer may be supplied as a tape/web material on a supply roll. The same is true, by analogy, of the support member 19. Preferably, the polymer layer is on one side provided with a protective film which is siliconised on both sides, such that the adhesive film may easily be unrolled and adhered to the support member 19. Said polymer layer may further be applied by spraying, laminating, rolling or the like.

According to a further alternative embodiment of the invention, provision may be made for a granular material such as, for example, blast furnace slag, quartz sand, silicon carbide, particles of glass, ceramic, porcelain or metal, to be spread over, or partially introduced into, said polymer layer. Thus, an increased grouting effect between the concrete surface and the joint sealing element 11 may be achieved. Provision is preferably made, when additional granular material is applied, for this granular material to be placed in a central region over the height of a joint sealing element. Towards the edge regions, the proportion of the granular material diminishes gradually, leaving an outer edge strip which is exclusively formed of the adherent polymer layer so as to achieve proper sealing against the concrete surface.

Claims

Use of a support (19) which is thin-walled and in the form of a strip and at least along a side surface of the support (19) and in the width of the support (19) at least sectionally having a coating (20). of an adhesive polymer layer applied to the support member (19) and the opposite side of which is covered with a protective film (21), characterized in that the adhesive polymer layer is formed as an adhesive film and consists of a UV cross-linked polymer, and that the support member (19) is formed as a joint seal member (11) for sealing a working joint (12) formed between two casting sections (17, 18), which is embedded in the casting sections (17, 18).

Use of a support element according to claim 1, characterized in that the adhesive polymer layer comprises acidic, reactive groups suitable for joining with a concrete surface of the casting sections (17, 18) adjacent to it, at least via a chemical compound.

Use of a carrier according to claim 1 or 2, characterized in that the adhesive polymer layer is enriched with reactive carboxyl groups.

Use of a carrier according to claim 1 or 2, characterized in that the adhesive polymer layer is made on a polyacrylate basis.

Use of a support element according to one of the preceding claims, characterized in that the adhesive polymer layer has a thickness of 0.1 mm to 2 mm.

Use of a carrier according to one of the preceding claims, characterized in that the adhesive polymer layer is insoluble in water and in an alkaline medium.

Use of a carrier according to one of the preceding claims, characterized in that the adhesive polymer layer is free of butyl or free of butyl with bitumen.

Use of a carrier according to one of the preceding claims, characterized in that the adhesive polymer layer can be processed at a temperature range of less than 5 ° C.

Use of a support element according to one of claims 1 to 8, characterized in that the adhesive polymer layer has a foamed core made of an adhesive material.

Use of a support element according to one of the preceding claims, characterized in that a protective film (21) which can be peeled off into two pieces having a high tear strength is applied to the adhesive polymer layer.

Use of a carrier according to one of the preceding claims, characterized in that the protective film (21) on the side facing the adhesive film (21) has a siliconized surface.

Use of a support element according to one of the preceding claims, characterized in that the support element (19) consists of an untreated metallic material, in particular steel plate, or of a plastic material or of a mineral support material.